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Leocratides (Annelida: Hesionidae) from the Pacific Coast of Middle Honshu, Japan, with a Description of Leocratides kimuraorum sp. nov.
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Abstract
A new species of hesionid polychaetes, Leocratides kimuraorum sp. nov., is described based on material collected from the Shima Peninsula and Sagami Bay (middle Honshu, Japan), as well as museum specimens collected from Sagami Bay, Suruga Bay, and Shirahama. Leocratides kimuraorum sp. nov. is the third species in this genus and can be discriminated from the two congeners, L. filamentosus
Ehlers, 1908
and L. ehlersi (
Horst, 1921
), by i) the length of the antennae, which are as long as palps, ii) the presence of pharyngeal terminal papillae, and iii) the absence of a papillose peristomial membrane. On the other hand, L. filamentosus, originally described from off Western Sumatra, Indonesia, was also collected from Sagami Bay, and represents a new record of this species for Japanese waters. Partial mitochondrial cytochrome c oxidase subunit I gene sequences from the holotype of L. kimuraorum sp. nov. and newly collected specimen of L. filamentosus are provided for reliable species identification in the future.
Received 29 3月 2017
Accepted 13 6月 2017
Acknowledgments:
NJ is grateful for all their help in collecting the specimens to the captain and crew of the TRV Seisui-maru, Dr. Taeko Kimura, Mr. Shoichi Kimura, and Ms. Haruka Onishi (Mie University), Mr. Akito Ogawa (The University of Tokyo), Ms. Luna Yamamori (Kyoto University), and the member of the Marine Ecology Laboratory and other students of Mie University who participated the research cruise, Dr. Akira Asakura (Kyoto University), Dr. Katsumi Miyazaki (Niigata University), Dr. Masanori Okanishi (Ibaraki University), Dr. Asuka Sentoku (The University of Queensland), the member of the Shirahama Marine Research and crew of the R/V Janthina (Kyoto University). MT is indebted to Drs. Teruaki Nishikawa (Toho University) and Hiroshi Namikawa (NSMT) for giving him chance to participate their faunal survey in Sagami Bay, during which some specimens were found. We thank Drs. Hiroshi Namikawa and Hironori Komatsu (NSMT) for loan or searching of specimens under their care; Messrs. Mamoru Sekifuji, Hisanori Kohtsuka, and Dr. Akihito Omori (The University of Tokyo), Dr. Hiroaki Nakano and Mr. Yasutaka Tsuchiya (University of Tsukuba), and all the other participants in the 12th Japanese Association for Marine Biology (JAMBIO) Coastal Organism Joint Survey held at Misaki, for generous help in collecting additional material; Dr. Kevin Wakeman (Hokkaido University) for correcting the English; and Dr. Sergio I. Salazar-Vallejo and an anonymous reviewer for providing informative comments. This study was partly supported by JAMBIO.
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