A new Eocene rodent from the lower Arshanto Formation in the Nuhetingboerhe (Camp Margetts) area, Inner Mongolia

Title Variants

Alternative: New Eocene rodent family

Related Titles

Series: American Museum novitates, no. 3569

By

Meng, Jin (Paleontologist)
Li, Chuan-Kuei.
Ni, Xijun (Paleontologist)
Wang, Yuanqing (Paleontologist)
Beard, K. Christopher

Type

Book

Material

Published material

Publication info

New York, NY American Museum of Natural History c2007

Notes

Title from caption.

"May 16, 2007."

A new miniscule rodent represented by isolated cheek teeth is reported from the lower part of the late early Eocene Arshanto Formation, Nuhetingboerhe (Camp Margetts) area, Inner Mongolia. A new family, based on the new genus and species, is proposed. The new taxon resembles alagomyids but differs from early rodents in having a partial buccal cingulum, a distinct metaconule that merges posteriorly with the postcingulum, a transversely oriented trigon basin that widely separates the paracone and metacone, a prominent hypoconulid on lower molars, and in lacking the hypocone and protocristid. It differs from alagomyids in having a greater length/width ratio of upper cheek teeth, a neomorphic cusp termed as the preprotoconule, a preprotoconule crista that projects anteriorly, an anteroconid on dp4, an oblique cristid obliqua bearing a distinct mesoconid, and the hypoconid more posteriorly extended (or hypoconulid less posteriorly extended) on m3. The dental morphology of the new taxon is derivable from analagomyid dental pattern and is intermediate between alagomyids and rodents of modern aspect; it casts new light on the evolution of dentition of early rodents.

Subjects

Archetypomys erlianensi , China , Eocene , Inner Mongolia , Mammals, Fossil , Paleontology , Rodents, Fossil , Teeth, Fossil

Call Number

QL1 .A436 no.3569 2007

Language

English

Identifiers

DOI: https://doi.org/10.1206/0003-0082(2007)536[1:ANERFT]2.0.CO;2
OCLC: 133121533