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Available online at: www.mbai.org.in doi:10.6024/jmbai.2020.62.2.2250-05 Biodiversity of sponges (Phylum: Porifera) off Tuticorin, India M. S. Varsha1,4 , L. Ranjith2, Molly Varghese1, K. K. Joshi1*, M. Sethulakshmi1, A. Reshma Prasad1, Thobias P. Antony1, M.S. Parvathy1, N. Jesuraj2, P. Muthukrishnan2, I. Ravindren2, A. Paulpondi2, K. P. Kanthan2, M. Karuppuswami2, Madhumita Biswas3 and A. Gopalakrishnan1 ICAR-Central Marine Fisheries Research Institute, Kochi-682018, Kerala, India. Regional Station of ICAR-CMFRI, Tuticorin-628 001, Tamil Nadu, India. 3 Ministry of Environment Forest and Climate Change, New Delhi-110003, India. 4 Cochin University of Science and Technology, Kochi-682022, India. 1 2 *Correspondence e-mail: joshyguru@gmail.com Received: 10 Nov 2020 Accepted: 18 Dec 2020 Published: 30 Dec 2020 Abstract The present study deals with 18 new records of sponges found at Kayalpatnam area and a checklist of sponges reported off Tuticorin in the Gulf of Mannar. The new records are Aiolochoria crassa, Axinella damicornis, Clathria (Clathria) prolifera, Clathrina sororcula, Clathrina sinusarabica, Clathrina coriacea, Cliona delitrix, Colospongia auris, Crella incrustans, Crambe crambe, Hyattella pertusa, Plakortis simplex, Petrosia (Petrosia) ficiformis, Phorbas plumosus, Spheciospongia vesparium, Spirastrella cunctatrix, Xestospongia muta and Sycon ciliatum. Details about the species diversity of common sponges, invasive sponges,massive sponges and boring sponges of the area are discussed and presented. Keywords: Marine sponges, Demospongiae, boring sponges, coral Islands Introduction Gulf of Mannar (GOM) is known for its rich biodiversity of fauna and flora and a source of inspiration for research and innovation. Gulf of Mannar Biosphere Reserve (GOMBR) with an area of 2 10500 km have 21 coral islands and seven of them occur in J. Mar. Biol. Ass. India, 62 (2) July- December2020 Original Article the Vaippar - Tuticorin area. Tuticorin area is characterized by the presence of hard rocky bottom, soft muddy bottom, lagoon and lakes. Thiruchendur to Tuticorin region of GOM-up to a distance of 25 nautical miles from shore 8-10 m depth zone-is characterized by a narrow belt of submerged dead coral blocks which serves as a very good substrate for sponges. Patches of coral ground “Paar” in the 10-23 m depth zone, available in an area of 10-16 nautical miles from land are pearl oyster beds (Mahadevan and Nayar, 1967; Nayar and Mahadevan, 1987) which also forms a good habitat for sponges. First detailed report of the fauna of Pearl oyster beds of Tuticorin area was made by Hornell (1922). The first extensive collection from Tuticorin area was made by Prof. Herdman in 1902 which was later published by Dendy (1905). Relationship between the pearl oyster beds and sponge fauna have been reported in earlier works (Herdman, 1903-1906; Hornell, 1905, 1922; Mahadevan and Nayar 1967, 1974; Nayar and Mahadevan, 1964, 1987). The sponges of Tuticorin have been considered to be the most diverse and abundant group due to the presence of unique ecological characteristics of the coast (Thomas, 1971; 1986). A characteristic feature noted by him was the dense growth of sponges in the rocky bottom and associated sand bottom. He reported several new species to science with detailed systematic account and remains as Biodiversity of sponges off Tuticorin a monumental contribution to the spongiology of Gulf of Mannar. Thomas (1979) presented a systematic account of 32 boring sponges belonging to three orders, four families and 13 genera from the coral reefs of the Gulf of Mannar Ecosystem. Since the inception of the Marine Biodiversity Division of the ICAR-Central Marine Fisheries Research Institute, several research programmes were taken up to fill the gaps in the Taxonomy of the important groups of the marine organism. In this context the present exploration and taxonomic work on the diversity, distribution pattern, habitat interactions of the sponges occurring along the coral reef ecosystems, pearl oyster beds and coastal areas was taken up along the Tuticorin coast of the Gulf of Mannar area. It forms the part of the All India Coordinated Project on Taxonomy (AICOPTAX), a new initiative from the Ministry of Environment, Forests and Climate Change, New Delhi to create the data base on the inventories of the faunal diversity of India. Material and methods Sponge samples were collected from Vaippar-Manappad area of the Tuticorin in Gulf of Mannar during the period from September 2018 to May 2019. Sampling localities The following localities (Fig. 1) were selected for sample collection: Periathalai (8°18’20.53” N & 77°58’58.80” E): Periathalai is a coastal fishing village situated 53 km from Thirunalveli. The bottom is sandy nearby the coast, rocky and muddy at a depth of 5-12 m. The Sponge samples landed were from Ovari Anthoniar kovil vallai velai paar pearl oyster bed. Six sponge specimens were collected from the area during the field trip on 21.05.2019 (PR1 - PR6) and preserved. Manappad (8°22’6.36” N & 78°05’41.09” E): Manappad is 60 km away from Tuticorin and is a fishing village of ancient history. The rocky shore of Manapad inhabitate high biodiversity and abundant growth of sponges. A total of 11 sponge samples were collected from Manappad periya paar Pearl Oyster bed on 21.05.2019 (MP1 - MP11) and preserved. Kulasekharapatnam (8°24’33.31” N & 78°04’30.61” E): Kulasekharapatnam is an ancient port and now serves as a fish landing centre. The bottom is sandy but near shore is rocky with a depth range of 5-12 m. The Sponge samples landed were from Paracherry paar pearl oyster bed. A total of 11 sponge samples were collected on 21.05.2019 (KU1 - KU11) and preserved. Alanthalai (8°28’57.75” N & 78°8’21.71” E): Alanthalai is 4 km away from Thiruchandhur and, it is a coastal fishing village. © Marine Biological Association of India In ancient times Alanthalai was famous for pearl fishery. Two pearl oyster beds Semma pathu paar and Alanthalai pathoor at a depth of 8 m form a suitable habitat for sponges. A total of 11 sponge specimens were collected from the area during field trips on 01.12.2018 (AL1 - AL7) and 21.05.2019 (AL8 AL11) and analysed. Veerapandiyapatnam (8°31’17.22” N & 78°8’29.27” E): Veerapandiyapatnam is a coastal village near Thiruchandhur and an important fish landing center. The bottom is sandy and muddy and support sponge fauna. The sponge samples collected were from Thundu paar pearl oyster bed. Seven sponge samples were collected from the area during field trip on 20.05.2019 (VE1 - VE7) and analysed. Kayalpatnam (8°34’27.36” N & 78°9’15.81” E): Kayalpatnam is an ancient town which was referred in Marco Polo’s travel diaries dating to 1250 A D. It is 30 km away from Tuticorin and was an ancient port. The bottom is rocky, sandy and muddy. Three pearl oyster beds (paars) support the heavy growth of sponges in this area. The gill nets and modified gill nets operating here, bring considerable quantity of mollusks and sponges as by-catch. The sponges collected from this area were from Pearl oyster beds Kilathi paar, Kandiyan paar and Kanawa paar. A total of 39 sponge specimens were collected during