Biology:Long-nosed leopard lizard

Short description: Species of lizard

Long-nosed leopard lizard
Taken at Mojave Desert
Conservation status
Least Concern (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Suborder:	Iguania
Family:	Crotaphytidae
Genus:	Gambelia
Species:	G. wislizenii
Binomial name
Gambelia wislizenii Baird & Girard, 1852
Synonyms
Crotaphytus wislizenii Baird & Girard, 1852 Crotaphytus gambelii Baird & Girard, 1852 Crotaphytus fasciatus Hallowell, 1852 Leiosaurus hallowelli A.H.A. Duméril, 1856 Crotaphytus (Gambelia) wislizenii — Baird, 1859 Crotaphytus fasciatus Mocquard, 1899 (non Hallowell) Crotaphytus fasciolatus Mocquard, 1903 Gambelia wislizenii — H.M. Smith, 1946

The long-nosed leopard lizard (Gambelia wislizenii) is a species of relatively large North American lizard in the family Crotaphytidae. Gambelia wislizenii ranges in snout-to-vent length (SVL) from 8.3 to 14.6 cm (3 ¹⁄₄ to 5 ³⁄₄ in). It has a large head, a long nose, and a long round tail that can be longer than its body. It is closely related to the blunt-nosed leopard lizard (Gambelia sila), which closely resembles the long-nosed leopard lizard in body proportions, but has a conspicuously blunt snout. The species G. wislizenii, once considered part of the genus Crotaphytus, is under moderate pressure because of habitat destruction but is categorized as "least concern".

Etymology

The specific name or epithet, wislizenii, is in honor of the German-American surgeon and naturalist Frederick Adolph Wislizenus, who caught the first specimen near Santa Fe, New Mexico.

Description

Gambelia wislizenii has granular dorsal scales that can be white, cream, or gray with irregular brown or dark gray spots along its body and head. Sometimes they have dark bars across their back. The tail also has dark bars across it. Juveniles have more highly contrasted markings compared to adults, often with rusty coloring on the back or bright red spots, and yellow on the thighs and under the tail.

The male and female are different in appearance. The female is about 15 cm (5.8 in) snout-vent length, and the male is smaller, measuring about 12 cm (4.8 in) SVL. Both sexes are capable of marked color changes. In its dark phase the lizard's spots are nearly hidden and light crossbars become quite obvious on both the body and the tail. In the light phase the opposite is true with the dominant color consisting of gray, pinkish, brown or yellowish brown hues. During the mating season females develop reddish orange spots and bars on their sides and underneath the tail when gravid. Males develop pink or rusty wash on the throat, chest, and sometimes the body, during the breeding season.

Distribution and habitat

The long-nosed leopard lizard prefers to inhabit arid and semiarid plains growth, like bunch grass, alkali bush, sagebrush, creosote bush, and other scattered low plants. The ground can be hardpan, sand, or even gravel with rocks that may often be used as basking sites. G. wislizenii prefers flat areas with open space for running, avoiding densely vegetated areas. It is found from near sea level to around 6,000 feet (1,800 m). Its range includes the western part of the United States from Oregon to Idaho in the north, south to northern Mexico in Baja California, Sonora, Coahuila, and Zacatecas and Casa Grande, Arizona. In San Diego County, it occurs east of the Peninsula Ranges within the Lower Colorado Desert. It is found in desert flats and lower foothills with little vegetation.

Behaviors

The long-nosed leopard lizard is often seen on small rocks along the roadside, preferring direct sunlight when basking. It is diurnal and has the potential to be active all day when the weather is mild to warm. The daily activity cycle starts relatively early (05:30–08:30, variation depends on location), and after a period of basking, long-nosed leopard lizards begin active hunting and feeding. When in danger, it uses a defense mechanism known as "freeze" behavior, which means it runs underneath a bush, flattens its body against the ground and is motionless until the threat is gone. If the case is extreme enough, such as capture, it is capable of caudal autotomy, or tail separation. Its speed and agility are major contributors to its predatory success as well as its ability to evade predators. When running at rapid speeds it runs with forelimbs raised.

Feeding habits

The long-nosed leopard lizard preys on small lizards, in addition to insects and sometimes rodents, like all members of the family. This lizard also is cannibalistic, eating smaller leopard lizards when the opportunity arises. On occasion, it will eat the young leopard lizards as they hatch, but the adults are usually not active during the time period when most young hatch from their eggs. This allows the young time to grow and become more of a contender with the larger adults. Its long nose usually makes its jaw quicker and better for catching vertebrate prey. This species utilizes stalking and ambush techniques when hunting. As an ambush predator, it lies in wait in the shadows underneath a bush or small tree, where its spotted pattern blends, waiting for its prey to come within capture range. When prey is sufficiently close, it uses a rapid pouncing movement to capture the prey in its strong jaws. The long-nosed leopard lizard has been documented to jump up to two feet (60 cm) in any direction, including into the air, in order to catch prey.

