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Class Mammalia
Order Rodentia
Family Cricetidae
Subfamily Neotominae
Genus Neotoma


Neotoma fossilis (Gidley 1922)—Fossil WoodratRegional Pleistocene distribution of Neotoma fossilis

Gidley (1922) described this species from the Benson beds of Arizona:

Description.—Length of anterior cheek tooth 3.2 millimeters; width 2.2 millimeters; about the size of N. intermedia gilva. The following characters distinguished this from all living species: First upper cheek tooth relatively short and wide; no indication of an· anterior internal reentrant valley; posterior internal reentrant valley nearly as long as the the external one; posterior notch of anterior palatial opening opposite the anterior: root of the first cheek tooth.
The two lower teeth referred to this species also show distinctive characters. The anterior one (p4) is entirely devoid of the anterior reentrant valley so prominent in such a form as N. cinera [sic!], and both these teeth are like the· corresponding ones of this species in having the posterior external reentrant valleys pitted in a way to form a nearly circular enamel lake in well-worn teeth. These lower teeth differ from those of all living species in having the main cross lophs directed somewhat obliquely inward and backward instead of squarely across the long axis of the tooth.
The lower-jaw specimen shows nothing peculiar except that the capsular bulb at the base of the incisor is somewhat less prominent than is usual in the living species.


Late Blancan: Jack Rabbit Trail, San Timoteo Badlands (Albright 2000).

Literature. Albright 2000; Gidley 1922.


Last Update: 13 Jul 2014