''Urosaurus'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

lizard Lizard is the common name used for all Squamata, squamate reptiles other than snakes (and to a lesser extent amphisbaenians), encompassing over 7,000 species, ranging across all continents except Antarctica, as well as most Island#Oceanic isla ...

s, commonly known as tree lizards or brush lizards, belonging to the

New World The term "New World" is used to describe the majority of lands of Earth's Western Hemisphere, particularly the Americas, and sometimes Oceania."America." ''The Oxford Companion to the English Language'' (). McArthur, Tom, ed., 1992. New York: ...

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Phrynosomatidae The Phrynosomatidae are a diverse family of lizards, sometimes classified as a subfamily (Phrynosomatinae), found from Panama to the extreme south of Canada. Many members of the group are adapted to life in hot, sandy deserts, although the spiny ...

. They are native to North America, specifically the arid and semiarid regions of the western United States and Mexico, spending most of their time on trees, shrubs, or boulders.

Description

Species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

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 Uta or UTA may refer to: Universities *University of Texas at Arlington, in the United States *University of Texas at Austin, in the United States *University of Tarapacá, in Chile *University of Tampere, in Finland Sports * FC UTA Arad, a R ...

'' by the presence of enlarged (sometimes only slightly)

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage The fus ...

scales Scale or scales may refer to: Mathematics * Scale (descriptive set theory), an object defined on a set of points * Scale (ratio), the ratio of a linear dimension of a model to the corresponding dimension of the original * Scale factor, a number ...

. Some species of ''Urosaurus ( Urosaurus ornatus)'' appear to be polymorphic for throat color, but it does vary in different populations. In male lizards, these colors can range anywhere from orange, yellow, green, or turquoise, and in females the color can be either orange or yellow. Throat color in males is also appears to be associated with certain mating behaviors including aggression, boldness, submission, and cautiousness.

Reproduction

''Urosaurus'' have been used as a model system in lizard life-history studies, and populations produce two or more clutches of eggs per year. Field studies have also shown a cost of reproduction in a natural

New Mexico New Mexico is a state in the Southwestern United States, Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also ...

population of the species '' Urosaurus ornatus''.

Species

In the genus ''Urosaurus'' there are eight species which are recognized as being valid. ''

Nota bene ( ; plural: ) is the Latin language, Latin phrase meaning ''note well''. In manuscripts, ''nota bene'' is abbreviated in upper-case as NB and N.B., and in lower-case as n.b. and nb; the editorial usages of ''nota bene'' and ''notate bene'' fi ...

'': A binomial authority in parentheses indicates that the species was originally described in a genus other that ''Urosaurus''.

Description

Reproduction

Species

References

Further reading