CaliforniaHerps.com

A Guide to the Amphibians
and Reptiles of California


Sierra Night Lizard - Xantusia sierrae

Bezy, 1967

(= Xantusia vigilis sierrae)
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Night Lizards Range MapRange in California: Green

Red: Desert Night Lizard


observation link





Sierra Night Lizard
Adult with regenerating tail, Kern County
Sierra Night Lizard Sierra Night Lizard Sierra Night Lizard
Adult with regenerating tail, Kern County Adult, Kern County © Tim Burkhardt
Sierra Night Lizard Sierra Night Lizard Night lizard scales
Adult, Kern County © Jackson Shedd The Night Lizards, genus Xantusia, have small granular scales on soft skin.
Xantusia henshawi is shown here.
     
Habitat
Sierra Night Lizard Habitat Sierra Night Lizard Habitat Sierra Night Lizard Habitat
Habitat, Kern County
© Tim Burkhardt
Habitat, Kern County Habitat, Kern County
  Sierra Night Lizard Habitat  
  Habitat, Kern County  
   
Description
 
Size
1.5 - 2.75 inches long from snout to vent (3.8 - 7 cm). (Stebbins 2003)

Appearance
A small thin lizard with soft skin with fine granular scales on most of the body, a head covered with large plates, lidless eyes with vertical pupils, a gular fold, and a detachable tail.
The head and body tend to be flattened, an adaptation to this lizard's rock-crevice habitat.
Dorsal scales in 40 -44 lengthwise rows at mid-body.
Color and Pattern
Color is olive, grayish, or brown with light brown or black spots which tend to be interconnected, forming a dark net-like pattern.
A broad and conspicuous stripe extends from the eye to the shoulder.
The underside is whitish and made up of large square scales, usually in 12 rows.
Male / Female Differences
Males have enlarged femoral pores.

Life History and Behavior

Activity
Little is known about this lizard.
Presumably it is similar to other California Xantusiids, being diurnal (contrary to the common name) and crepuscular.
It is certainly secretive - spending most of its life undercover, and a specialized rock-crevice dweller, living under flakes of granite on rocky outcrops and in rock crevices.
It is not typically active on the surface away from cover.
Defense
The tail breaks off easily and continues wriggling to distract would-be predators long enough for the lizard to run away.
Diet and Feeding
Little is known about the diet of this lizard. Presumably it is similar to other related California Xantusiids, which eat small invertebrates such as ants, termites, beetles, caterpillars, crickets, and spiders.
Breeding
Little is known about this lizard's reproduction.
Related California Xantusiids breed in late spring and the young are born live, 1-3 per brood, from  August to October.

Habitat
Inhabits rocky outcrops around Granite Station in open grassland with scattered oak woodland and low shrubs.

Geographical Range
Endemic to California.
Found only in the southwestern foothills of the Sierra Nevada Mountains along the western edge of the Greenhorn mountains around Granite Station, in Kern Co.

Notes on Taxonomy
Described by Bezy in 1967.

Several subspecies of Xantusia vigilis are traditionally recognized, including two in California -
X. v. vigilis
X. v. sierrae


Using nuclear DNA studies, Leavitt et al, 2007, provide support for the recognition of new species within the X. vigilis complex, including X. wigginsi in California, but they continue to recognize the subspecies X. v. vigilis and X. v.sierrae. In addition, they identify several major clades, four of which occur in California - X. vigilis, X. wigginsi (now a full species), a Yucca Valley clade, and a San Jacinto clade.

The 2008 Society for the Study of Amphibians and Reptiles Standard Names List uses X. sierrae based on Sinclair et. al (2004, Am. Nat. 164:396-141).


Alternate and Previous Names (Synonyms)

Xantusia vigilis sierrae - Sierra Night Lizard (Stebbins 1985, 2003)

Conservation Issues  (Conservation Status)
Due to its small range, the Sierra Night Lizard is very suceptible to any habitat alteration. This lizard needs exfoliated and fissured granite outcrops to survive. It takes thousands of years for this exfoliation and fissuring to occur, so this habitat will not be replaced for many centuries. When flakes and slabs are torn off rock outcrops by someone searching for this lizard or other reptiles, the habitat is irreparably damaged. Such rock destruction is illegal in California: "It is unlawful to use any method or means of collecting that involves breaking apart of rocks, granite flakes, logs or other shelters in or under which reptiles may be found." (2007 regulations 5.60.4.) However, this does not protect the lizard from other sources of rock destruction including human development of its habitat.
Taxonomy
Family Xantusiidae Night Lizards Baird, 1858
Genus Xantusia Night Lizards Baird, 1859 “1858”
Species

sierrae Sierra Night Lizard Bezy, 1967
Original Description
Xantusia vigilis - Baird, 1858 - Proc. Acad. Nat. Sci. Philadelphia, Vol. 10, p. 255
Xantusia vigilis sierrae - Bezy, 1967 - Journ. Arizona Acad. Sci., Vol. 4, p. 163

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

Meaning of the Scientific Name
Xantusia - honors Xantus, John
sierrae - of the Sierra Nevada Mountains - type locality, Kern County, CA

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

Related or Similar California Lizards
X. henshawi - Granite Night Lizard
X. gracilis - Sandstone Night Lizard
X. vigilis - Desert Night Lizard
X. r. reticulata - San Clemente Night Lizard

More Information and References
California Department of Fish and Wildlife

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 are copied from the 2017 Special Animals List and the 2017 Endangered and Threatened Animals List which are published by the California Department of Fish and Wildlife.

If no status is listed here, the animal is not included on either CDFW list. This most likely indicates that there are no serious conservation concerns for the animal. To find out more about an animal's status, you can go to the NatureServe and IUCN websites to check their rankings.

Check here to see the most current complete lists.



Formerly listed as the subspecies Xantusia vigilis sierrae - Sierra Night Lizard, his lizard is now listed as the full species Xantusia sierrae - Sierra Night Lizard.

Organization
Status Listing
NatureServe Global Ranking G5T1 Secure—Common; widespread and abundant.

[This ranking apparently refers to the full species that this taxa formerly belonged to, Xantusia vigilis, and indicates that the status of the species is secure, not the subspecies.]
NatureServe State Ranking S1

Critically imperiled in the state because of extreme rarity (often 5 or fewer populations) orbecause of factor(s) such as very steep declines making it especially vulnerable to extirpation from the state.

U.S. Endangered Species Act (ESA) None
California Endangered Species Act (CESA) None
California Department of Fish and Wildlife SSC Species of Special Concern
Bureau of Land Management None
USDA Forest Service S Sensitive
IUCN Not listed


 

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