Project 3573: T. Kimura, Y. Hasegawa. 2019. A new species of Kentriodon (Cetacea, Odontoceti, Kentriodontidae) from the Miocene of Japan. Journal of Vertebrate Paleontology. 39 (1):e1566739.
Specimen: † Kentriodon (unvouchered)
View: drawing


Kentriodontids are small- to medium-sized odontocetes with a wide geographic range that flourished during the Miocene. They are closely related to crown Delphinida. Seven fossil kentriodontid specimens have been recovered from the Haraichi Formation, Annaka Group (latest middle/earliest late Miocene, Serravallian/Tortonian), Gunma Prefecture, Japan. We describe and diagnose a new species of the genus Kentriodon. Kentriodon nakajimai, sp. nov., has a larger fossa for the hamular and preorbital lobes of the pterygoid sinuses, which suggests that the species was more highly adapted for diving than other Kentriodon species. Asymmetric development of left and right maxillary crests indicates asymmetric development of the facial muscles attached to the melon. If this is the case, it suggests that K. nakajimai possessed a more sophisticated echolocation system than other kentriodontids. Phylogenetic analysis suggests that K. nakajimai is most closely related to K. obscurus and the genus Kentriodon may have originated in the Pacific and then dispersed into the Atlantic several times.

Read the article »

Article DOI: 10.1080/02724634.2019.1566739

Project DOI: 10.7934/P3573,
This project contains
  • 1 Media
  • 2 Documents
  • 1 Taxon
  • 1 Specimen
Total size of project's media files: 18.19k

Download Project SDD File
Currently Viewing:
MorphoBank Project 3573
  • Creation Date:
    01 November 2019
  • Publication Date:
    24 January 2020
  • Project views: 3271

    Authors' Institutions

    • Gunma Museum of Natural History


    member name taxa specimens media media
    MorphoBank Curator
    Project Administrator
    Yoshikazu Hasegawa
    Full membership
    Tosh Kimura
    Full membership

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views3271
    Project overview499
    Documents list309
    Media views1102Media search (934 views); M681752 (168 views);
    Specimen list529
    Views for media list322
    Taxon list309

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project96
    Project downloads96