field surveys conducted on 01.12.2018 (KP1 - KP9, KPI1 - KPI8, KPII1 - KPII2) and 22.05.2019 (KP10 - KP29) and analysed. Tuticorin Harbour (8° 43’ 4.85 N & 78°11’46.59” E): Harbour beach is around 8 km from Tuticorin town and it serves dual-purpose such as landing of Gill net and shore seine from morning up to 1 p.m. and from 4 p.m. onward beach tourism kicks in at the same place. The sponges collected from this area were caught from Hare coral island and pearl oyster beds such as Thundu Paar, Kanna tivu and Arupagam paar by the gill netters operating at a depth of 5-10 m. A total of 8 sponge samples were collected on 10.09.2018 (HB1- HB7) and 18.05.2019 (HB8), specimens were preserved and analysed. Hare Island (8°47’ 19.58” N & 78°14’ 12.80” E): Hare Island is 9 km away from Tuticorin town and near to the Tuticorin Port. Island is a part of Gulf of Mannar National Park with an area of 1.29 km2. The bottom is sandy with numerous shells and abundant growth of sea grass. Sponge sample was collected from the area on 07.09.2018 it was then labelled (HI1) and preserved. Inico Nagar (8°47’22.16” N & 78°10’5.93” E): Inico Nagar is a fish landing center of Tuticorin for gillnetters and disco, they operate at a depth of 5-8 m in the coral and sandy habitats. The 41 M. S. Varsha et al. Fig. 1. Sampling stations of the Tuticorin area during 2018-2019. sponges collected from this area were from Vann Coral Island and Kilathi paar Pearl oyster bed. Four samples of sponges were collected from the location during field survey on 29.11.2018 (IN1 - IN4) and analysed. along with Pearl oyster bed in Tuticorin kuda paar. A total of 72 sponge specimens were collected during field surveys conducted on 28.11.2018 (VP1 - VP13) and 20.05.2019 (VP14- VP72) and analysed. Mottagopuram (8°49’39.38” N & 78°12’32.77”E): Mottagopuram is located 5 km away from Tuticorin town and is an ancient fishing village. The special fishing gears Thallumadi (mini trawl) and Karavalai operates in 3- 4 km from the shore within a depth of 5 m. The sea grass beds nearby the coral Island and the rocky habitat of pearl oyster beds forms a very good ecosystem for sponges. The sponge samples collected from the area were from Vann coral Island and Paduthamarikan thundu paar pearl oyster bed. A total of 30 sponge samples were collected from the locations and preserved during field surveys on 14.09.2018 (MG1- MG5) and 20.05.2019 (MG6 - MG30) and analysed. Tharuvaikulam (8°54’8.98” N & 78°12’ 37.33” E): Tharuvaikulam is a small fishing village practicing gill net fisheries, located 10 km away from Tuticorin. The sponges collected from this area were mainly from Koswari coral Island and Pearl oyster beds of Cruxian paar and Devi paar. Sponges occur at a depth range of 8-12 m. Modified gill nets of different types lands sponges and mollusks as by-catch. Five sponge specimens were collected and preserved from the area during field survey on 14.09.2018 (TK1 - TK5). Vellappatti (8°51’25.46” N & 78°10’40.86” E): Vellappatti is a traditional fishing village, which is about 35 km away from Tuticorin. The coastal area nearby Vellapatti is mainly rocky and sandy bottom with the presence of varieties of sponges. Fishing takes place mainly outside the reef areas. Crab net and Mayavalai for perches bring sponges and mollusks as a by-catch. The sponges collected from this area were mainly from Koswari coral Island and Vann Island 42 Pattanamaruthur (8°56’24.10” N & 78°14’11.09” E): Pattanamaruthur is a village panchayat located in the Tuticorin district of Tamil-Nadu. It is located 24 km away from Tuticorin. The sampling area consisted of two coral islands Kariyachalli and Koswari with rocky and sandy bottom with rich sea grass bed and Pearl Oyster bed Devi paar which provides optimum conditions for sponge growth. The area of fishing is up to 15 km from the shore mainly outside the islands. The gill nets and crab nets bring sponges and molluscs as bycatch. A total of 17 sponge specimens were collected during field surveys conducted on 20.05.2019 (PT1 - PT17) and preserved. Journal of the Marine Biological Association of India Vol. 62, No.2, July-December 2020 Biodiversity of sponges off Tuticorin Sippikulam (8°59’40.13” N & 78°15’12.39” E): Sippikulam is 40 km away from Tuticorin where the Vaipaar River joins the Bay of Bengal. The bottom is mainly sandy with the presence of abundant molluscan fauna. The samples collected were from Kariyachalli coral island and Paduthamarikan thundu paar pearl oyster bed which forms good habitat for sponges at a depth of 12m. A total of 9 sponge specimens were collected from the area during field trip on 20.05.2019 (SP1 - SP9) and analysed. Collection and identification Sponges were collected by handpicking, snorkeling and SCUBA diving at various localities at a depth of 0-50 m. Visual observation of the sponge species was done and in situ photographs were taken. The collected samples were brought to the laboratory and preserved. During September 2018 and May 2019, a total of 231 sponge samples were collected from the shore as well as Sea. The sponges entangled in gill nets were also collected and preserved. The sponges were identified as per the detailed diagnostic characters given in past literature (Lendenfeld, 1889; Bergquist, 1980; Cook and Bergquist, 2002; Hooper and Van Soest, 2002). Details of the distribution and systematic status of sponges were referred from the World Porifera Database (Van Soest et al., 2020). A checklist of sponges reported from Tuticorin area was prepared and presented. Results and discussion Checklist of species A list of 114 species of sponges was consolidated during the study from the present collection and past records (Table 1). The checklist comprises 113 species of siliceous (Class Demospongia) and one calcareous (Class Calcarea) sponge representing 65 genera, 37 families and 16 orders. During the documentation of the list, review of the old names and several systematics and nomenclature modifications of the past names were done to get a uniform checklist of the species. The past studies along the Tuticorin coast revealed the presence of about 94 species along the coast (Dendy, 1905; Hornell, 1905; Nayar and Mahadevan, 1964, 1987; Mahadevan and Nayar, 1967, 1974; Thomas, 1986; Anita and Lazarus, 2006). The list includes 18 new records from the Tuticorin coast of Gulf of Mannar. The new records are Aiolochoria crassa, Axinella damicornis, Clathria (Clathria) prolifera, Clathrina sororcula, Clathrina sinusarabica, Clathrina coriacea, Cliona delitrix, Colospongia auris, Crella incrustans, Crambe crambe, Hyattella pertusa, Plakortis simplex, Petrosia (Petrosia) ficiformis, Phorbas plumosus, Spheciospongia vesparium, Spirastrella cunctatrix, Sycon ciliatum and Xestospongia muta (Table 1). Family wise list and other details of new records of species observed during the present study are given below. © Marine Biological Association of India Family Aplysinidae Carter, 1875 1. Aiolochroia crassa (Hyatt, 1875) (Plate I, Fig.1) Systematics Class: Demospongiae Sollas, 1885 Order: Verongiida Bergquist, 1978 Family: Aplysinidae Carter, 1875a Genus: Aiolochroia Wiedenmayer, 1977 Species: Aiolochroia crassa (Hyatt, 1875) Type species: Dendrospongia crassa: Hyatt, 1875: 401, pl.13 [Memoirs of the Boston Society of Natural History. 