Tanaka Yoshihiro, Ando Tatsuro, Sawamura Hiroshi
Osaka Museum of Natural History, Osaka, Japan.
Hokkaido University Museum, Sapporo, Japan.
PeerJ. 2018 Jun 26;6:e4934. doi: 10.7717/peerj.4934. eCollection 2018.
A fossil whale from the Hikatagawa Formation (Middle Miocene, 15.2-11.5 Ma) of Hokkaido, Japan is described as a new genus and species and its phylogenetic position is examined. Consistent with the result of Marx, Lambert & de Muizon (2017), the Cetotheriidae form a clade with the Balaenopteroidea, and "a clade comprising and related taxa" is located basal to the Balaenopteroidea + Cetotheriidae clade. is placed in the clade with most of members of "Cetotheres" sensu lato comprising and related taxa. can be distinguished from the other members of "Cetotheres" sensu lato in having an anteriorly swollen short zygomatic process, high triangular coronoid process, and angular process, which does not reach as far posterior as the mandibular condyle. is only record of "Cetotheres" sensu lato from Hokkaido, Japan and the northern-most records of "Cetotheres" sensu lato in Japan.
描述了来自日本北海道日高川组（中新世中期，1520 - 1150万年前）的一头化石鲸，将其定为一个新属新种，并对其系统发育位置进行了研究。与马克思、兰伯特和德米宗（2017年）的结果一致，须鲸科与须鲸超科形成一个分支，且“一个包含[具体物种]及相关类群的分支”位于须鲸超科 + 须鲸科分支的基部。[新物种名称]与广义“须鲸类”的大多数成员一同被置于该分支中，广义“须鲸类”包含[具体物种]及相关类群。[新物种名称]可通过以下特征与广义“须鲸类”的其他成员区分开来：颧骨突短且向前膨隆、冠状突高且呈三角形、角突未延伸至下颌髁突后方那么远。[新物种名称]是日本北海道广义“须鲸类”的唯一记录，也是日本广义“须鲸类”最北的记录。
