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: 862

    Authors' Institutions

    • Gunma Museum of Natural History


    member name taxa specimens media media
    MorphoBank Curator
    Project Administrator
    Last logged in 01/24/20
    Yoshikazu Hasegawa
    Full membership
    Last logged in Never
    Tosh Kimura
    Full membership
    Last logged in Never

    Project has no matrices defined.

    Project views

    type number of views Individual items viewed (where applicable)
    Total project views862
    Project overview187
    Documents list104
    Media views286Media search (247 views); M681752 (39 views);
    Specimen list114
    Views for media list66
    Taxon list62

    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project22
    Project downloads22