"More than one leopard lizard has been found choked to death by the size of the prey it attempted to swallow."

Some predators of long-nosed leopard lizards include a number of birds, snakes, coyotes, badgers, and the kit fox.

Reproduction

Gravid female

The breeding season of G. wislizenii extends from May to June with a single clutch of 5–6 eggs being laid usually in June or July, which hatch in the late summer months of July or August. During mating no pair bond is formed between adults. A single clutch is usually laid per year but in the warmer climates towards the south, it is possible for a female to lay up to two clutches per year. Birthing and egg-laying occur in a burrow, although no nest structure is formed. Egg incubation is estimated to be between five and seven weeks. Young emerge in August, when adult activity is coming to an end. The timing of the juvenile emergence coinciding with the cessation of adult activity may aid in the prevention of cannibalism.

Conservation status

The blunt-nosed leopard lizard (Gambelia sila) is endangered. It is no longer present throughout most of its former range as the habitat has been significantly altered by farming, urban development, overgrazing, oil wells, mining, reservoirs, and off-road vehicle use. This habitat alteration continues. However, there are no specific conservation concerns for the long-nosed leopard lizard (Gambelia wislizenii ).

Further reading

• Baird SF, Girard CF (1852). "Characteristics of some New Reptiles in the Museum of the Smithsonian Institution". Proc. Acad. Nat. Sci. Philadelphia 6: 68-70. (Crotaphytus wislizenii, new species, p. 69).
• Behler JL, King FW (1979). The Audubon Society Field Guide to North American Reptiles and Amphibians. New York: Alfred A. Knopf. 743 pp., 657 color plates. ISBN:0-394-50824-6. (Gambelia wislizenii, pp. 508–509 + Plate 357).
• Conant R (1975). A Field Guide to Reptiles and Amphibians of Eastern and Central North America, Second Edition. Boston: Houghton Mifflin. xviii + 429 pp. + 48 plates. ISBN:0-395-19979-4 (hardcover), ISBN:0-395-19977-8 (paperback). (Crotaphytus wislizenii, pp. 93–94 + Plate 15 + Map 50).
• Conant R, Collins JT (1998). A Field Guide to Reptiles and Amphibians of Eastern and Central North America. Third Edition, Expanded. Peterson Field Guide Series. Boston and New York: Houghton Mifflin. xviii + 616 pp. ISBN:0-395-90452-8 (paperback).
• Dixon JR (2000). Amphibians and Reptiles of Texas, Second Edition. W.L. Moody, Jr., Natural History Series, Number 25. College Station, Texas: Texas A&M University Press. 432 pp. ISBN:0-890-96920-5 (paperback).
• Powell R, Conant R, Collins JT (2016). Peterson Field Guide to Reptiles and Amphibians of Eastern and Central North America, Fourth Edition. Boston and New York: Houghton Mifflin Harcourt. xiv + 494 pp., 47 plates, 207 figures. ISBN:978-0-544-12997-9. (Gambelia wislizenii, p. 278 + Plate 24).
• Smith HM, Brodie ED Jr (1982). Reptiles of North America: A Guide to Field Identification. New York: Golden Press. 240 pp. ISBN:0-307-13666-3 (paperback), ISBN:0-307-47009-1 (hardcover). (Gambelia wislizenii, 108-109).
• Stebbins RC (2003). A Field Guide to Western Reptiles and Amphibians, Third Edition. Peterson Field Guide Series ®. Boston and New York: Houghton Mifflin. xiii + 533 pp. ISBN:978-0-395-98272-3 (paperback). (Gambelia wislizenii, pp. 274–275 + Plate 26 + Map 84).
• Stejneger L, Barbour T (1917). A Check List of North American Amphibians and Reptiles. Cambridge, Massachusetts: Harvard University Press. 125 pp. (Crotaphytus wislizenii, p. 46).
• Zim HS, Smith HM (1956). Reptiles and Amphibians: A Guide to Familiar Species: A Golden Nature Guide. New York: Simon and Schuster. 160 pp. (Gambelia wislizenii, pp. 53, 155).

External links

• California Herps
• San Diego Natural History Museum
• USGS: Long-nosed Leopard Lizard
• Gambelia wislizenii

Wikidata ☰ Q2703595 entry