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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Lepidosauromorpha
Superordo: Lepidosauria
Ordo: Squamata
Cladus: Unidentata Episquamata Toxicofera
Subordo: Iguania
Infraordo: Pleurodonta

Familia: Phrynosomatidae
Genus: Urosaurus

Species: U. auriculatus - U. bicarinatus - U. clarionensis - U. gadovi - U. graciosus - U. irregularis - U. lahtelai - U. nigricaudus - U. ornatus

Urosaurus Hallowell, 1854

Urosaurus Hallowell, 1854 – Taxon details on Integrated Taxonomic Information System (ITIS).

Vernacular names

Urosaurus is a genus of lizards, commonly known as tree lizards or brush lizards, belonging to the New World family Phrynosomatidae.[1]


Species in the genus Urosaurus can be distinguished from members of the genus Sceloporus by the presence of a gular (under neck) fold and granular lateral scales. They can be distinguished from members of the genus Uta by the presence of enlarged (sometimes only slightly) dorsal scales.[citation needed]

Urosaurus have been used as a model system in lizard life-history studies, and populations produce two or more clutches of eggs per year.[2][3] Field studies have also shown a cost of reproduction in a natural New Mexico population of the species Urosaurus ornatus.[4]

In the genus Urosaurus there are nine species which are recognized as being valid.[5]

Urosaurus auriculatus (Cope, 1871)
Urosaurus bicarinatus (A.M.C. Duméril, 1856)
Urosaurus clarionensis (Townsend, 1890)
Urosaurus gadovi (Schmidt, 1921)
Urosaurus graciosus Hallowell, 1854
Urosaurus irregularis (Fischer, 1881)
Urosaurus lahtelai Rau & Loomis, 1977
Urosaurus nigricauda (Cope, 1864)
Urosaurus ornatus (Baird & Girard, 1852)


The specific name, gadovi, is in honor of German ornithologist Hans Friedrich Gadow.[6]

"Urosaurus Hallowell, 1854". Integrated Taxonomic Information System.
Michel L (1976). "Reproduction in a southwest New Mexican population of Urosaurus ornatus". The Southwestern Naturalist. 21 (3): 281–299. doi:10.2307/3669714. JSTOR 3669714.
Ballinger RE (1984). "Survivorship of the lizard, Urosaurus ornatus linearis, in New Mexico". Journal of Herpetology. 18 (4): 480–481. doi:10.2307/1564108. JSTOR 1564108.
Landwer AJ (1994). "Manipulation of egg production reveals costs of reproduction in the tree lizard (Urosaurus ornatus)". Oecologia. 100 (3): 243–249. Bibcode:1994Oecol.100..243L. doi:10.1007/BF00316951. PMID 28307007. S2CID 3226827.
Urosaurus at the Reptile Database. Accessed 28 January 2015.

Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Urosaurus gadovi, p. 96).

Further reading

Hallowell E (1854). "Descriptions of new Reptiles from California". Proc. Acad. Nat. Sci. Philadelphia 7: 91–97. (Urosaurus, new genus, p. 92).

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