Four new species of Ctenodrilus , Raphidrilus , and Raricirrus (Cirratuliformia, Annelida) in Japanese waters, with notes on their phylogenetic position

PeerJ

article

Naoto Jimi¹  Shinta Fujimoto³  Yoshihiro Fujiwara⁴  Kohei Oguchi⁵  Toru Miura⁶ 

[1] Sugashima Marine Biological Laboratory, Graduate School of Science, Nagoya University;Centre for Marine & Coastal Studies, Universiti Sains Malaysia;Research Center for Marine Biology, Graduate School of Life Sciences, Tohoku University;Research Institute for Global Change ,(RIGC), Japan Agency for Marine-Earth Science and Technology;National Institute of Advanced Industrial Science and Technology;Misaki Marine Biological Station, School of Science, The University of Tokyo

关键词: Annelida;    Japan;    New species;    Pacific Ocean;    Polychaeta;    Taxonomy;   

DOI  :  10.7717/peerj.13044

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Four new species of annelids, Ctenodrilus japonicus sp. nov., Raphidrilus misakiensis sp. nov., Raphidrilus okinawaensis sp. nov., and Raricirrus anubis sp. nov., are described based on specimens collected from Japanese waters. Ctenodrilus japonicus sp. nov. inhabits the interstitial environment and can be distinguished from the other congeners by the following features: (i) total of 16 chaetigers, (ii) chaetigers 1–3 with stout hooks, (iii) minute body (approximately 1 mm in length), (iv) all parapodia with the same number of chaetae (two notochaetae; two neurochaetae), and (v) presence of dorsal and ventral papillae. Raphidrilus misakiensis sp. nov. lives under intertidal stones and can be distinguished from other congeners by having pectinate neurochaetae. Raphidrilus okinawaensis sp. nov. inhabits the interstitial environment and can be distinguished from other congeners by: (i) absence of annulation on the peristomium and achaetous segment and (ii) presence of a heart body in chaetigers 4–5. Raricirrus anubis sp. nov. inhabits whale bones and can be distinguished from other congeners by the following features: (i) presence of a heart body in chaetigers 9–14, (ii) presence of capillary neurochaetae on chaetiger 1, and (iii) presence of simple curved spines. A phylogenetic tree based on partial sequences of cytochrome c oxidase subunit I and 16S rRNA from the new species and other cirratulid worms showed that Raphidrilus is included in Cirratuliformia. This is the first record of Raphidrilus and Raricirrus from Japanese waters.

【 授权许可】

CC BY