Southern alligator lizard

The following five subspecies are recognized as being valid, including the nominotypical subspecies.[1]

• Elgaria multicarinata ignava (Van Denburgh, 1905)
• Elgaria multicarinata multicarinata (Blainville, 1835)
• Elgaria multicarinata nana (Fitch, 1934)
• Elgaria multicarinata scincicauda (Skilton, 1849)
• Elgaria multicarinata webbii (Baird, 1859)

Nota bene: A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than Elgaria.

The generic name Elgaria is possibly named for an "Elgar" or a pun on "alligator." The specific name multicarinata refers to the keeled scales characteristic of this species.[4] The common name "alligator lizard" is a reference to the fact that the back and belly scales of these lizards are reinforced by bone, as they are in alligators.[5]

The subspecific name webbii is in honor of Thomas Hopkins Webb (1801–1866) who was Secretary of the United States and Mexican Boundary Survey (1848–1855).[6] The subspecific name scincicauda means "skink tail".

Adult southern alligator lizard, San Joaquin County California

The southern alligator lizard measures from 3 to 7 inches (7.3 - 17.8 cm) in snout-to-vent length (SVL). Including tail, it can reach a foot in length (30 cm).[3]It has a round thick body with small legs and a long somewhat prehensile tail that can be twice as long as the lizard's body.[2] Like many lizards, this species can drop its tail if attacked, possibly giving it a chance to flee. It lives on average 10 to 15 years, and survives well in captivity.[2]

The color of this species is variable, and can be brown, gray, green, or yellowish above, often with red blotches on the middle of the back. Usually there are between 9 and 13 dark crossbands on the back, sides, and tail, with adjacent white spots. These crossbands can be pronounced or covered with reddish or yellowish color.[3][4]

The scales of E. multicarinata are keeled on the back, sides, and legs. There are 14 rows of scales across the back at the middle of the body. A band of smaller granular scales separates the larger scales on the back and stomach, creating a fold along each side of the animal. These folds allow the body to expand to hold food or eggs.[4]

The southern alligator lizard is native to the Pacific coast of North America, ranging from the state of Washington to Baja California. These lizards can be found across many diverse habitats, including grassland, open forest, chaparral, suburban and urban areas, and even into the desert along the Mojave River.[4][7] This species is particularly common in foothill oak woodlands, and is often found hiding under rocks, logs, or other surface cover.[4]

E. multicarinata eats small arthropods, slugs, lizards, small mammals, and occasionally young birds and eggs.[3]

Defensive display

The southern alligator lizard frequently can be found near human habitation, and is often seen foraging in the mornings and evenings. It is often found in or around suburban yards and garages.[4] E. multicarinata is notable for its vicious self-defense, and will bite and defecate if handled.[2]

Mating occurs in spring, typically from April to May, though in warmer regions this species will breed year-round.[4][5] Eggs are usually laid between May and June and hatch during late summer and early fall.[4] Females lay two clutches of eggs per year, often in decaying wood or plant matter to keep them warm. Females will guard the eggs until they hatch.[5]

• Northern alligator lizard

Wikimedia Commons has media related to Elgaria multicarinata.

• Western Ecological Research Center: "Elgaria multicarinatus ", the southern alligator lizard

• Behler, John L.; King, F. Wayne (1979). The Audubon Society Field Guide to North American Reptiles and Amphibians. New York: Alfred A. Knopf. 743 pp. ISBN 0-394-50824-6. (Gerrhonotus multicarinatus, pp. 542 + Plates 445, 449).
• Blainville, H.D. de (1835). "Description de quelques espèces de reptiles de la Californie précédée de l'analyse d'un système général d'herpétologie et amphibiologie ". Nouvelles Annales du Muséum D'Histoire Naturelle 4: 233-296. ("Cordylus (Gerrhonotus) multi-carinatus ", new species, p. 289 + Plate XXV, figures 2, 2A, 2B, 2C). (in French).
• Smith, Hobart M.; Brodie, Edmund D., Jr. (1982). Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. ISBN 0-307-13666-3 (paperback), 0-307-47009-1 (hardcover). (Elgaria multicarinata, pp. 88–89).