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The jaw apparatus of the Late Cretaceous heteromorph ammonoid Pravitoceras

Published online by Cambridge University Press:  29 October 2015

Kazushige Tanabe ,
Yasuyuki Tsujino ,
Kosuke Okuhira  and
Akihiro Misaki
Kazushige Tanabe
Affiliation:
Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan, 〈tanabe@um.u-tokyo.ac.jp〉
Yasuyuki Tsujino
Affiliation:
Tokushima Prefectural Museum, Tokushima City, Tokushima 770-8070, Japan, 〈tsujino-yasuyuki-1@mt.tokushima-ec.ed.jp〉
Kosuke Okuhira
Affiliation:
Tokushima Prefectural Museum, Tokushima City, Tokushima 770-8070, Japan, 〈tsujino-yasuyuki-1@mt.tokushima-ec.ed.jp〉
Akihiro Misaki
Affiliation:
Kitakyushu Museum of Natural History and Human History, Kitakyushu City, Fukuoka 805-0071, Japan, 〈misaki_a@kmnh.jp〉
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Abstract

Well-preserved upper and lower jaws of the aptychus-type found inside the body chambers of two specimens of the heteromorph ammonoid Pravitoceras sigmoidale Yabe, 1902 (Nostoceratidae, Ancyloceratina) are described from the Upper Cretaceous Izumi Group in Southwest Japan. They are similar in overall morphology to those of other nostoceratid and diplomoceratid ammonoids currently known, suggesting the morphological stability of the jaw features among these taxa. The equal size of the upper and lower jaws with beak-like rostral projection suggests that the jaw apparatus of this species might function to bite and cut up prey.

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Articles
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Journal of Paleontology , Volume 89 , Issue 4 , July 2015 , pp. 611 - 616
Copyright
Copyright © 2015, The Paleontological Society 

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