Abstract
Pharyngocirrus gabriellae (Du Bois-Reymond Marcus 1946) and Saccocirrus pussicus Du Bois-Reymond Marcus 1948 are redescribed based on newly collected material from the south and southeastern Brazilian coasts. Neotypes are designated, since no type material was formally indicated in the original descriptions. New morphological information on the muscular ventral pharynx, ciliation, chaetae and pygidium is provided. Pharyngocirrus gabriellae is additionally characterised by the presence of mouth ciliary patches, capillary lyrate chaetae with a single median tooth and equally bifid medium chaetae with denticulate prongs. The novel diagnostic characters of Saccocirrus pussicus include the absence of a pharynx and the presence of 1–3 pygidial, adhesive ridges and 20 fertile segments. The two species live in very distinct interstitial habitats, with varying hydrodynamics. Pharyngocirrus gabriellae is found at sheltered intertidal and shallow areas in sediments with a redox layer, whereas Saccocirrus pussicus prefers the swash zone of exposed, oxygenated, reflective beaches. Morphology and habitat preferences of P. gabriellae and S. pussicus are consistent with other Saccocirridae species from the ‘Pharyngocirrus’ and ‘Saccocirrus’ genera, respectively.
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Acknowledgments
We thank Alexandra Rizzo, Alvaro E. Migotto, Carlos Barboza, Cinthya S.G. Santos, Fabiane Gallucci, Gustavo Fonseca, Rômulo Barroso, and Tito C. M. Almeida for their generous help, advice and logistic support in the field trips. Alessandro L. Prantoni, André Pereira Cattani, Reginaldo Nunes and Veronica Oliveira were most helpful during field sampling. We thank our colleagues, technicians and staff of the Marine Biological Section and Natural History Museum of Denmark, University of Copenhagen for their generous help and advice. We further thank Greg W. Rouse and Katharina Jörger for providing comparative material from Australia and Thailand, respectively. This study was supported by the Brazilian National Council for Technological and Scientific Development (CNPq—Process 140611/2008-8), which provided the Ph.D. fellowship for M.D.D. São Paulo Research Foundation (FAPESP—Process 2012/08581-0, Process 2013/04358-7) provided postdoctoral fellowships and grants for M.D.D. We are highly indebted to Dr. Jon Norenburg, Kathryn Ahlfeld and Cheryl Bright, from the National Museum of Natural History/Smithsonian Institute, Washington DC, for kindly hosting M.D.D. at the museum to check the relevant type material of Saccocirrus spp and Pharyngocirrus spp.
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Di Domenico, M., Martínez, A., Amaral, A.C.Z. et al. Saccocirridae (Annelida) from the southern and southeastern Brazilian coasts. Mar Biodiv 44, 313–325 (2014). https://doi.org/10.1007/s12526-014-0208-5
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DOI: https://doi.org/10.1007/s12526-014-0208-5