Four new species of <i>Ctenodrilus</i>, <i>Raphidrilus</i>, and <i>Raricirrus</i> (Cirratuliformia, Annelida) in Japanese waters, with notes on their phylogenetic position
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- Naoto Jimi
- Sugashima Marine Biological Laboratory, Graduate School of Science, Nagoya University, Toba, Japan
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- Shinta Fujimoto
- Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University, Aomori, Japan
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- Yoshihiro Fujiwara
- Research Institute for Global Change (RIGC), Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Yokosuka, Japan
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- Kohei Oguchi
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan
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- Toru Miura
- Misaki Marine Biological Station, School of Science, The University of Tokyo, Miura, Japan
抄録
<jats:p>Four new species of annelids, <jats:italic>Ctenodrilus japonicus</jats:italic> sp. nov., <jats:italic>Raphidrilus misakiensis</jats:italic> sp. nov., <jats:italic>Raphidrilus okinawaensis</jats:italic> sp. nov., and <jats:italic>Raricirrus anubis</jats:italic> sp. nov., are described based on specimens collected from Japanese waters. <jats:italic>Ctenodrilus japonicus</jats:italic> sp. nov. inhabits the interstitial environment and can be distinguished from the other congeners by the following features: (<jats:italic>i</jats:italic>) total of 16 chaetigers, (<jats:italic>ii</jats:italic>) chaetigers 1–3 with stout hooks, (<jats:italic>iii</jats:italic>) minute body (approximately 1 mm in length), (<jats:italic>iv</jats:italic>) all parapodia with the same number of chaetae (two notochaetae; two neurochaetae), and (<jats:italic>v</jats:italic>) presence of dorsal and ventral papillae. <jats:italic>Raphidrilus misakiensis</jats:italic> sp. nov. lives under intertidal stones and can be distinguished from other congeners by having pectinate neurochaetae. <jats:italic>Raphidrilus okinawaensis</jats:italic> sp. nov. inhabits the interstitial environment and can be distinguished from other congeners by: (<jats:italic>i</jats:italic>) absence of annulation on the peristomium and achaetous segment and (<jats:italic>ii</jats:italic>) presence of a heart body in chaetigers 4–5. <jats:italic>Raricirrus anubis</jats:italic> sp. nov. inhabits whale bones and can be distinguished from other congeners by the following features: (<jats:italic>i</jats:italic>) presence of a heart body in chaetigers 9–14, (<jats:italic>ii</jats:italic>) presence of capillary neurochaetae on chaetiger 1, and (<jats:italic>iii</jats:italic>) presence of simple curved spines. A phylogenetic tree based on partial sequences of cytochrome <jats:italic>c</jats:italic> oxidase subunit I and 16S rRNA from the new species and other cirratulid worms showed that <jats:italic>Raphidrilus</jats:italic> is included in Cirratuliformia. This is the first record of <jats:italic>Raphidrilus</jats:italic> and <jats:italic>Raricirrus</jats:italic> from Japanese waters.</jats:p>
収録刊行物
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- PeerJ
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PeerJ 10 e13044-, 2022-03-08
PeerJ