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)
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Abstract

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.


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Article DOI: 10.1080/02724634.2019.1566739

Project DOI: 10.7934/P3573, http://dx.doi.org/10.7934/P3573
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MorphoBank Project 3573

    Authors' Institutions

    • Gunma Museum of Natural History



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    member name taxa specimens media media
    notes
    MorphoBank Curator
    Project Administrator
    Last logged in 01/24/20
    1110
    Yoshikazu Hasegawa
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    Tosh Kimura
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    Last logged in Never
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