Narrow dolphin mandibles with an elongate mandibular symphysis from the Oi Formation, Ichishi Group (late early Miocene) of Tsu City, Mie Prefecture, Japan is reported. The specimen shows different morphologies from “Eurhinodelphis” minoensis and Ninjadelphis ujiharai, which were reported from late early Miocene sediments of the same region. This new record expands our knowledge of lower Miocene odontocetes from Japan and indicates that at least three odontocetes are represented in the Mizunami and Ichishi Groups.
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1 January 2021
A Fossil Dolphin from the Oi Formation, Ichishi Group (Late Early Miocene) in Japan
Yoshihiro Tanaka,
Masaaki Ohara,
Toshiyuki Kimura
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Paleontological Research
Vol. 25 • No. 1
January 2021
Vol. 25 • No. 1
January 2021
Burdigalian
Cetacea
lower jaw
mandibular symphysis
Miocene
Odontoceti