Takumiya Mikio, Kobayashi Mari, Tsuneki Kazuhiko, Furuya Hidetaka
Department of Biology, Graduate School of Science, Osaka University, Japan.
Zoolog Sci. 2005 Feb;22(2):147-55. doi: 10.2108/zsj.22.147.
Phylogenetic relationships among 36 species of major coleoid cephalopods from Japanese waters were studied using partial sequences of three mitochondrial genes, 16S rDNA, 12S rDNA, and cytochrome c oxidase subunit I gene. Octopoda and Decapoda were monophylic groups. Within Sepioidea, Sepiadariidae and Sepiolidae were not closely related to Sepiidae, but rather related to Teuthoidea. Sepiidae with a distinct calcareous shell formed a single cluster. Myopsida was closely related to Oegopsida. Within Octopoda, Opisthoteuthis depressa and Argonauta argo diverged earlier than Octopodiidae. The common octopuses in Japanese waters were separated into three clusters. The first cluster occupied a basal position, and includes large-sized octopuses, such as Enteroctopus dofleini and Octopus (Paroctopus) conispadiceus from the continental shelf and upper slope. The second cluster consisted of long-armed octopuses, such as O. ornatus, O. minor, and O. sasakii. The third cluster contained small- to medium-sized octopus, such as Amphioctopus fangsiao, A. areolatus, O. cyaneus, and O. vulgaris, in which several species possess ocelli on the web. The second cluster formed the sister group to the third cluster.
利用线粒体的16S rDNA、12S rDNA和细胞色素c氧化酶亚基I基因的部分序列，研究了日本海域36种主要头足类动物的系统发育关系。八腕目和十腕目为单系类群。在乌贼目中，耳乌贼科和枪乌贼科与乌贼科的关系并不密切，而是与柔鱼目相关。具有独特钙质外壳的乌贼科形成一个单独的类群。闭眼亚目与开眼亚目关系密切。在八腕目中，谷蛸和毯子章鱼比蛸科分化得更早。日本海域的常见章鱼被分为三个类群。第一个类群处于基部位置，包括大型章鱼，如来自大陆架和上斜坡的北太平洋巨型章鱼和皮氏章鱼。第二个类群由长臂章鱼组成，如丽蛸、长蛸和佐氏蛸。第三个类群包含中小型章鱼，如短蛸、网纹蛸、蓝环章鱼和真蛸，其中几个物种在腕间膜上有眼斑。第二个类群是第三个类群的姐妹群。
