A Unique Rodent Fauna from the Whitneyan (Middle Oligocene) of Southwestern Montana

Autor:	Alan R. Tabrum, William W. Korth
Rok vydání:	2017
Předmět:	0106 biological sciences 010506 paleontology Rodent biology Fauna Zoology Geology 010603 evolutionary biology 01 natural sciences Paleontology Type species Geography biology.animal Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences
Zdroj:	Annals of Carnegie Museum. 84:319-340
ISSN:	1943-6300 0097-4463
DOI:	10.2992/007.084.0401
Popis:	Nine rodents are described from the Whitneyan (middle Oligocene) White Hills fauna of Montana. Of these, three new genera are described: the aplodontid Altasciurus, the cylindrodontid Lophicylindrodon, and the castorid Montanacastor. Prosciurus relictus (Cope, 1873) is named as the type species of Altasciurus. The other genera are unique to this fauna and are based on new species; Lophicylindrodon expiratus and Montanacastor simplicidens. In addition, two more new species are described: the eomyid Orelladjidaumo exiguus and the cricetid Willeumys argosorus. The rodent fauna from White Hills is believed to be Whitneyan in age because of the occurrence of Eumys brachyodus Wood, 1937, and Leptodontomys douglassi (Burke, 1934); both elsewhere known from the Whitneyan. The rodent fauna is unique for several reasons: 1) a much lower diversity of rodents than in comparably aged faunas; 2) the number of unique species (four of nine); 3) the relict occurrence of a cylindrodontid (otherwise latest occurren...
Databáze:	OpenAIRE
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