PBDB Taxon

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Isectolophus

Mammalia - Perissodactyla

Taxonomy

Isectolophus was named by Scott and Osborn (1887). Its type is Isectolophus annectens. It is the type genus of Isectolophinae.

It was assigned to Tapiridae by Hay (1902) and Scott (1913); to Isectolophinae by Peterson (1919); to Isectolophidae by Scott and Osborn (1887), Radinsky (1963), Carroll (1988), Prothero and Schoch (1989), Colbert and Schoch (1998), Holbrook (1999) and Holbrook et al. (2004); to Ancylopoda by Hooker and Dashzeveg (2004); and to Tapiromorpha by Colbert (2005).

Species

I. annectens (syn. Homogalax uintensis, I. scotti, Schizolophodon cuspidens) (type species), I. latidens (syn. Homogalax reliquius, Homogalax bridgerensis, I. bogdulensis), I. radinskyi

Synonyms

Parisectolophus was named by Peterson (1919). It is not extant.

It was synonymized subjectively with Isectolophus by Radinsky (1963), Schoch (1989), Prothero and Schoch (1989) and Colbert and Schoch (1998).

It was assigned to Isectolophinae by Peterson (1919).

Synonymy list

Year	Name and author
1887	Isectolophus Scott and Osborn
1902	Isectolophus Hay p. 627
1913	Isectolophus Scott p. 291
1919	Isectolophus Peterson p. 116
1919	Parisectolophus Peterson p. 121
1963	Isectolophus Radinsky p. 9
1976	Parisectolophus Gazin
1988	Isectolophus Carroll
1989	Isectolophus Prothero and Schoch p. 532
1998	Isectolophus Colbert and Schoch p. 573
1999	Isectolophus Holbrook p. 346
2004	Isectolophus Holbrook et al. p. 951
2004	Isectolophus Hooker and Dashzeveg p. 1375
2005	Isectolophus Colbert p. 6

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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
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
superorder	Perissodactylamorpha
order	Perissodactyla	()
—	Tapiromorpha	(Haeckel 1873)
genus	Isectolophus

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.

G. †Isectolophus Scott and Osborn 1887

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†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]

†Isectolophus latidens Osborn et al. 1878

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Invalid names: Homogalax bridgerensis Troxell 1922 [synonym], Homogalax reliquius Qi 1987 [synonym], Isectolophus bogdulensis Reshetov 1979 [synonym]

†Isectolophus radinskyi Schoch 1983

Invalid names: Parisectolophus Peterson 1919 [synonym]

Diagnosis

Reference	Diagnosis
L. B. Radinsky 1963	Medium-sized to large isectolophids. N o diastemata. P relatively small. P 313 with minute lingual crista. P submolariform, with one or two lingual cusps. M " relatively longer and narrower than in Homogalax, with protoconules and metaconules never disr tinct. Pa relatively low; P ^ with relatively low trigonid and high posterior medial ridge (= metalophid). No metastylid on m1-3.

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, Colbert and Schoch 1998, Hendy et al. 2009, Ji et al. 2002, Carroll 1988

Age range: base of the Bridgerian to the top of the Early/Lower Uintan or 50.30000 to 39.70000 Ma

Collections (16 total)

Time interval	Ma	Country or state	Original ID and collection number
Arshantan	56.0 - 37.71	Kazakhstan	I. latitdens (31009)
Early/Lower Eocene - Middle Eocene	55.8 - 37.71	Japan	I. sp. nov. (183077)
Bridgerian	50.3 - 46.2	USA (Nevada)	I. latidens (16218)
Bridgerian	50.3 - 46.2	USA (Wyoming)	I. latidens (16279 16647 202165) I. radinskyi (16277)
Early/Lower Uintan	46.2 - 39.7	USA (Colorado)	I. annectens (16623)
Late/Upper Uintan	46.2 - 39.7	USA (Utah)	I. sp. (109166)
Uintan	46.2 - 39.7	USA (Utah)	Homogalax uintensis (16606) I. annectens (16589 16654 222805) I. annectens, I. scotti (16657) I. annectens, Schizolophodon cuspidens (16607) I. sp. (222799)