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Revision of the Wind River faunas, early Eocene of central Wyoming. IX - The oldest known hystricomorphous rodent (Mammalia: Rodentia)The rostral portion of the skull of a new genus and species of rodent, Armintomys tullbergi, from the earliest middle Eocene of the Wind River Basin (Wyoming) provides the geologically oldest known record of the hystricomorphous zygomasseteric structure. Armintomys also preserves the oldest known occurrence of incisor enamel that is transitional from pauciserial to uniserial. Other dental characters include: anteriorly grooved incisor, small premolars, and relatively primitive sciuravidlike molars. Analysis of this unique combination of characters implies that Armintomys is the oldest known myomorph rodent and the only known representative of a new family. Armintomyidae, which is referred, with question, to the myomorph superfamily Dipodoidea. Armintomys is more primitive, especially in premolar retention and structure, than the Bridgerian zapodid Elymys from Nevada, but adds to evidence from the latter for an early origin and radiation of dipodoid rodents.
Document ID
19930060906
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dawson, Mary R.
(NASA Headquarters Washington, DC United States)
Krishtalka, Leonard
(NASA Headquarters Washington, DC United States)
Stucky, Richard K.
(Denver Museum of Natural History CO, United States)
Date Acquired
August 16, 2013
Publication Date
June 8, 1990
Publication Information
Publication: Carnegie Museum of Natural History, Annals
Volume: 59
Issue: 2
ISSN: 0097-4463
Subject Category
Life Sciences (General)
Accession Number
93A44903
Funding Number(s)
CONTRACT_GRANT: NSF BSR-84-02051
CONTRACT_GRANT: NAGW-949
CONTRACT_GRANT: NSF BSR-87-09242
Distribution Limits
Public
Copyright
Other

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