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Redescription of †Yanosteus longidorsalis Jin et al., 1995 (Chondrostei, Acipenseriformes, †Peipiaosteidae) from the Early Cretaceous of China

Published online by Cambridge University Press:  08 October 2020

Eric J. Hilton Open the ORCID record for Eric J. Hilton [Opens in a new window] ,
Lance Grande  and
Fan Jin
Eric J. Hilton
Affiliation:
Virginia Institute of Marine Science, William & Mary, 1357 Greate Road, Gloucester Point, Virginia 23062, USA
Lance Grande
Affiliation:
The Field Museum, 1400 South Lake Shore Drive, Chicago, Illinois 60605, USA
Fan Jin
Affiliation:
Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, P.R. China
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Abstract

The family †Peipiaosteidae contains the genera †Peipiaosteus, †Stichopterus, †Spherosteus, †Yanosteus, and †Liaosteus, all from Late Jurassic to Early Cretaceous deposits of China, Russia, Kazakhstan, and Mongolia. Although the family has taxonomically expanded since it was first established for †P. pani Liu and Zhou, 1965, the amount of detailed comparative data for many of the taxa involved is lacking. In this paper, we describe the osteology of the monotypic genus †Yanosteus from the Yixian Formation (Early Cretaceous) of China largely on the basis of a newly prepared, well-preserved specimen. †Yanosteus is characterized by a series of infraorbital ossicles (a characteristic of the family), a broad, rounded palatopterygoid, a robust dentary, an extremely small opercle and a subopercle with distinctly long and rounded anterior process and a posteriorly scalloped margin, a broad and weakly forked caudal fin, an elongate dorsal fin with more than 160–178 fin rays (diagnostic for the genus), and a short but well-formed pectoral fin spine. We use the results of this study to discuss the characters of the †Peipiaosteioidei and the diversity of †peipiaosteioids.

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Journal of Paleontology , Volume 95 , Issue 1 , January 2021 , pp. 170 - 183
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Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society

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