[MARMAM] New publication: A New Species of the Genus Eschrichtius (Cetacea: Mysticeti) from the Early Pleistocene of Japan

Toshiyuki Kimura kimura at gmnh.pref.gunma.jp
Mon Jan 1 15:48:26 PST 2018


We are pleased to announce the publication of the following paper in the 
current issue of Paleontological Research:

A New Species of the Genus Eschrichtius (Cetacea: Mysticeti) from the 
Early Pleistocene of Japan

Toshiyuki Kimura, Yoshikazu Hasegawa and Naoki Kohno

doi:10.2517/2017PR007


Abstract. The family Eschrichtiidae is presently only represented by 
Eschrichtius robustus, a relict species from the North Pacific. Because 
of the scarcity of fossil records of the Eschrichtiidae, their 
evolutionary history is not well understood. A finely preserved 
mysticete skeleton was recovered from the Lower Pleistocene (1.77–1.95 
Ma) of Tokyo, Japan, in 1961. The fossil consists of a cranium, 
mandibles, cervical, thoracic, lumbar and caudal vertebrae, chevrons, 
ribs, and forelimb bones, including scapula, humerus, radius, ulna and 
digit bones. Here, we describe and diagnose this fossil as a new species 
of the Eschrichtiidae, Eschrichtius akishimaensis sp. nov. This is the 
first fossil species of the genus Eschrichtius and suggests that at 
least two lineages represented by the modern species of Eschrichtius and 
the new species described here survived as late as the Early 
Pleistocene. This expands our knowledge of the paleodiversity of the 
eschrichtiids.

Key words: Early Pleistocene, Eschrichtiidae, Eschrichtius 
akishimaensis, western North Pacific


Full text is available at:
http://www.bioone.org/doi/abs/10.2517/2017PR007

or upon e-mail request to kimura at gmnh.pref.gunma.jp

-- 
:>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Toshiyuki KIMURA, Ph.D.
Assistant Curator
Gunma Museum of Natural History
1674-1 Kamikuroiwa, Tomioka
Gunma 370-2345, Japan
tel: +81-274-60-1200
fax: +81-274-60-1250
e-mail: kimura at gmnh.pref.gunma.jp
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