著者
KAJIHARA Hiroshi
出版者
Seto Marine Biological Laboratory, Kyoto University
雑誌
Publications of the Seto Marine Biological Laboratory (ISSN:00372870)
巻号頁・発行日
vol.43, pp.92-102, 2015-09-15

A new species of heteronemertean with branched proboscis, Gorgonorhynchus albocinctus sp. nov., is described based on the external feature and DNA sequences from a specimen collected subtidally among coral rubbles at a depth of about 6 m in a reef area around Taketomi Island in the Yaeyama Islands, southwestern Japan. It can be classified in the genus because the mode of proboscis branching is dichotomous, rather than alternating laterally. From the two known congeners G. repens Dakin and Fordham, 1931 and G. bermudensis Wheeler, 1940, the new species can be differentiated by having a brown body colour with a white band near the tip of the head. The new species is placed in a molecular phylogenetic context with a maximum-likelihood analysis using the nuclear 18S rRNA and 28S RNA genes, as well as the mitochondrial cytochrome c oxidase subunit I gene, together with 20 species of heteronemerteans, for which those sequences were available in the public databases. The results indicate that G. albocinctus is closely related to Cerebratulus leucopsis (Coe, 1901), a species that is supposed to have a non-branched proboscis.

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2 2 https://t.co/I6CZ5VprFY
@ninnniku_ 基本的にヒモムシの吻は筋肉の収縮による内圧によって外転します(引っ込むときは牽引筋)。これも同じ仕組みかと思います。 ゴルゴノリンクスの吻の構造の資料があったのでドーゾ↓ https://t.co/v15OdMhJJo

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