Phylogenetic position of a deep-sea ascidian, Megalodicopia hians, inferred from the molecular data |
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Authors: | Kurabayashi Atsushi Okuyama Makiko Ogawa Mari Takeuchi Akira Jing Zhang Naganuma Takeshi Saito Yasunori |
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Institution: | Department of Biology, Keio University, Hiyoshi, Yokohama, Kanagawa, Japan. kuraba@hiroshima-u.ac.jp |
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Abstract: | Ascidians inhabit both shallow water and the deep sea. The phylogenetic position of deep-sea ascidians has not been sufficiently investigated because of their unusual habitats. The family Octacnemidae is one such enigmatic deep-sea ascidian. In this report, we determined the sequences of the 18SrDNA and a mitochondrial protein gene of Megalodicopia hians belonging to the family Octacnemidae, and we analyzed its phylogenetic relationship with other ascidians. A phylogenetic relationship of this family with the families Cionidae and/or Corellidae has been suspected based on a small number of morphological characteristics. However, our results suggested that M. hians has a close relationship to the family Corellidae and might originate from them. This is the first report of the molecular phylogenetic analysis of a deep-sea ascidian. |
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