PBDB Taxon

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Isectolophus annectens

Mammalia - Perissodactyla

Taxonomy

Isectolophus annectens was named by Scott and Osborn (1887). Its type specimen is Princeton Museum Catalogue No. 10400, a set of teeth (upper and lower teeth), and it is a 3D body fossil. Its type locality is Myton Pocket, which is in an Uintan terrestrial horizon in the Uinta Formation of Utah. It is the type species of Isectolophus.

Synonyms

Homogalax uintensis was named by Troxell (1922). Its type specimen is YPM 12561 and is a 3D body fossil. Its type locality is Mouth of White River, which is in an Uintan terrestrial horizon in the Uinta Formation of Utah.

It was synonymized subjectively with Schizolophodon cuspidens by Van Houten (1945); it was synonymized subjectively with Isectolophus annectens by Radinsky (1963) and Colbert and Schoch (1998).
Isectolophus scotti was named by Peterson (1919). Its type specimen is Natural Science Museum of Princeton University No. 10399, a partial skeleton (fragments of upper and lower jaws, vertebrae, limb- and foot-bones), and it is a 3D body fossil. Its type locality is White River (Uinta C), which is in an Uintan terrestrial horizon in the Uinta Formation of Utah.

It was synonymized subjectively with Isectolophus annectens by Radinsky (1963) and Colbert and Schoch (1998).
Schizolophodon cuspidens was named by Peterson (1919). Its type specimen is C. M. No. 3045, a mandible (right lower jaw and symphysis with roots of canines and the anterior cheek-teeth of the right ramus), and it is a 3D body fossil. Its type locality is Myton Pocket, which is in an Uintan terrestrial horizon in the Uinta Formation of Utah. It is the type species of Schizolophodon.

It was synonymized subjectively with Isectolophus annectens by Radinsky (1963) and Colbert and Schoch (1998).

Synonymy list

Year	Name and author
1887	Isectolophus annectens Scott and Osborn p. 260
1902	Isectolophus annectens Hay p. 627
1919	Isectolophus annectens Peterson p. 116
1919	Isectolophus scotti Peterson p. 120
1919	Schizolophodon cuspidens Peterson p. 122
1922	Homogalax uintensis Troxell
1963	Isectolophus annectens Radinsky p. 24
2004	Isectolophus annectens Holbrook et al. p. 952

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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	()

Rank	Name	Author
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
—	Tapiromorpha	(Haeckel 1873)
genus	Isectolophus
species	annectens

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.

†Isectolophus annectens Scott and Osborn 1887

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Invalid names: Homogalax uintensis Troxell 1922 [synonym], Isectolophus scotti Peterson 1919 [synonym], Schizolophodon cuspidens Peterson 1919 [synonym]

Diagnosis

Reference	Diagnosis
L. B. Radinsky 1963	Large isectolophids. Mean length MM = 46.8 mm. P with two lingual cusps. See Table 3.

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingsubo

Diet:

browsersubo

Reproduction:

viviparoussubc

Created:

2005-08-31 15:02:20

Modified:

2005-08-31 17:02:20

Source: subo = suborder, subc = subclass, c = class, subp = subphylum

References: Lillegraven 1979, Carroll 1988, Ji et al. 2002, Hendy et al. 2009, Colbert and Schoch 1998

Age range: Uintan or 46.20000 to 39.70000 Ma

Collections (7 total)

Time interval	Ma	Country or state	Original ID and collection number
Early/Lower Uintan	46.2 - 39.7	USA (Colorado)	Isectolophus annectens (16623)
Uintan	46.2 - 39.7	USA (Utah)	Homogalax uintensis (16606) Isectolophus annectens (16589 16654 222805) Isectolophus annectens, Isectolophus scotti (16657) Isectolophus annectens, Schizolophodon cuspidens (type locality: 16607)