A new species of Middle Miocene baleen whale from the Nupinai Group, Hikatagawa Formation of Hokkaido, Japan

PeerJ

卷:6

Tatsuro Ando¹  Hiroshi Sawamura¹  Yoshihiro Tanaka² 

[1] Ashoro Museum of Paleontology, Hokkaido, Japan;

[2] Osaka Museum of Natural History, Osaka, Japan;

关键词: Fossil;    Baleen whale;    New genus;    New species;    Mysticeti;   

DOI  :  10.7717/peerj.4934

来源: DOAJ

【 摘 要 】

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 Taikicetus inouei 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 Isanacetus, Parietobalaena and related taxa” is located basal to the Balaenopteroidea + Cetotheriidae clade. Taikicetus inouei is placed in the clade with most of members of “Cetotheres” sensu lato comprising Isanacetus, Parietobalaena and related taxa. Taikicetus inouei 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. Taikicetus inouei is only record of “Cetotheres” sensu lato from Hokkaido, Japan and the northern-most records of “Cetotheres” sensu lato in Japan.

【 授权许可】

Unknown