PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Pseudotomus eugenei

Osteichthyes - Rodentia - Ischyromyidae

Taxonomy

Ischyrotomus eugenei was named by Burke (1935). Its type specimen is CM 11983, a mandible (both ami of lower jaw and fragment of LM3), and it is a 3D body fossil. Its type locality is West Fork of Antelope Draw, which is in an Uintan terrestrial horizon in the Uinta Formation of Utah.

It was recombined as Pseudotomus eugenei by Storer (1984), Dunn and Rasmussen (2007).

Entered

by J. Alroy on 2003-01-23; modified by J. Marcot on 2026-05-11

Synonymy list

Year	Name and author
1935	Ischyrotomus eugenei Burke p. 5 figs. Figure 1
1984	Pseudotomus eugenei Storer
2007	Pseudotomus eugenei Dunn and Rasmussen p. 988

Is something missing? Join the Paleobiology Database and enter the data

Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
class	Osteichthyes
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()

Rank	Name	Author
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Euarchontoglires	Murphy et al. 2001
—	Gliriformes	Wyss and Meng 1996
—	Glires	()
—	Simplicidentata	()
order	Rodentia
family	Ischyromyidae	Alston 1876
subfamily	Paramyinae	Simpson 1945
tribe	Manitshini	Simpson
genus	Pseudotomus
species	eugenei	()

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Pseudotomus eugenei Burke 1935

show all | hide all

Diagnosis

Reference	Diagnosis
J. J. Burke 1935	Incisor flattened and jaw generally much as in Ischryotomus petersoni Matthew, but a much larger species (length of cheek tooth row of holotype circa 31 mm.) ; jaw more robust throughout and diastema relatively shorter.

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingg

Diet:

herbivoreo

Reproduction:

viviparoussubc

Created:

2011-05-12 18:22:11

Modified:

2011-05-12 03:22:11

Source: g = genus, o = order, subc = subclass, c = class, subp = subphylum

References: Nowak 1999, Hendy et al. 2009, Carroll 1988, Ji et al. 2002, Lillegraven 1979, Dunn and Rasmussen 2007

Age range: Late/Upper Uintan or 45.90000 to 39.70000 Ma

Collections (5 total)

Time interval	Ma	Country or state	Original ID and collection number
Late/Upper Uintan	45.9 - 39.7	USA (Utah)	Ischyrotomus eugenei (type locality: 109171) Pseudotomus eugenei (109166 109167)
Late/Upper Uintan	45.9 - 39.7	Canada (Saskatchewan)	Pseudotomus eugenei (16626)
Uintan	45.9 - 39.7	USA (Utah)	Ischyrotomus eugenei (16607)