2] Bahamian, Atlantic. Valid as Aiolochroia crassa (Hyatt, 1875). Description: Massive to lobate, presence of a knob shaped conules. The color is light golden yellow with a small mixture of colors in different areas. When taken out of water specimen turns to dark purple and dry specimens are purple black. Distribution: This species was found in the Pearl oyster paar (rocky bottom) was covered by coral sand of Kayalpatnam. Widely known from Atlantic Ocean (Laubenfels, 1950; Wiedenmayer, 1977; Rützler et al., 2009; Van Soest, 2017), Caribbean Sea (Van Soest, 1978; Zea,1987; Lehnert,1993; Rützler et al., 2000) and Gulf of Mexico (Green, 1977). Remarks: The species occurs in the Gulf of Mexico and Atlantic Ocean. Laubenfels (1948) recorded its occurrence in the IndoWest Pacific. Most probably the species may be introduced into Gulf of Mannar Ecosystem especially the present locality Kayalpatnam was an ancient port during the 15th century and a lot of fishing activities occurred during that period from Atlantic Ocean. Detailed surveys were undertaken to confirm its occurrence at Kayalpatnam as an alien species. Family Axinellidae Carter, 1875 2. Axinella damicornis (Esper, 1794) (Plate I, Fig. 2) Systematics Class: Demospongiae Sollas, 1885 Order: Axinellida Lévi, 1953 Family: Axinellidae Carter, 1875 Genus: Axinella Schmidt, 1862 (Genus) Species: Axinella damicornis (Esper, 1794) Type species: Spongia damicornis Esper, 1794, Esper, 1794:249, pl. XXIX [Zweyter Theil, Raspe: Nürnberg] locality unclear. Valid as Axinella damicornis (Esper, 1794). 43 M. S. Varsha et al. Description: Branching with branches fused together. Irregular in growth and velvety with dusted blue particles. Live color is orange red. It occurs in the sandy bottom. Distribution: Axinella damicornis was found in the sandy bed of Kayalpatnam. It occurs in the Atlantic Ocean (Van Soest, 1993) and Mediterranean Sea (Topsent, 1934; Idan et al., 2018). Remarks: It is a common species in Mediterranean and its appearance at Kayalpatnam may be due to its introduction from Mediterranean Sea through ship transportation. Order: Clathrinida Hartman, 1958 Family: Clathrinidae Minchin, 1900 Genus: Clathrina Gray, 1867 Species: Clathrina sororcula Van Soest & De Voogd, 2015 Type species: Clathrina sororcula Van Soest & De Voogd, 2015, 14-15, fig.7 [Zootaxa. 3951(1)] Malacca Strait, Singapore. Valid as Clathrina sororcula Van Soest & De Voogd, 2015. Description: Cushion like white, semitransparent tubular body encrusting on rocks. Oscules are visible. Live colouration is white. Presence of sea grass and seaweed along sponge habitat. Family Clathrinidae Minchin, 1900 3.Clathrina sororcula Van Soest & De Voogd, 2015 Distribution: This species was found in the coral sand area of Kayalpatnam. It occurs in the Pacific Ocean (Van Soest and De Voogd, 2015) and Indian Ocean (Van Soest and De Voogd, 2015). (Plate I, Fig. 3) Systematics Class: Calcarea Bowerbank, 1862 Remarks: The Holotype locality was Singapore and Paratype from Indonesia. It is a new record with regard to the Gulf of Mannar Ecosystem. Plate I. New records of sponges from Tuticorin area 1. Aiolochroia crassa 2. Axinella damicornis 3. Clathrina sororcula 4. Clathrina sinusarabica 5. Clathrina coriacea 6. Cliona delitrix 7. Collospongia auris 8. Spirastrella cunctatrix 9. Spheciospongia vesparium (all photographs under water in situ) 44 Journal of the Marine Biological Association of India Vol. 62, No.2, July-December 2020 Biodiversity of sponges off Tuticorin 4. Clathrina sinusarabica Klautau & Valentine, 2003 (Plate I, Fig.4) Systematics Class: Calcarea Bowerbank, 1862 Order: Clathrinida Hartman, 1958 Family: Clathrinidae Minchin, 1900 Genus: Clathrina Gray, 1867 Species: Clathrina sinusarabica Klautau & Valentine, 2003 Type species: Clathrina sinusarabica Klautau & Valentine, 2003,45, fig.37 [Zoological Journal of the Linnean Society. 139(10] Red Sea, Egypt. Valid as Clathrina sinusarabica Klautau & Valentine, 2003. Description: Tubular sponge body encrusting a rock and irregular in shape. Color in fresh condition is white. Distribution: This species was found in the seagrass bed of Kayalpatnam. It occurs in the Red sea (Voigt et al., 2017; Van Soest and De Voogd, 2018) and Indian Ocean (Van Soest and De Voogd, 2018). Remarks: Clathrina sinusarabica is distributed in the Red sea and occurs at Gulf of Aqaba, Northern and Central Red Sea, Saudi Arabia. This is the first report of from Gulf of Mannar of India. 5.Clathrina coriacea (Montagu, 1814) (Plate I, Fig. 5) Systematics Class: Calcarea Bowerbank, 1862 Order: Clathrinida Hartman, 1958 Family: Clathrinidae Minchin, 1900 Genus: Clathrina Gray, 1867 Species: Clathrina coriacea (Montagu, 1814) Type species: Spongia coriacea Montagu, 1814, 116 [Memoirs of the Wernerian Natural History Society. 2(1)] Celtic Seas. Valid as Clathrina coriacea (Montagu, 1814). Description: Sponge body is irregular and loosely formed. It was identified by the presence of triactines which are conical and cylindrical in shape. Distribution: This species was found in the coral reef areas of Kayalpatnam. It occurs in the Mediterranean Sea (Rützler, 1965), Atlantic Ocean (Borojevic, 1967; Wiedenmayer 1977; Rützler 1986), Indian Ocean (Borojevic and Grua, 1965; Thomas, 1979), Pacific Ocean (Ridley, 1881; Kelly et al., 2009), Artic Ocean (Fristedt, 1887; Burton, 1930) and Red sea (Vine, 1986). © Marine Biological Association of India Remarks: This species was reported from several parts of Mediterranean and Atlantic Ocean. The present record is the first report from the Gulf of Mannar of India. It does not seem to be cosmopolitan, but a geographically well-defined species from the North Atlantic. Family Clionaidae d’Orbigny, 1851 6. Cliona delitrix Pang, 1973 (Plate I, Fig. 6) Systematics Class: Demospongiae Sollas, 1885 Order: Clionaida Morrow & Cárdenas, 2015 Family: Clionaidae d’Orbigny, 1851 Genus: Cliona Grant, 1826 Species: Cliona delitrix Pang, 1973 Type species: Cliona delitrix Pang, 1973, 28-31 [Postilla. 161] Greater Antilles. Valid as Cliona delitrix Pang, 1973. Description: Encrusting on coral and damages coral. The oscules are prominent and relatively large. The spicules consist of tylostyles. Colour in live condition is orange. The outer circumference of the species is blue in colour. Distribution: This species was a boring sponge found in the cup coral at Kayalpatnam. It occurs in the Caribbean Sea (Buznego and Alcolado, 1987; Pérez et al., 2017) and Atlantic Ocean (Van Soest, 1981). Remarks: It was reported from Caribbean Sea and Gulf of Mexico. This species also may be introduced to Gulf of Mannar, Ecosystem from other ecosystems. This was the first report of Cliona delitrix from Gulf of Mannar of India. Family Thorectidae Bergquist, 1978 7. Collospongia auris Bergquist, Cambie & Kernan, 1990 (Plate I, Fig.7) Systematics Class: Demospongiae Sollas, 1885 Order: Dictyoceratida Minchin, 1900 Family: Thorectidae Bergquist, 1978 Genus: Collospongia Bergquist, Cambie & Kernan, 1990 Species: Collospongia auris Bergquist, Cambie & Kernan, 1990 Type species: Collospongia auris Bergquist et al, 1990, 350353 [Biochemical Systematics and Ecology. 