2025-04-09 北海道大学
<関連情報>
- https://www.hokudai.ac.jp/news/pdf/250409_pr2.pdf
- https://www.jstage.jst.go.jp/article/prpsj/29/0/29_240013/_article
北海道の蝦夷層群上部白亜系函淵層から見つかったゾウギンザメ科の新種カロリンクス・オリエンタリス Callorhinchus orientalis sp. nov., a new callorhinchid from the Upper Cretaceous Hakobuchi Formation, Yezo Group, Hokkaido, Japan
Akira Ota , Tomohiro Nishimura, Yoshitsugu Kobayashi, Kazunori Moriki
Paleontological Research Released on J-STAGE: March 31, 2025
DOI:https://doi.org/10.2517/prpsj.240013
Abstract
Herein, we describe Callorhinchus orientalis sp. nov., an extinct callorhinchid chondrichthyan species found in the lower Maastrichtian deposits of the Hakobuchi Formation in Hobetsu, Hokkaido, northern Japan. This species is the first record of the genus Callorhinchus from the northern Pacific region, filling the biogeographical gap and implying survival beyond the Cretaceous/Paleogene extinction event because of the broad distribution of the genus. A comparison of Maastrichtian Callorhinchus species, including C. orientalis sp. nov., and Danian species indicates a potential period of temporal dwarfing within the genus across this extinction event.
ZooBank registration: urn:lsid:zoobank.org:pub:7ED050DB-7A04-4999-9CA9-8E04E0B5AA56
