CaliforniaHerps.com

A Guide to the Amphibians
and Reptiles of California


Nevada Side-blotched Lizard - Uta stansburiana nevadensis

Ruthven, 1913
Click on a picture for a larger view




Side-blotched Lizards California Range Map
Range in California: Blue

Dot-localities Map


observation link





Nevada Side-blotched Lizard Nevada Side-blotched Lizard Nevada Side-blotched Lizard
Adult, Inyo County Adult male, Inyo County Adult, Inyo County
Nevada Side-blotched Lizard Nevada Side-blotched Lizard Nevada Side-blotched Lizard
  Adult male, Inyo County  
Nevada Side-blotched Lizard Nevada Side-blotched Lizard Nevada Side-blotched Lizard
  Adult male, Inyo County  
Nevada Side-blotched Lizard Nevada Side-blotched Lizard Nevada Side-blotched Lizard
  Adult male, Inyo County  
Nevada Side-blotched Lizard Nevada Side-blotched Lizard Nevada Side-blotched Lizard
Adult male, Inyo County Adult male, Inyo County
Nevada Side-blotched Lizard Nevada Side-blotched Lizard Nevada Side-blotched Lizard
Adult male, Inyo County Adult male, Inyo County
Nevada Side-blotched Lizard Nevada Side-blotched Lizard Nevada Side-blotched Lizard
Adult male, Inyo County Adult male, Inyo County
Nevada Side-blotched Lizard Great Basin Collared Lizard  
The "Side-blotch,"
a dark mark on each side
that gives this species its name.
The Side-blotched Lizards, genus Uta, have small keeled spineless scales on the back.  
     
Nevada Side-blotched Lizards From Outside California
Breeding adult male,
Grant County, Washington
Adult male with breeding season orange coloring (late May),
Grant County, Washington
Juvenile, Grant County, Washington Breeding adult male,
Grant County, Washington
Adult, Grant County, Washington
     
Habitat
Nevada Side-blotched Lizard Habitat Nevada Side-blotched Lizard Habitat Nevada Side-blotched Lizard Habitat
Habitat, Modoc County sagebrush desert Habitat, Inyo County high desert Habitat, sagebrush desert, Inyo County
     
Short Video
  Nevada Side-blotched Lizard  
  Nevada Side-blotched Lizards from the sagebrush desert of northern
Inyo County.
 
   
Description
 
Size
1.5 - 2.5 inches long from snout to vent (3.8 - 6.3 cm). (Stebbins 2003)

Appearance
A small brownish gray lizard with small smooth granular scales on the back, larger scales on the head and limbs, a gular fold, and a long thin tail.
Color and Pattern
Color is brown, gray, yellowish, or black, with dark blotches, spots, and sometimes stripes.
Often there is a double row of dark spots or wedges on the back, edged with white on the rear.
The underside is whitish to gray and mostly unmarked.
The throat is mottled with dark and light.
A dark blue-black mark on the sides of the chest behind the front limbs gives this lizard its name.
This mark is sometimes faint or absent.

This subspecies is characterized by consisting of mostly scattered light and dark spotting.
Male / Female Differences
Males are more colorful than females, having blue speckles on the upper surfaces, which are most visible during the light phase.
Northern lizards sometimes develop orange on the throat and belly.
Males also have a swollen tail base and enlarged postanals, but no distinct blue coloring on the belly (which can be found on male lizards of many other species.)
The throat is marked with blue, orange, or yellow.

Females are blotched on top with brown and white, often with stripes, and have a less well-defined blotch on the sides.
They have no blue speckling, and no color on the throat.
Similar Subspecies
This subspecies is distinguished by a fairly uniform dorsal pattern of scattered dark and light spots, a more reduced pattern than U. s. elegans.
Three Color Morphs and Associated Behavior
Some fascinating discoveries have been made recently that show cooperative behavior with this species. Males have blue, orange, and yellow color morphs:

Orange-throated males - are dominant, aggressive and territorial and mate with many different females.
Yellow-throated males - do not defend territories. They mimic females and sneak past territorial orange-throated males to mate with their females.
Blue-throated males- guard their mates, chasing off the yellow males, but they are run off when confronted by orange males. Blue males also cooperate with neighboring blue males to protect their respective mates from the orange and yellow males, and their breeding is much more successful when they do so.
(Sinervo and Zamudio, 2001)
You can read more about Male Uta cooperation and throat colors here.

Life History and Behavior

Activity
Diurnal.
Active much of the year whenever the temperature is warm.
Inactive during winter and during cold weather.
The most abundant and commonly-seen lizard in the deserts and semi-arid areas.
Usually the first lizard species out in the morning due to its small size which allows it to warm up quickly.
It is active mostly on the ground, but is also a good climber.
Often seen basking on rocks, hopping from boulder to boulder, or running quickly along the ground.
The tail is often broken off when a lizard is captured, but it will grow back with time.
Longevity
This lizard is short-lived, living only about one year.
Territoriality
Males use a push-up display to display their territory.
Defense
Often this lizard can be approached closely, since it relies on crypsis as a defence against predation, but when frightened it runs quickly into a burrow, under a surface object, or under vegetation.
The tail is easily detached and when detached wriggles for several minutes which may distract a predator from the lizard long enough for it to escape.
Diet and Feeding
Primarily insectivorous - eats small invertebrates such as beetles, grasshoppers, ants, spiders, scorpions and ticks.
Plant matter is sometimes eaten either for its water or by accident.
Breeding
Mates mostly in the spring. 1 - 7 clutches of 1 - 8 eggs are laid from March to August. (Stebbins 2003)
Females can store sperm to fertilize eggs at a later time.
Juveniles hatch from June to September, and breed the following spring.