18 (5):] Great 45 M. S. Varsha et al. Barrier Reef, Australia. Valid as Collospongia auris Bergquist, Cambie & Kernan, 1990. Family: Clionaidae d’Orbigny, 1851 Genus: Spheciospongia Marshall, 1892 Species: Spheciospongia vesparium (Lamarck, 1815) Description: Sponge with a thin body and spread on coral reefs. The live color of the sponge is greenish blue sandy with coral and molluscan shells. Surface is smooth with elevating irregularly. Presence of primary and secondary fibers. Type species: Alcyonium vesparium Lamarck, 1815, 69-89 [Mémoires du Muséum d’Histoire naturelle, Paris. 1] Greater Antilles. Valid as Spheciospongia vesparium (Lamarck, 1815). Distribution: This species was found in the sandy bottom of Kayalpatnam. It occurs in the Pacific Ocean (Bergquist et al., 1990). Description: Sponge body is erect with an apical oscule. It grows to large size. Live color is brown at surface and grey inside. Remark: It was reported from Great Barrier Reefs in Coral Habitat. This is the first report of the speciesfrom the coral ecosystem of Gulf of Mannar, India. Distribution: This species was found in the coral sand area of Kayalpatnam. It occurs in the Atlantic Ocean (George and Wilson, 1919; Arndt, 1927; Laubenfels, 1936; Rützler, 1974; Wiedenmayer, 1977) and the Caribbean Sea (Duchassaing de Fonbressin and Michelotti, 1864; Bowerbank, 1872; Hechtel, 1965; Rützler et al., 2014). Family Spirastrellidae Ridley & Dendy, 1886 8. Spirastrella cunctatrix Schmidt, 1868 Remarks: This species is widely distributed, and this is the first report from Tuticorin area of Gulf of Mannar. (Plate I, Fig. 8) Systematics Class: Demospongiae Sollas, 1885 Order: Clionaida Morrow & Cárdenas, 2015 Family: Spirastrellidae Ridley & Dendy, 1886 Genus: Spirastrella Schmidt, 1868 Species: Spirastrella cunctatrix Schmidt, 1868 Family Microcionidae Carter, 1875 10. Clathria (Clathria) prolifera (Ellis & Solander, 1786) Type species: Spirastrella cunctatrix Schmidt, 1868, 17, pl.III 8 [Drittes Supplement, Wilhelm Engelmann: Leipzig: i-iv] Carribbean. Valid as Spirastrella cunctatrix Schmidt, 1868. Description: Encrusting sponge which occurs in the coral area. Tylostyles and spirasters are present in the skeleton. Live colouration is orange. It is usually attached to cup coral. Distribution: This species was found in the coral plates of Kayalpatnam. It occurs in the Mediterranean Sea (Lévi, 1957; Rützler, 1965; BouryEsnault, 1971), Atlantic Ocean (Lévi, 1959; Logan et al., 1984; Van Soest, 2001), Indian Ocean (Hentschel, 1909; Vacelet and Vasseur, 1971), Caribbean Sea ( Laubenfels, 1936) Pacific Ocean (DesqueyrouxFaúndez, 1990) and Red sea (Lévi, 1965). Remarks: It was reported from different localities like Mediterranean, West Indies and Atlantic. This is the first report of sponge from Gulf of Mannar, India. 9. Spheciospongia vesparium (Lamarck, 1815) (Plate I, Fig. 9) Systematics Class: Demospongiae Sollas, 1885 Order: Clionaida Morrow & Cárdenas, 2015 46 (Plate II, Fig.10) Systematics Class: Demospongiae Sollas, 1885 Order: Poecilosclerida Topsent, 1928 Family: Microcionidae Carter, 1875 Genus: Clathria Schmidt, 1862 Sub Genus: Clathria (Clathria) Schmidt, 1862 Species: Clathria (Clathria) prolifera (Ellis & Solander, 1786) Type species: Spongia prolifera Ellis & Solander, 1786, 189190 [Systematically arranged and described by the late Daniel Solander. 4] New Jersey, NW Atlantic. Valid as Clathria (Clathria) prolifera (Ellis & Solander, 1786). Description: Encrusting, lamellate and attached to coral rocks and pearl oyster paars. Small, short tubular. The skeleton has subtylostyles, microscleres and toxas. Live color is orange red. Distribution: This species was found in the sandy area of Kayalpatnam. Occurs in the Atlantic Ocean (Desor, 1848 (1851); Lambe, 1896; George and Wilson, 1919; Johnson, 1971; Van Soest, 1984; Trott, 2004). Remarks: Originally described from New Jersey, NW Atlantic and subsequently reported from the whole Eastern Seaboard of the USA and south to Florida, Mexico and Brazil. The tropical Journal of the Marine Biological Association of India Vol. 62, No.2, July-December 2020 Biodiversity of sponges off Tuticorin records of this species need to be re-examined and are expected to belong to a different species (van Soest, 1993). This is the first report from Tuticorin area of Gulf of Mannar. Description: Encrusting, massive, smooth, color seems to be red coloured. Compressible and tough. Surface is smooth with dermal membrane. Skeleton containing acanthostyles, oxeas and sigma. Live color is bright red. Family Crellidae Dendy, 1922 11.Crella incrustans (Carter, 1885) (Plate II, Fig.11) Systematics Class: Demospongiae Sollas, 1885 Order: Poecilosclerida Topsent, 1928 Family: Crellidae Dendy, 1922 Genus: Crella Gray, 1867 Species: Crella incrustans (Carter, 1885) Type species: Echinonema incrustans Carter, 1885, 353 [Annals and Magazine of Natural History. (5) 16(94)] Bassian, Port Phillips. Valid as Crella incrustans (Carter, 1885). Distribution: This species was found in the coral reef area of Kayalpatnam. Occurs in the Pacific Ocean (Kim and Sim, 2001; Kelly et al., 2009; Whitelegge, 1901). Remarks: The present record is new to Tuticorin area of Gulf of Mannar Ecosystem. Family Crambeidae Lévi, 1963 12. Crambe crambe (Schmidt, 1862) (Plate II, Fig.12) Systematics Class: Demospongiae Sollas, 1885 Plate II. New records of sponges from Tuticorin area 10. Clathria (Clathria) prolifera 11. Crella incrustans 12. Crambe crambe 13. Phorbas plumosus 14. Hyattella pertusa 15. Petrosia (Petrosia) ficiformis 16. Xestospongia muta 17. Plakortis simplex 18. Sycon ciliatum (all photographs under water in situ except 10) © Marine Biological Association of India 47 M. S. Varsha et al. Order: Poecilosclerida Topsent, 1928 Family: Crambeidae Lévi, 1963 Genus: Crambe Vosmaer, 1880 Species: Crambe crambe (Schmidt, 1862) Family Spongiidae Gray, 1867 14. Hyattella pertusa (Esper, 1794) Type species: Suberites crambe Schmidt, 1862, 1-88, pl.1-7 [Die Spongien des adriatischen Meeres Wilhelm Engelmann: Leipzig: i-viii] Adriatic Sea. Valid as Crambe crambe (Schmidt, 1862) Description: Encrusting, massive, tubular growth form flat crust. Surface translucent. Live colouration is light orange. Distribution: This species was found attached to cup coral and dead molluscan shells in the coral reef area of Kayalpatnam. Occurs in the Mediterranean Sea (Schmidt, 1862; Topsent, 1892; Burton, 1936; Sarà and Siribelli, 1960), Indian Ocean (Barnes and Bell, 2002) and Atlantic Ocean (Van Soest, 2001; Boury-Esnault et al., 2001 [2005]). Remarks: This is the first report of Crambe crambe from the Gulf of Mannar Ecosystem. (Plate II, Fig.14) Systematics Class: Demospongiae Sollas, 1885 Order: Dictyoceratida Minchin, 1900 Family Spongiidae Gray, 1867 Genus: Hyattella Lendenfeld, 1888 Species: Hyattella pertusa (Esper, 1794) Type species: Spongia pertusa Esper, 1794, [Zweyter Theil Raspe: Nürnberg 1-303] India. Valid as Hyattella pertusa (Esper, 1794). Description: Solid, cup shaped massive sponge body. Several lobes present in the body. The upper surface more or less flattened. Very dense and smooth. Skeleton composed of primary fibers and secondary fibers. Live colouration is dark brown. Family Hymedesmiidae Topsent, 1928 Distribution: This species was found in the coral reef area of Kayalpatnam. It occurs in the Indian Ocean (Esper, 1794; Hooper and Van Soest, 2002). 