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A New Sciuravid Rodent (Mammalia) from the Early Eocene (Bridgerian) and the Sciuravid-Eomyid Transition
- Source :
- Annals of Carnegie Museum. 86:197
- Publication Year :
- 2020
- Publisher :
- Carnegie Museum of Natural History, 2020.
-
Abstract
- A new genus and species of sciuravid rodent, Perasciuravus mcintoshi, is named from the late Bridgerian (early Eocene) of the Washakie Formation, southcentral Wyoming. The most distinguishing characters of the species (and genus) are that it retains the primitive condition of the zygomasseteric structure for rodents, characteristic of sciuravids, but has a more specialized dental morphology of the cheek teeth (complete ectolophids and hypolophids on the lower molars; complete metalophs and protolophs on the upper molars) typical of the later-occurring family of geomyoid rodents, the Eomyidae. Perasciuravus is viewed as morphologically transitional between the Sciuravidae and the Eomyidae. Its occurrence also overlaps the temporal range of the Sciuravidae (Wasatchian [early Eocene] to Duchesnean [early-late Eocene]) and predates the first occurrence of the Eomyidae (Uintan [middle Eocene]).
- Subjects :
- 0106 biological sciences
010506 paleontology
Eomyidae
Rodent
Range (biology)
Geology
Biology
biology.organism_classification
010603 evolutionary biology
01 natural sciences
Paleontology
Genus
biology.animal
Cheek teeth
Ecology, Evolution, Behavior and Systematics
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 00974463
- Volume :
- 86
- Database :
- OpenAIRE
- Journal :
- Annals of Carnegie Museum
- Accession number :
- edsair.doi...........9447b7e9b3cd242900ead4035163b568