Geographical Range
In California, this species is found east of the Sierra Nevada Mountains and in the far northeastern corner of the state, corresponding the the Great Basin desert portions of the state.

Its range outside California continues into northwestern Nevada, southwestern Idaho, easter Oregon, and mid central Washington.

The species as a whole ranges west through most of California south of the Bay Area, east into west Texas, and south into Mexico, including all of Baja California.
Elevational Range
From below sea level to around 9,000 ft. (2,700 m). (Stebbins 2003)

Habitat
Prefers open rocky areas with scattered vegetation, including the edges of sandy washes. Utilizes a wide variety of habitats, including hardpan, sandy, rocky, and loamy areas grown with sagebrush, scattered trees, grass, and shrubs.

Notes on Taxonomy
The taxonomy of this widespread and variable species has been disputed. Some experts do not recognize any subspecies of Uta stansburiana pending further studies that will provide more clarification about this species (which may include several different species). 

Three subspecies of Uta stansburiana are sometimes shown occuring in California, including U. s. stansburiana -
Northern Side-blotched Lizard, which is shown to range east of the Sierra Nevada Mountains in Inyo and Mono counties.

Conservation Issues  (Conservation Status)
None
Taxonomy
Family Phrynosomatidae Zebra-tailed, Earless, Fringe-toed, Spiny, Tree, Side-blotched, and Horned Lizards Fitzinger, 1843
Genus Uta Side-blotched Lizards Baird and Girard, 1852
Species stansburiana Common side-blotched lizard Baird and Girard, 1852
Subspecies

nevadensis Nevada side-blotched Lizard Ruthven, 1913
Original Description
Uta stansburiana - Baird and Girard, 1852 - Proc. Acad. Nat. Sci. Philadelphia, Vol. 6, p. 69
Uta stansburiana nevadensis - Ruthven, 1915 - Proc. Biol. Soc. Washington, Vol. 26, p. 27, fig. 1

from Original Description Citations for the Reptiles and Amphibians of North America © Ellin Beltz

Meaning of the Scientific Name
Uta - state of Utah - refers to the region where it was first discovered.
stansburiana
- honors Stansbury, Howard S.
nevadensis - belonging to the state of Nevada - probably refers to the type locality.

from Scientific and Common Names of the Reptiles and Amphibians of North America - Explained © Ellin Beltz

Alternate Names
Uta stansburiana - Common Side-blotched Lizard (no subspecies recognized.)

Related or Similar California Lizards
U. s. elegans - Western Side-blotched Lizard

More Information and References
NatureServe Explorer

USGS

Male Uta cooperation and throat colors

Stebbins, Robert C., and McGinnis, Samuel M.  Field Guide to Amphibians and Reptiles of California: Revised Edition (California Natural History Guides) University of California Press, 2012.

Stebbins, Robert C. California Amphibians and Reptiles. The University of California Press, 1972.

Stebbins, Robert C. A Field Guide to Western Reptiles and Amphibians. 3rd Edition. Houghton Mifflin Company, 2003.

Behler, John L., and F. Wayne King. The Audubon Society Field Guide to North American Reptiles and Amphibians. Alfred A. Knopf, 1992.

Powell, Robert., Joseph T. Collins, and Errol D. Hooper Jr. A Key to Amphibians and Reptiles of the Continental United States and Canada. The University Press of Kansas, 1998.

Bartlett, R. D. & Patricia P. Bartlett. Guide and Reference to the Turtles and Lizards of Western North America (North of Mexico) and Hawaii. University Press of Florida, 2009.

Jones, Lawrence, Rob Lovich, editors. Lizards of the American Southwest: A Photographic Field Guide. Rio Nuevo Publishers, 2009.

Smith, Hobart M. Handbook of Lizards, Lizards of the United States and of Canada. Cornell University Press, 1946.

Conservation Status

The following status listings come from the Special Animals List and the Endangered and Threatened Animals List which are published by the California Department of Fish and Wildlife.


There are no significant conservation concerns for this animal in California.

Organization
Status Listing
U.S. Endangered Species Act (ESA) None
California Endangered Species Act (CESA) None
California Department of Fish and Wildlife None
Bureau of Land Management None
USDA Forest Service None


 

Home Site Map About Us Identification Lists Maps Photos More Lists CA Snakes CA Lizards CA Turtles CA Salamanders CA Frogs
Contact Us Usage Resources Rattlesnakes Sounds Videos FieldHerping Yard Herps Behavior Herp Fun CA Regulations
Beyond CA All Herps


Return to the Top

 © 2000 -