13. Phorbas plumosus (Montagu, 1814) Remarks: This is the first report from the Gulf of Mannar Ecosystem. (Plate II, Fig.13) Systematics Class: Demospongiae Sollas, 1885 Order: Poecilosclerida Topsent, 1928 Family: Hymedesmiidae Topsent, 1928 Genus: Phorbas Duchassaing & Michelotti, 1864 Species: Phorbas plumosus (Montagu, 1814) Family Petrosiidae van Soest, 1980 15. Petrosia (Petrosia) ficiformis (Poiret, 1789) Type species: Spongia plumosa Montagu, 1814, 116 [Memoirs of the Wernerian Natural History Society. 2(1)] Celtic Seas. Valid as Phorbas plumosus (Montagu, 1814). Description: Thickly encrusting, massive, aereolate surface. Live coloration is red. Distribution: This species was found in the coral reef area of Kayalpatnam. It occurs in the Mediterranean Sea (Topsent, 1892; Sarà, 1961; Evcen and Çinar, 2012), Atlantic Ocean (Montagu, 1814; Bowerbank, 1867; Stephens, 1912; BouryEsnault and Lopes, 1985; Van Soest, 2001) and the Indian Ocean (Carter, 1881). Remarks: This is the first report of Phorbas plumosus from Gulf of Mannar. 48 (Plate II, Fig. 15) Systematics Class: Demospongiae Sollas, 1885 Order: Haplosclerida Topsent, 1928 Family: Petrosiidae van Soest, 1980 Genus: Petrosia Vosmaer, 1885 Sub Genus: Petrosia (Petrosia) Vosmaer, 1885 Species: Petrosia (Petrosia) ficiformis (Esper, 1794) Spongia ficiformis Poiret, 1789: 55-63 [l’Histoire naturelle de ce Pays. Deuxième Partie Années 1785 et 1786] Western Mediterranean. Valid as Petrosia (Petrosia) ficiformis (Esper, 1794). Description: Massive sponge, irregularly globular with a wide base, several fused lobes. Distribution: This species was found in the coral reef area of Kayalpatnam. It occurs in the Mediterranean Sea (Poiret, 1789; Schmidt, 1864; Topsent1928; Lévi, 1957) and Atlantic Ocean (Topsent, 1928; Burton, 1956; Lévi and Vacelet, 1958; Van Soest, 2001). Journal of the Marine Biological Association of India Vol. 62, No.2, July-December 2020 Biodiversity of sponges off Tuticorin Remarks: Basically, Petrosia ficiformis occur in the Mediterranean and Atlantic Ocean. May be this species is also introduced to Gulf of Mannar ecosystem through shipping and transport. 16. Xestospongia muta (Schmidt, 1870) (Plate II, Fig.16) Systematics Class: Demospongiae Sollas, 1885 Order: Haplosclerida Topsent, 1928 Family: Petrosiidae van Soest, 1980 Genus: Xestospongia Laubenfels, 1932 Species: Xestospongia muta (Schmidt, 1870) Type species: Schmidtia muta Schmidt, 1870, 44-45 [Gebietes Wilhelm Engelmann: Leipzig iii-iv] Floridian. Valid as Xestospongia muta (Schmidt, 1870). Description:Discoid body, surface tuberculate, massive or encrusting. Distribution: This species was found in the coral reef area of Kayalpatnam. It occurs in the Atlantic Ocean (Schmidt, 1870; Laubenfels, 1953; Wiedenmayer, 1977; Hajdu and Fernandez et al., 2011; Van Soest, 2017) and Caribbean Sea (Alcolado, 1976; Van Soest, 1980; Zea, 1987; Rützler et al., 2000; Alcolado and Busutil, 2012; Pérez et al., 2017). Remarks: This species belongs to Barrel sponge group. Among this group two other species, Xestospongia testudinaria and Petrosia ficiformis were already reported from India. The Xestospongia muta is a new record from Gulf of Mannar. Family Plakinidae Schulze, 1880 17. Plakortis simplex Schulze, 1880 (Plate II, Fig.17) Systematics Class: Homoscleromorpha Bergquist, 1978 Order: Homosclerophorida Dendy, 1905 Family: Plakinidae Schulze, 1880 Genus: Plakortis Schulze, 1880 Species: Plakortis simplex Schulze, 1880 Type species: Plakortis simplex Schulze, 1880, 430-433 [Zeitschrift für wissenschaftliche Zoologie. 34(2)] Western Mediterranean. Valid as Plakortis simplex Schulze, 1880 Description: Thin to massive, encrusting, brown in colour, surface smooth with ostia. © Marine Biological Association of India Distribution: This species was found in the coral reef area of Kayalpatnam. It occurs in the Mediterranean Sea (Schulze, 1880; Topsent, 1934; Lévi, 1952). The Atlantic Ocean (Ferrer Hernández, 1918; Topsent, 1928; Burton, 1930; Borojevic et al., 1968; Boury-Esnault, 1973; Van Soest, 1993) The Pacific Ocean (Topsent, 1897; Laubenfels, 1950), the Indian Ocean (Vacelet et al., 1976; Thomas, 1979,1981). Remarks: This species is widely distributed, and Thomas reported it from Mozambique Channel and Mahe Island. The present record is new to Tuticorin area of Gulf of Mannar area. Family Sycettidae Dendy, 1893 18. Sycon ciliatum (Fabricius, 1780) (Plate II, Fig.18) Systematics Class: Calcarea Bowerbank, 1862 Order: Leucosolenida Hartman, 1958 Family: Sycettidae Dendy, 1893 Genus: Sycon Risso, 1827 Species: Sycon ciliatum (Fabricius, 1780) Type species: Spongia ciliata Fabricius, 1780, 452 pp. Fauna Groenlandica, systematice sistens animalia groenlandiae occidentalis hactenus indagata, quoad nomen specificium, triviale, vernaculumque, synonyma auctorum plurimum, descriptionem, locum, victum, generationem, mores, usum capturamque singuli, pro ut detegendi occasio fuit, maximaque parte secundum proprias observations] East Greenland. Valid as Sycon ciliatum (Fabricius, 1780) Description: Tubular usually single, smooth, soft, papillate and having single terminal oscula which is fringed with a crown of spicules. They are attached to hard substrate like coral reefs/ rocks, surface smooth. Color pale white. Distribution: This species was found in the coral reef area of Kayalpatnam. It occurs in the Mediterranean Sea (Ellis and Solander, 1786; Schmidt, 1862; Haeckel,1872; Burton, 1936; Topsent and Olivier, 1943), Atlantic Ocean (Fabricius, 1780; Topsent, 1891; Burton, 1933; Borojevic, 1967; Tendal, 1970; Rützler, 1986; Van Soest, 2001), Pacific Ocean (Kelly et al., 2009), Artic Ocean (Haeckel,1872; Arnesen, 1900; Burton, 1930) and Indian Ocean (Trott, 2004; Van Soest and Voogd, 2018). Remarks: The present record is an extension of the distribution of Sycon ciliatum to the Tuticorin area of Gulf of Mannar. 49 M. S. Varsha et al. Common species A total of 17 species of sponges was found to be the most common and abundant from the Hare Island, Tuticorin Harbour Beach, Tharuvaikulam, Mottagopuram, Vellapatti, Inico Nagar, Kayalpatnam, Pattanamaruthur, Sippikulam, Veerapandiyapatnam, Kulasekharapatnam, Alanthalai, Manappad and Periathalai locations. They are Spongionella nigra, Clathria (Clathria) indica, Aulospongus tubulatus, Callyspongia (Euplacella) communis, Axinella donnani (Plate III, Fig.3), Amphimedon subcylindrica, Stylissa carteri, Iotrochota purpurea, Mycale (Mycale) grandis, Mycale (Zygomycale) parishii, Dysidea incrustata, Hyattella intestinalis, Ircinia fusca, Phyllospongia lamellose, Pione margaritiferae, Hemimycale columella (Plate III, Fig.6) and Fasciospongia anomala (Plate III, Fig.5). Invasive sponges Species invasion is a universal phenomenon throughout the world and sponges are no exception to it. The major factors influence the sponge invasion are the ship transportation, ballast water, attachment and biofouling in ships and other vessels, transportation through major ocean canals like Suez Canal and Panama Canal and human activities helps in