PBDB Taxon

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

Ischyromys typus

Mammalia - Rodentia - Ischyromyidae

Taxonomy

Ischyromys typus was named by Leidy (1856) [genotype]. It is a 3D body fossil. It is the type species of Ischyromys.

Subspecies

I. lloydi

Synonyms

Ischyromys typus lloydi was named by Troxell (1922).

It was considered an invalid subgroup of Ischyromys typus by Heaton (1996).
Colotaxis cristatus was named by Cope (1873).

It was recombined as Ischyromys cristatus by Matthew (1910); it was synonymized subjectively with Ischyromys typus by Cope (1875), Hay (1902), Matthew (1903), Troxell (1922), Wood (1937), Howe (1966), Black (1968), Wood (1980) and Heaton (1996).
Gymnoptychus chrysodon was named by Cope (1873) [genotype; also said to be 1872].

It was recombined as Ischyromys chrysodon by Cope (1873); it was synonymized subjectively with Ischyromys cristatus by Matthew (1910); it was synonymized subjectively with Ischyromys typus by Cope (1875), Hay (1899), Hay (1902), Troxell (1921), Wood (1937), Howe (1966), Black (1968), Wood (1980) and Heaton (1996).
Ischyromys pliacus was named by Troxell (1922). Its type locality is Cherry Creek, which is in an Orellan terrestrial horizon in Wyoming.

It was synonymized subjectively with Ischyromys typus by Galbreath (1953), Black (1968), Heaton (1993) and Heaton (1996).
Ischyromys troxelli was named by Wood (1937). Its type locality is Sheep Mountain (Middle Oreodon), which is in an Orellan terrestrial horizon in the Brule Formation of South Dakota.

It was synonymized subjectively with Ischyromys typus by Black (1968), Heaton (1993) and Heaton (1996).

Synonymy list

Year	Name and author
1856	Ischyromys typus Leidy p. 89
1857	Ischyromys typus Leidy p. 89
1873	Gymnoptychus chrysodon Cope
1873	Ischyromys chrysodon Cope
1873	Colotaxis cristatus Cope p. 1
1873	Gymnoptychus chrysodon Cope p. 5
1902	Ischyromys typus Hay p. 725
1908	Ischyromys typus Lambe
1910	Ischyromys cristatus Matthew
1922	Ischyromys pliacus Troxell
1922	Ischyromys typus lloydi Troxell
1937	Ischyromys troxelli Wood
1980	Ischyromys pliacus Wood
1980	Ischyromys troxelli Wood
2014	Ischyromys typus Korth

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

Rank	Name	Author
—	Mammaliaformes
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Euarchontoglires	Murphy et al. 2001
—	Gliriformes	Wyss and Meng 1996
—	Glires	()
—	Simplicidentata	()
order	Rodentia	Bowdich 1821
family	Ischyromyidae	Alston 1876
genus	Ischyromys
species	typus

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.

†Ischyromys typus Leidy 1856

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Invalid names: Colotaxis cristatus Cope 1873 [synonym], Gymnoptychus chrysodon Cope 1873 [synonym], Ischyromys pliacus Troxell 1922 [synonym], Ischyromys troxelli Wood 1937 [synonym]

†Ischyromys typus lloydi Troxell 1922

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Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingo

Diet:

herbivoreo

Reproduction:

viviparoussubc

Created:

2005-08-26 14:04:46

Modified:

2005-08-26 16:04:46

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

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

Age range: base of the Chadronian to the top of the Whitneyan or 37.20000 to 30.80000 Ma

Collections (47 total)

Time interval	Ma	Country or state	Original ID and collection number
Chadronian	37.2 - 33.9	USA (Nebraska)	Ischyromys pliacus (16929)
Chadronian	37.2 - 33.9	USA (Colorado)	Ischyromys troxelli (16977)
Chadronian	37.2 - 33.9	USA (Wyoming)	Ischyromys typus (16922 16986)
Chadronian	37.2 - 33.9	USA (Montana)	Ischyromys pliacus (16924 17028)
Late/Upper Chadronian	37.2 - 33.9	USA (Colorado)	Ischyromys typus (85117)
Orellan	33.9 - 33.3	USA (South Dakota)	Ischyromys pliacus (17115) Ischyromys sp. (17186 17187 17188 17189 17190) Ischyromys troxelli (17179) Ischyromys typus (17094 17102 17103 17133 17173 17174 17182 17295)
Orellan	33.9 - 33.3	USA (Colorado)	Ischyromys typus (17081 17082)
Orellan	33.9 - 33.3	USA (North Dakota)	Ischyromys typus (17100 17101)
Orellan	33.9 - 33.3	USA (Wyoming)	Ischyromys pliacus (17086)
Orellan	33.9 - 33.3	USA (Nebraska)	Ischyromys lloydi (17150) Ischyromys pliacus (17242 17244 17250) Ischyromys typus (17062 17108 17164 17165 17212 17216 17223 17249 17253 17257 17275 17287)
Whitneyan	33.3 - 30.8	USA (South Dakota)	Ischyromys pliacus (17336) Ischyromys typus (170168)
Whitneyan	33.3 - 30.8	USA (Nebraska)	Ischyromys sp. (17414) Ischyromys typus (17427)