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Family: Crotaphytidae Order: Squamata Class: Reptilia
DISTRIBUTION, ABUNDANCE, AND SEASONALITY
The Great Basin collared lizard is widely distributed throughout the arid and semiarid
regions of the Mojave, Sonoran, and Southeastern Great Basin deserts. It is generally
restricted to areas with rocky substrates, slopes, gullies, washes, canyons, and sometimes
rock piles, although occasionally can be found up to a mile from extensive rocky habitat
(McGuire 1996). It is most common in desert succulent shrub, desert scrub, and desert wash
habitats. The Great Basin collared lizard is active in the spring and summer and to a lesser
extent in the early fall. Southern populations are active earlier than northern populations,
and remain active later in the year. It probably exhibits considerable variation in habits over
its range (Johnson et al. 1948, Stebbins 1985, Fitch 1956, Legler and Fitch 1957, Yedlin and
Ferguson 1973, Sanborn and Loomis 1979).
Andre, J. B. and J. A. MacMahon. 1980. Reproduction in three sympatric lizard species from west-central Utah. Great Basin Naturalist 40:68-72.
Brooking, W. J. 1934. Some reptiles and amphibians from Malheur County, inn eastern Oregon. Copeia 1934:93-95.
Fitch, H. S. 1956. An ecological study of the collared lizard (Crotaphytus collaris). Univ. Kans. Publ. Mus. Nat. Hist. 8:213-274.
Johnson, D. H., M. D. Bryant, and A. H. Miller. 1948. Vertebrate animals of the Providence Mountains area of California. Univ. Calif. Publ. Zool. 48:221-376.
Legler, J. and H. S. Fitch. 1957. Observations on hibernation and nests of the collared lizard, Crotaphytus collaris. Copeia 1957:305.
McGuire, J. A. 1996. Phylogenetic systematics of crotaphytid lizards (Reptilia: Iguania: Crotaphytidae). Bulletin of Carnegie Museum of Natural History 32:1-120.
Sanborn, S. R. and R. B. Loomis. 1979. Systematics and behavior of collared lizards (Crotaphytus collaris) in southern California. Herpetologica 35:101-106.
Stebbins, R. C. 1985. A field guide to western reptiles and amphibians. 2nd ed., revised. Houghton Mifflin, Boston. 336pp.
Yedlin, I. and G. Ferguson. 1973. Variations in aggressiveness of free-living male and female collared lizards, Crotaphytus collaris. Herpetologica 29:268-275.
California Department of Fish and Game. California Interagency Wildlife Task Group. 2005. California Wildlife Habitat Relationships version 8.1 personal computer program. Sacramento, California.
A Field Guide to the Reptiles and Amphibians of Coastal Southern California by Robert N. Fisher and Ted J. Case
Mojave Collared Lizard
Size: 2.75-4.57 in (6.9-11.6 cm)
Distinguishing characters: A large-bodied species with a broad head, short snout, granular scales, and two distinct black collar markings; collar markings separated at dorsal midline by no more than 12 pale scales; tan to olive colored; light lines and spots and yellowish to orangish crossbands on body.
Juveniles: Similar to adults, more distinct banding.
Dimorphism: Male has enlarged postanal scales, blue-grey throat and large dark blotches on flanks.
Similar species: Crotaphytus vestigium: Black collars separated by more than 12 light scales. Gambelia copei, Gambelia wislizenii: Lack black collars.
Very uncommon. Powerful runner; bipedal. Adults can inflict painful bite. Prefers rocky areas, particularly washes.