the successful colonization of invasive species into new environments. In the present study five species of new records of sponges’ can be considered as new introduction to the Kayalpatanam area from other places through ship transport. The probable invasive species to this area are Aiolochroia crassa, Clathrina sororcula, Cliona delitrix, Crella incrustans and Crambe crambe. There are similar reports of the sponge about the sponge invasion around the world. Sponge invasions were reported in localities of Dutch coastal waters (Van Soest et al., 2007), Atlantic Ocean (Daniela and Janussen, 2011), Mediterranean Sea (Longo et al., 2007) and Gulf of Morbihan (Perez et al., 2006). Massive sponges The characteristic feature of the Tuticorin coast is the presence and abundance of massive barrel sponges of different size groups. The most abundant species are Xestospongia testudinaria (Lamarck, 1815) (=Pertosia testudinaria) followed by Neopetrosia similis (Ridley & Dendy, 1886) in the rocky bottom of 10-23 m depth zone. Besides this the Aiolochroia crassa, Spheciospongia inconstans (Hyatt, 1875), Iotrochota purpurea (Bowerbank, 1875) are also observed in Tuticorin coast. The past studies along the different pearl oyster beds revealed the abundance of the two species along the coast (Dendy, 1905; Hornell, 1905; Nayar and Mahadevan, 1964, 1987; Mahadevan and Nayar, 1967, 1974; Thomas, 1986). Moreover, the underwater survey conducted in Kayalpatnam area provided information about the loss of biodiversity of sponges in that area as compared to the previous works. The major reasons behind the decline of the number of large species may be attributed to the continuous disturbance of the bottom habitat by navigation of boats and other anthropogenic activities. Another important observation is the decline in the visual spotting of the barrel sponge (Xestospongia testudinaria, Xestospongia muta) which was very abundant during 1889 and 1976 periods at Kayalpatnam paars. It is a great concern to the ecology of the sponge beds Plate III. Sponge fauna of Tuticorin area 1. Spirastrella coccinea 2. Amorphinopsis excavans 3. Axinella donnani 4. Cliona celata 5. Fasciospongia anomala 6. Hemimycale columella (all photographs under water in situ except 3 and 5) 50 Journal of the Marine Biological Association of India Vol. 62, No.2, July-December 2020 Biodiversity of sponges off Tuticorin Table 1. Check list of sponges occurring in the Tuticorin area No Order Family Species name Reference 1 Poecilosclerida Acarnidae Acarnus ternatus Ridley, 1884 Dendy, 1905; Thomas, 1986* 2 Verongiida Aplysinidae Aiolochroia crassa (Hyatt, 1875) New record, Present study 3 Suberitida Halichondriidae Amorphinopsis excavans Carter, 1887 Thomas, 1986 4 Suberitida Halichondriidae Amorphinopsis foetida (Dendy, 1889) Dendy, 1905 5 Haplosclerida Niphatidae Amphimedon brevispiculifera (Dendy, 1905) Dendy, 1905 6 Haplosclerida Niphatidae Amphimedon delicatula (Dendy, 1889) Dendy, 1905 7 Haplosclerida Niphatidae Amphimedon subcylindrica (Dendy, 1905) Mahadevan & Nayar, 1967† 8 Poecilosclerida Microcionidae Antho (Plocamia) manaarensis (Carter, 1880) Dendy, 1905; Anita & Lazarus, 2006 9 Tetractinellida Ancorinidae Asteropus haeckeli Dendy, 1905 Dendy, 1905 10 Axinellida Axinellidae Auletta elongata Dendy, 1905 Dendy, 1905 11 Axinellida Axinellidae Auletta lyrata (Esper, 1794) Dendy, 1905 12 Axinellida Raspailiidae Aulospongus tubulatus (Bowerbank, 1873) Dendy, 1905; Mahadevan & Nayar, 1967 13 Axinellida Axinellidae Axinella donnani (Bowerbank, 1873) Dendy, 1905 14 Axinellida Axinellidae Axinella damicornis (Esper, 1794) New record, Present study 15 Axinellida Axinellidae Axinella halichondrioides Dendy, 1905 Dendy, 1905 16 Axinellida Axinellidae Axinella labyrinthica Dendy, 1889 Dendy, 1905 17 Axinellida Axinellidae Axinella manus Dendy, 1905 Dendy, 1905 18 Biemnida Biemnidae Biemna tubulata (Dendy, 1905) Dendy, 1905; Thomas, 1986 19 Haplosclerida Callyspongiidae Callyspongia (Callyspongia) nuda (Ridley, 1884) Dendy, 1905 20 Haplosclerida Callyspongiidae Callyspongia (Callyspongia) reticutis (Dendy, 1905) Dendy, 1905 21 Haplosclerida Callyspongiidae Callyspongia (Cladochalina) diffusa (Ridley, 1884) Dendy, 1905 22 Haplosclerida Callyspongiidae Callyspongia (Cladochalina) spinilamella (Dendy, 1889) Dendy, 1905 23 Haplosclerida Callyspongiidae Callyspongia (Cladochalina) subarmigera (Ridley, 1884) Dendy, 1905 24 Haplosclerida Callyspongiidae Callyspongia (Euplacella) communis (Carter, 1881) Dendy, 1905; Mahadevan & Nayar, 1967 25 Haplosclerida Callyspongiidae Callyspongia (Toxochalina) ridleyi (Dendy, 1905) Dendy, 1905 26 Haplosclerida Callyspongiidae Callyspongia (Toxochalina) robusta (Ridley, 1884) Dendy, 1905 27 Haplosclerida Callyspongiidae Callyspongia clathrata (Dendy, 1905) Dendy, 1905 28 Clionaida Clionaidae Cervicornia cuspidifera (Lamarck, 1815) Thomas, 1986 29 Tetractinellida Tetillidae Cinachyrella hirsuta (Dendy, 1889) Dendy, 1905 30 Suberitida Halichondriidae Ciocalypta digitata (Dendy, 1905) Dendy, 1905 31 Poecilosclerida Microcionidae Clathria (Clathria) prolifera (Ellis & Solander, 1786) New record, Present study 32 Clathrinida Clathrinidae Clathrina sororcula Van Soest & De Voogd, 2015 New record, Present study 33 Clathrinida Clathrinidae Clathrina sinusarabica Klautau & Valentine, 2003 New record, Present study 34 Clathrinida Clathrinidae Clathrina coriacea (Montagu, 1814) New record, Present study 35 Poecilosclerida Microcionidae Clathria (Clathria) indica Dendy, 1889 Dendy, 1905 Mahadevan & Nayar, 1967 36 Poecilosclerida Microcionidae Clathria (Thalysias) procera (Ridley, 1884) Dendy, 1905 Mahadevan & Nayar, 1967 37 Poecilosclerida Microcionidae Clathria (Thalysias) vulpina (Lamarck, 1814) Dendy, 1905; Anita & Lazarus, 2006β 38 Clionaida Clionaidae Cliona celata Grant, 1826 Thomas, 1986 39 Clionaida Clionaidae Cliona orientalis Thiele, 1900 Thomas, 1986 © Marine Biological Association of India 51 M. S. Varsha et al. No Order Family Species name Reference 40 Clionaida Clionaidae Cliona delitrix Pang, 1973 New record, Present study 41 Clionaida Clionaidae Cliothosa aurivillii (Lindgren, 1897) Thomas, 1986 42 Dictyoceratida Thorectidae Collospongia auris Bergquist, Cambie & Kernan, 1990 New record, Present study 43 Poecilosclerida Crellidae Crella incrustans (Carter, 1885) New record, Present study 44 Poecilosclerida Crambeidae Crambe crambe (Schmidt, 1862) New record, Present study 45 Tetractinellida Tetillidae Craniella elegans Dendy, 1905 Dendy, 1905 46 Clionaida Clionaidae Dotona pulchella Carter, 1880 Thomas, 1986 47 Dictyoceratida Dysideidae Dysidea incrustata (Dendy, 1905) Dendy, 1905 48 Dictyoceratida Dysideidae Dysidea pallescens (Schmidt, 1862) Dendy, 1905 49 Axinellida Raspailiidae Echinodictyum clathratum Dendy, 1905 Sivaleela,2014 50 Axinellida Raspailiidae Echinodictyum flabelliforme (Keller, 1889) Dendy, 1905 51 Tetractinellida Ancorinidae Ecionemia acervus Bowerbank, 1862 Dendy, 1905 52 Axinellida Raspailiidae Endectyon (Endectyon) fruticosum (Dendy, 1887) Dendy, 1905; Thomas, 1986 53 Axinellida Raspailiidae Endectyon (Endectyon) hornelli (Dendy, 1905) Dendy, 1905; Mahadevan & Nayar, 1967 54 Axinellida Raspailiidae Endectyon (Endectyon) lamellosum Thomas, 1976 Thomas, 