Propalaeocastor (Rodentia, Mammalia) from the early Oligocene of Burqin Basin, Xinjiang

Title Variants

Alternative: Propalaeocastor from China

Related Titles

Series: American Museum novitates, no. 3461

By

Wu, Wenyu.
Meng, Jin (Paleontologist)
Ye, Jie.
Ni, Xijun (Paleontologist)

Type

Book

Material

Published material

Publication info

New York, NY American Museum of Natural History c2004

Notes

Title from caption.

"December 30, 2004."

A new species of castorids, Propalaeocastor irtyshensis, n.sp., from the Burqin Basin of Xinjiang Uygur Autonomous Region, China, is described. The new species, represented by a right maxilla with well-preserved P4-M3, is the earliest and northernmost occurrence of castorids in China. It is characterized mainly by the cheek tooth crown being higher than that of P. butselensis but lower than that of Steneofiber aff. dehmi (probably a new species of Propalaeocastor), and by lingual confluence of the mesoflexus to the lingual fossette of the premesoflexus. Comparison with known species previously assigned to Steneofiber from Europe and Kazakhstan leads to the conclusion that the early Oligocene forms previously assigned to the genus, such as "S. butselensis" and "S. kazachstanicus", differ significantly from those represented by S. eseri from the late Oligocene and early Miocene of Europe. We consider Propalaeocastor a valid genus, provide an emended diagnosis for it, and discuss its evolutionary trend in relation to Steneofiber. Preliminary analysis of Burqin fauna suggests an age of early early Oligocene. Faunal transformations across the Eocene-Oligocene boundary in the Burqin region are comparable to those of Europe and the Mongolian Plateau and suggest linkage of faunal turnovers and global climate changes.

Subjects

Beavers, Fossil , China , Mammals, Fossil , Oligocene , Paleontology , Propalaeocastor irtyshensis , Xinjiang Uygur Zizhiqu

Call Number

QL1 .A436 no.3461 2004

Language

English

Identifiers

DOI: https://doi.org/10.1206/0003-0082(2004)461<0001:PRMFTE>2.0.CO;2
OCLC: 57402073