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A new member of fossil balaenid (Mysticeti, Cetacea) from the early Pliocene of Hokkaido, Japan
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| Title: | A new member of fossil balaenid (Mysticeti, Cetacea) from the early Pliocene of Hokkaido, Japan |
| Authors: | Tanaka, Yoshihiro Browse this author →ORCID | | Furusawa, Hitoshi Browse this author | | Kimura, Masaichi Browse this author |
| Keywords: | Balaenidae | | new genus and species | | Zanclean | | Balaenula balaenopsis | | supramastoid crest |
| Issue Date: | 22-Apr-2020 |
| Publisher: | Royal Society |
| Journal Title: | Royal Society Open Science |
| Volume: | 7 |
| Issue: | 4 |
| Start Page: | 192182 |
| Publisher DOI: | 10.1098/rsos.192182 |
| Abstract: | The family Balaenidae includes two genus and four extant species. Extinct balaenids are known for at least four genus and 10 species. The oldest known record of members of the Balaenidae is known from the early Miocene, but still need more early members of the family to provide better phylogenetic hypotheses. FCCP 1049 from the lower part of the Chippubetsu Formation, Fukagawa Group (3.5–5.2 Ma, Zanclean, early Pliocene) was preliminary described and identified as Balaenula sp. by Furusawa and Kimura in 1982. Later works discussed that FCCP 1049 is different from the genus, and is placed in different clade from Balaenula astensis. The result of our phylogenetic analysis places FCCP 1049 basal to Balaenella brachyrhynus,andisagain separated from B. astensis. In this study, FCCP 1049 is re-described and named as Archaeobalaena dosanko gen. et sp. nov. Archaeobalaena dosanko is distinguishable from other balaenids by having a deep promontorial groove of the pars cochlearis of the periotic. Archaeobalaena dosanko can be differentiated from other balaenids, except Morenocetus parvus by having a slender zygomatic process, and posteriorly oriented postorbital process in dorsal view. Archaeobalaena dosanko adds detailed skull, periotic and bulla morphologies for the earlier balaenids. |
| Rights: | © 2020 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited. | | http://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/90470 |
| Appears in Collections: | 総合博物館 (The Hokkaido University Museum) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 田中 嘉寛
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