1986 55 Dictyoceratida Thorectidae Fasciospongia anomala (Dendy, 1905) Dendy, 1905; Sivaleela,2014 56 Haplosclerida Niphatidae Gelliodes carnosa Dendy, 1889 Dendy, 1905; Anita & Lazarus, 2006β 57 Haplosclerida Niphatidae Gelliodes incrustans Dendy, 1905 Dendy, 1905; Thomas, 1986 58 Tetractinellida Geodiidae Geodia areolata Carter, 1880 Dendy, 1905; Anita & Lazarus, 2006 59 Tetractinellida Geodiidae Geodia ramodigitata Carter, 1880 Dendy, 1905; Thomas, 1986 60 Haplosclerida Chalinidae Haliclona (Gellius) fibulata (Schmidt, 1862) Dendy, 1905 61 Haplosclerida Chalinidae Haliclona (Gellius) cymaeformis (Esper, 1806) Dendy, 1905 62 Poecilosclerida Hymedesmiidae Hemimycale columella (Bowerbank, 1874) Dendy, 1905 63 Poecilosclerida Microcionidae Holopsamma crassa Carter, 1885 Dendy, 1905 64 Dictyoceratida Spongiidae Hyattella cavernosa (Pallas, 1766) Dendy, 1905 65 Dictyoceratida Spongiidae Hyattella intestinalis (Lamarck, 1814) Dendy, 1905; Thomas, 1986 66 Dictyoceratida Spongiidae Hyattella cribriformis (Hyatt, 1887) Thomas, 1986 67 Dictyoceratida Spongiidae Hyattella pertusa (Esper, 1794) New record, Present study 68 Poecilosclerida Iotrochotidae Iotrochota purpurea (Bowerbank, 1875) Mahadevan & Nayar, 1967 69 Poecilosclerida Iotrochotidae Iotrochota baculifera Ridley, 1884 Thomas, 1986 70 Dictyoceratida Irciniidae Ircinia fusca (Carter, 1880) Dendy, 1905; Thomas, 1986 71 Dictyoceratida Irciniidae Ircinia ramosa (Keller, 1889) Thomas, 1986 72 Dictyoceratida Irciniidae Ircinia schulzei (Dendy, 1905) Dendy, 1905 73 Leucosolenida Grantiidae Leucandra donnani Dendy, 1905 Dendy, 1905 74 Tetractinellida Scleritodermidae Microscleroderma herdmani (Dendy, 1905) Dendy, 1905 75 Poecilosclerida Mycalidae Mycale (Mycale) grandis Gray, 1867 Mahadevan & Nayar, 1967; Thomas, 1986 76 Poecilosclerida Mycalidae Mycale (Mycale) gravelyi Burton, 1937 Thomas, 1986 77 Poecilosclerida Mycalidae Mycale (Zygomycale) parishii (Bowerbank, 1875) Mahadevan & Nayar, 1967; Thomas, 1986 78 Poecilosclerida Myxillidae Myxilla (Ectyomyxilla) arenaria Dendy, 1905 Dendy, 1905; Mahadevan & Nayar, 1967 52 Journal of the Marine Biological Association of India Vol. 62, No.2, July-December 2020 Biodiversity of sponges off Tuticorin No Order Family Species name Reference 79 Haplosclerida Petrosiidae Neopetrosia similis (Ridley & Dendy, 1886) Dendy, 1905; Mahadevan & Nayar, 1967 80 Haplosclerida Niphatidae Niphates obtusispiculifera (Dendy, 1905) Dendy, 1905 81 Haplosclerida Phloeodictyidae Oceanapia sagittaria (Sollas, 1902) Dendy, 1905; Sivaleela,2014 82 Haplosclerida Phloeodictyidae Oceanapia zoologica (Dendy, 1905) Dendy, 1905; Thomas, 1986 83 Tetractinellida Tetillidae Paratetilla bacca (Selenka, 1867) Dendy, 1905 84 Bubarida Desmanthidae Petromica (Petromica) massalis Dendy, 1905 Dendy, 1905 85 Axinellida Axinellidae Phakellia symmetrica Dendy, 1905 Dendy, 1905; Mahadevan & Nayar, 1967 86 Homoscleromorpha Plakinidae Plakortis simplex Schulze, 1880 New record, Present study 87 Dictyoceratida Thorectidae Phyllospongia lamellosa (Esper, 1794) Thomas, 1986 88 Dictyoceratida Thorectidae Phyllospongia papyracea (Esper, 1806) Dendy, 1905; Thomas, 1986 89 Haplosclerida Petrosiidae Petrosia (Petrosia) ficiformis (Poiret, 1789) New record, Present study 90 Clionaida Clionaidae Pione carpenteri (Hancock, 1867) Thomas, 1986 91 Clionaida Clionaidae Pione margaritiferae (Dendy, 1905) Dendy, 1905; Thomas, 1986 92 Clionaida Clionaidae Pione vastifica (Hancock, 1849) Mahadevan & Nayar, 1967 93 Verongiida Pseudoceratinidae Pseudoceratina purpurea (Carter, 1880) Dendy, 1905 94 Poecilosclerida Hymedesmiidae Phorbas plumosus (Montagu, 1814) New record, Present study 95 Dictyoceratida Thorectidae Scalarispongia scalaris (Schmidt, 1862) Dendy, 1905 96 Clionaida Clionaidae Spheciospongia inconstans (Dendy, 1887) Mahadevan & Nayar, 1967 97 Clionaida Clionaidae Spheciospongia vesparium (Lamarck, 1815) New record, Present study 98 Clionaida Clionaidae Spheciospongia vagabunda (Ridley, 1884) Dendy, 1905 99 Clionaida Spirastrellidae Spirastrella coccinea (Duchassaing & Michelotti, 1864) Thomas, 1986 100 Clionaida Spirastrellidae Spirastrella cunctatrix Schmidt, 1868 New record, Present study 101 Dictyoceratida Spongiidae Spongia (Spongia) officinalis Linnaeus, 1759 Thomas, 1986 102 Dendroceratida Dictyodendrillidae Spongionella nigra Dendy, 1889 Dendy, 1905; Mahadevan & Nayar, 1967 103 Dendroceratida Dictyodendrillidae Spongionella pulvilla (Dendy, 1905) Dendy, 1905 104 Suberitida Halichondriidae Spongosorites topsenti Dendy, 1905 Dendy, 1905 105 Tetractinellida Ancorinidae Stelletta agglutinans (Dendy, 1905) Dendy, 1905 106 Tetractinellida Ancorinidae Stelletta herdmani Dendy, 1905 Dendy, 1905 107 Tetractinellida Ancorinidae Stelletta vestigium Dendy, 1905 Dendy, 1905 108 Scopalinida Scopalinidae Stylissa carteri (Dendy, 1889) Mahadevan & Nayar, 1967; Anita & Lazarus, 2006β 109 Leucosolenida Sycettidae Sycon ciliatum (Fabricius, 1780) New record, Present study 110 Suberitida Suberitidae Terpios cruciatus (Dendy, 1905) Dendy, 1905 111 Tethyida Tethyidae Tethya aurantium (Pallas, 1766) Dendy, 1905 112 Tetractinellida Tetillidae Tetilla poculifera Dendy, 1905 Dendy, 1905 113 Haplosclerida Petrosiidae Xestospongia testudinaria (Lamarck, 1815) Dendy, 1905; Mahadevan & Nayar, 1967 Haplosclerida Petrosiidae Xestospongia muta (Schmidt, 1870) New record, Present study 114 Thomas, 1986*, Anita & Lazarus, 2006 ß : The species pertaining to Tuticorin area was taken from the reference as it deals with majority of the sponges from Gulf of Mannar area in general. Mahadevan & Nayar, 1967† The species name was taken from the reference and those with only generic name was omitted. of this area. The barrel sponges are one of the best known for their ability to filter huge quantities of sea water and harbours proteobacterial and cyanobacterial endosymbionts in their mesohyl, which plays an essential role in cycling nutrients © Marine Biological Association of India in the reefs . The microbes in the sponge and continuous filtration of sea water helps in the recycling of the nitrogen, carbon and other nutrients to the next trophic level (Rützler, 1990; Diaz and Rützler, 2001; Morrow et al., 2016; McMurray, 53 M. S. Varsha et al. 2017). The frequent heavy storms and cyclones, mechanical damage to the sponge body, bleaching and disease of the sponges due to the climate change might have attributed to the decline in the population of barrel sponges. At the same time, the area of incrustation was found to increase by the encrusting sponge species like Clathria (Clathria) indica in the coral and paar areas. It was noticed that the Cup coral of this area was heavily encrusted by the Clathria species. Reason for the bleaching of the Coral may be due to the poor water quality and temperature variation. sponge specimens and reference specimens were deposited in the National Repository, Marine Biodiversity Museum in CMFRI, Kochi. The previous studies along the coast revealed a lot of information about species diversity, ecological diversity, biodiversity loss, boring sponges and fauna of pearl oyster beds and sponge - coral interactions (Dendy, 1905; Nayar and Mahadevan, 1987; Thomas, 1993, 2000; Anita and Lazarus, 2006). The new information