PBDB Taxon

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

Xestops

Osteichthyes - Anguidae

Taxonomy

Xestops was named by Cope (1873). It is not extant. Its type is Oreosaurus vagans.

It was assigned to Diploglossinae by McDowell and Bogert (1954), Hecht (1959); to Melanosaurini by Estes (1983); to Glyptosaurinae by Meszoely (1970), Sullivan (1986); and to Anguidae by Hay (1902), Hay (1930), Gilmore (1938), Galbreath (1953), Carroll (1988).

Species

Oreosaurus gracilis, Oreosaurus lentus, Oreosaurus microdus, Oreosaurus minutus, Oreosaurus vagans (type species), X. savagei, X. vagans (syn. Dimetopisaurus wyomingensis)

Synonyms

Oreosaurus was named by Marsh (1872). Its type is Oreosaurus vagans.

It was replaced with Xestops by Hay (1902).
Dimetopisaurus was named by Hecht (1959). Its type is Dimetopisaurus wyomingensis.

It was synonymized subjectively with Xestops by Meszoely (1970).

It was assigned to Diploglossinae by Hecht (1959).

Synonymy list

Year	Name and author
1872	Oreosaurus Marsh p. 303
1873	Xestops Cope
1902	Xestops Hay p. 475
1930	Xestops Hay p. 255
1938	Xestops Gilmore p. 22
1953	Xestops Galbreath p. 39
1954	Xestops McDowell and Bogert p. 130
1959	Dimetopisaurus Hecht p. 132
1959	Xestops Hecht p. 132
1970	Xestops Meszoely p. 120
1983	Xestops Estes
1986	Xestops Sullivan p. 110
1988	Xestops Carroll

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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

Rank	Name	Author
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
—	Sauropsida
class	Reptilia
—	Squamata	()
—	Anguimorpha	(Fürbringer 1900)
—	Anguiformes	(Bonaparte 1831)
superfamily	Anguioidea	Fitzinger 1826
family	Anguidae	Gray 1825
subfamily	Glyptosaurinae	Marsh 1872
genus	Xestops	Cope 1873

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. †Xestops Cope 1873

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†Xestops savagei Smith and Gauthier 2013

†Xestops vagans Marsh 1872

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Invalid names: Dimetopisaurus wyomingensis Hecht 1959 [synonym]

Invalid names: Dimetopisaurus Hecht 1959 [synonym], Oreosaurus Marsh 1872 [replaced]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubf

Locomotion:

actively mobilec

Life habit:

ground dwellingsubf

Diet:

insectivoref

Diet 2:

carnivoref

Created:

2005-09-23 14:40:23

Modified:

2005-09-23 16:40:23

Source: subf = subfamily, f = family, c = class, subp = subphylum

References: Carroll 1988, Behler and King 1979, Hendy et al. 2009, Head 2005

Age range: base of the Clarkforkian to the top of the MN 4 or 57.50000 to 15.98000 Ma

Collections (29 total)

Time interval	Ma	Country or state	Original ID and collection number
Clarkforkian	57.5 - 56.0	USA (Wyoming)	X. sp. (15082) X. vagans (15132 15159)
Lostcabinian	56.0 - 51.1	USA (Wyoming)	X. sp. (15917)
Lysitean - Lostcabinian	56.0 - 51.1	USA (Wyoming)	X. savagei (15451)
Wasatchian	56.0 - 51.1	USA (North Dakota)	X. sp. (15895)
Wasatchian	56.0 - 51.1	USA (Wyoming)	X. savagei (181313) X. sp. (46644 226069) X. vagans (15665 15666 15667 27268)
Wasatchian - Bridgerian	56.0 - 45.9	USA (Wyoming)	X. vagans (15669)
Bridgerian	51.1 - 45.9	USA (Wyoming)	Oreosaurus vagans (16228) X. sp. (16432) X. sp., Dimetopisaurus wyomingensis (16244) X. vagans (15837 16261 16262 16266 16269 16270 16273 27269 70257)
Bridgerian	51.1 - 45.9	USA (Utah)	X. vagans (16396)
Middle Eocene	48.07 - 37.71	USA (Wyoming)	Oreosaurus lentus, Oreosaurus gracilis, Oreosaurus microdus, Oreosaurus minutus (81455)
MN 4	16.9 - 15.98	Czechia (Karlovy Vary)	X. sp. (138666)