Abstract
A new species of dicyemid mesozoan is described from a cuttlefish Sepia latimanus Quoy and Gaimard collected off Nago, Naha and Onnason, Okinawa Islands, Ryukyu Islands, Japan. Dicyemennea ryukyuense n. sp. is a large species that reaches about 5 mm in length. The vermiform stage is characterised by 23 peripheral cells, a conical calotte and an axial cell that extends to the base of the propolar cells. The infusoriform embryo consists of 37 cells; two nuclei are present in each urn cell and the refringent bodies are solid. In the type of reproductive strategy, rhombogens of D. ryukyuense form a small number of infusorigens and produce a relatively large number of gametes per infusorigen. In the family Dicyemidae, Dicyemennea Whitman, 1883 is the largest group after Dicyema von Kölliker, 1849. Other dicyemid species, including those belonging to Dicyema, were not detected. Dicyemids have never previously been detected in cephalopods living on corals and rocks off the Ryukyu Islands, even though they are benthonic in habitat. This is the first report of a dicyemid mesozoan from S. latimanus and also from off the Ryukyu Islands. S. latimanus inhabits coral reefs, often swimming over the coral but usually lying on the sandy bottom. Dicyemids cannot possibly infect cephalopods which live exclusively over coral and rock.
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Acknowledgements
I should like to express my thanks to Dr Euichi Hirose of the University of the Ryukyus, Dr Tohru Iseto of the Kyoto University Museum and Ms Natsumi Kaneko of the University of the Ryukyus for their kind help in collecting cephalopod specimens. I should also like to express my gratitude to Dr Kazuhiko Tsuneki of Osaka University for his critical reading of the manuscript and valuable advice. This study was supported by grants from the Nakayama Foundation for Human Science, the Research Institute of Marine Invertebrates Foundation and the Japan Society for the Promotion of Science (research grant no. 14540645).
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Furuya, H. A new species of Dicyemennea Whitman, 1883 (Phylum Dicyemida) from Sepia latimanus (Mollusca: Cephalopoda: Decapodidae) off Okinawa, Japan. Syst Parasitol 65, 205–213 (2006). https://doi.org/10.1007/s11230-006-9048-4
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DOI: https://doi.org/10.1007/s11230-006-9048-4