about the massive sponges and boring sponges along the coast will be useful for the conservation of the biodiversity of the coasts. Boring sponges Hornell’s report (1905) on the sponge fauna in the pearl oyster bed gives a clear understanding of the different species of sponges, diversity, habitat types and distribution pattern of sponges during 1889 along the different habitats of Tuticorin area. The exploratory surveys conducted in the different paar groups of Vaipar, Tuticorin, Utti, Tolayiram, Pulipundu, Kanna Tivu, Nedunchechan, Kudamuttu, Thundu and Manapad resulted in the detailed account of the sponge species occurring in that area. Most abundant species reported by Hornell (1905) were Clathria (Clathria) indica, Spongionella nigra , Callyspongia ( Euplacella ) communis (= Siphonochalis communis ), Spheciospongia inconstans (=Suberitus inconstans), Aulospongus tubulatus (=Axinella tubulata ), Axinella donani , Xestospongia testudinaria (=Petrosia testudinaria) and Neopetrosia similis (=Petrosia smilis). Besides this, a total of 78 species were reported from this area of Gulf of Mannar. The most common boring sponges recorded from this area were Amorphinopsis excavans Carter, 1887 (Plate III, Fig.2); Cliona celata Grant, 1826 (Plate III, Fig.4); Cliona orientalis Thiele, 1900; Cliona delitrix Pang, 1973; Cliothosa aurivillii (Lindgren, 1897); Spirastrella cunctatrix Schmidt, 1868; Spirastrella coccinea (Duchassaing & Michelotti, 1864) (Plate III, Fig.1); Spheciospongia inconstans (Dendy, 1887); Spheciospongia vesparium (Lamarck, 1815); Spheciospongia vagabunda (Ridley, 1884) and Cervicornia cuspidifera (Lamarck, 1815) which were attached to different hosts like Corals (Pocillopora damicorinis), Mollusc shells (Crassostrea madrasensis, Xancus pyrum, Turbo intercostalis, Hemifusus cochlidium, Rapana bulbosa, Strombus sp., Babylonia spirata, Murex virgineus, M. tarpa, M. ramosus, Placuna placenta, Crassostrea cucullata, Pinctada fucata, Cardium spp., Conus spp., Chaina reflexa), calcareous algae and coralline algae. Past studies revealed that boring sponges caused damage to the pearl oyster beds and coral reefs along the Tuticorin coast (Dendy, 1905; Nayar and Mahadevan, 1987; Thomas, 1993, 2000; Anita and Lazarus, 2006). The Tuticorin coast from Vaipar to Manappad contains about 33 Pearl oyster beds (Paars) falling into four zones, and the largest one is Tholayiram Paar. The average depth of the paar is 10-23 m and the area ranged from 1 to 20 km2. Variations observed in the nature of the substratum as flat rock, rocky and coral bed, rocky and sandy, rocky and shells, sandy with rocks, rock with crevices and sandy with muddy (Varma, 1960). The high diversity in the substrata resulted in the ecosystem services which resulted in the species variation in the corals, sponges and associated fauna. Past underwater observation of these paars reported the presence of species of boring sponges (Dendy, 1905; Nayar and Mahadevan, 1987). The major reason for the decline of the Pearl fishery along the coast may be attributed to the high exploitation through intensive fishery, damage caused by the boring sponges, predation and disease (Hornell, 1905; Thomas, 1993, 2000). The present study reported 18 new records from the Tuticorin coast and resulted in the collection and preservation of 192 54 Out of the underwater exploration conducted by Nayar and Mahadevan (1964, 1974) important information about the sponges of Tuticorin emerged. These extensive surveys revealed the presence of about 77 species of sponges from different pearl oyster paars of Tuticorin (Mahadevan and Nair, 1967, 1974 Nayar and Mahadevan, 1964, 1987). The most abundant species reported by their studies were Callyspongia (Euplacella) communis, Spongionella nigra, Petrosis testudinaria, Spheciospongia inconstans, Aulospongia tubulatus, Amphimedon subcylindrica, Stylissa carteri (=Axinella carteri), Iotrcoha spp., Clathria spp., Axinella donani, Clathria indica and Spheciospongia inconstans. Thomas (1986) provided a detailed account of the sponge fauna of Gulf of Mannar and Palk Bay. A total of 275 species belonging to eight orders 38 families and 136 genera were reported. His study covered the localities of Gulf of Mannar from Rameswaram to Tuticorin and the study reported all the sponges recorded in the Tuticorin area of GOM in the previous works as well as new species described by the author (Thomas, 1971, 1986). Anita and Lazraus (2006) studied 50 species of sponges belonging to six orders, 16 families and 28 genera from Gulf of Mannar ecosystem. Journal of the Marine Biological Association of India Vol. 62, No.2, July-December 2020 Biodiversity of sponges off Tuticorin The Report on the Pearl oyster fisheries recorded that boring sponges are the enemy of Pearl oysters (Hornell, 1905). The species reported was Cliona margaritifera. Considerable work on the systematics and distribution pattern during the nineteenth century revealed the presence of 32 species of boring sponges from Indian seas with an order of abundance, such that Cliona celata, Pione vastifica and Pione carpenteri on chanks; Pione vastifica and Cliona celata on pearl oysters; Cliona celata, Pione vastifica and Pione carpenteri on edible oysters; Cliona celata, Cervicornia cuspidifera, Spheciospongia inconstans and Cliothosa aurivillii on corals (Nayar and Mahadevan, 1987; Thomas, 1979). The bioinventorying and updating the status of the ecological services provided by the sponge fauna has to continue to get more insight into the present species composition and the interaction between the species and communities occurring in the vast variety of habitats. Sponges are known for its multifold ecological goods and services. The policy formulations can be made using the ecological services provided by the sponge fauna of the coast. Commercial utilization of sponges for several purposes, including extraction of bioactive components is the major provisioning service provided by sponges. Its regulatory services include the filtration of water through canal system which regulates water quality of an area. It supports several other organisms as a source of habitat and place for living and protection. Acknowledgements Authors are grateful to Ministry of Environment, Forest and Climate Change, New Delhi for the Financial Support in the form AICOPTAX project (22018.15 (1) 2015-CS (TAX) on Taxonomical Investigation on Lesser Known Marine Animals of India - Phylum Cnidaria (Class: Anthozoa) Phylum Porifera (Marine). Special thanks to Dr. Kailash Chandra, Director and Dr. C. Raghunathan, Joint Director, Zoological Survey of India, Kolkata for support provided. We acknowledge the sincere help provided by Dr. P. P. Manojkumar, SIC, Tuticorin during the Sponge Surveys we conducted in Gulf of Mannar. References Alcolado, P. M. and L. Busutil. 2012. Inventory of neritic sponges in La Guadeloupe National Park. Oceanol. Serie., 10:62-76 Alcolado, P.M. 1976. Lista de nuevos registros de Poriferos para Cuba.Serie Oceanológica. Instituto de Oceanologia. Academia de Ciencias de Cuba. Oceanologia, 36: 1-11. Anita G. Mary and Lazarus.2006. An account on the marine sponges of Gulf of Mannar. 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