Sceloporus becki

Sceloporus becki
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Suborder:	Iguania
Family:	Phrynosomatidae
Genus:	Sceloporus
Species:	S. becki
Binomial name
	Sceloporus becki; Van Denburgh, 1905
Synonyms
	Sceloporus occidentalis becki Crowther, 2000

Sceloporus becki, also known as the island fence lizard,^[1] is a species of lizard endemic to the Channel Islands of California.^[2] ^[3]

Taxonomy

It was once considered a subspecies of the western fence lizard (Sceloporus occidentalis), but is now considered to be its own species. Many authorities have accepted research concluding that the island fence lizard (Sceloporus occidentalis becki) is its own unique species. However, there is some discrepancy between the current classification of the species and emerging findings, thus the taxonomy of the entire Sceloporus occidentalis species could be revised in the future.

Description

Despite it being a distinct subspecies, it shares a physically similar appearance as various mainland sub-species of the western fence lizard, a very common lizard in California.

The island fence lizard is a relatively small species characterized by keeled and pointed dorsal scales of uniform size across the back, sides, and belly. The scales on the thighs are mostly keeled and noticeably smaller, while the rear of the limbs is colored yellow or orange. A distinctive blue coloration is present on the sides of the belly. The lizard's overall coloration varies between brown, gray, or black with blotches, and it may have light markings forming stripes or irregular lines along the sides of the back. In some cases, dark blotching creates irregular bands. The belly is pale in color. Males are distinguished by blue markings on the sides of the belly, bordered in black, a black patch on the throat, enlarged postanal scales, and a swollen tail base. When exposed to light, some of the dorsal scales may exhibit a blue or greenish tint. In contrast, females show faint or absent blue belly markings, no blue or green coloration on their upper surfaces, and display dark bars or crescents on their backs. Juveniles typically lack blue throat markings and may have faint or no blue coloration on the belly. Due to the distinct vivid blue coloration on the abdomen of adult males of the species, this species is sometimes referred to as the “blue belly lizard”.

Behavior

These lizards are most active when temperatures are warm, and are often inactive during extreme thermal conditions. However, the moderate and consistent temperatures of the channel islands usually allow for year long activity. They are often seen in sunny areas, such as stream banks, beach driftwood, grassy hillsides, and human settlements. They are frequently seen basking on rocks, logs, fences, and walls.

Males typically establish territory on elevated perches in order to observe potential mates or rivals. Males defend their territory through physical combat, and try to attract females through displays of head-bobbing and pushups to show off blue throat and ventral colors.

Island fence lizards portray common behaviors of tail detachment and regeneration, being able to easily detach their tail to flee from predators. The detach tail squirms to distract a predator, allowing time for the lizard’s body to escape.

Reproduction

Adult island fence lizards mate in spring of their second year. Females lay between one and three clutches of eggs, with each clutch containing three to seventeen eggs, from April through July. The eggs take roughly 60 days to hatch, occurring between July and September. Eggs have a white leathery shell and typically measure 8 by 14 mm. Females lay there eggs in small pits of loose damp soil (usually during the night).

Etymology

The specific epithet, becki, is in honor of Rollo Howard Beck, an American ornithologist who collected the first specimens.^[4]^[5]

References

^ Sceloporus becki at the Reptarium.cz Reptile Database. Accessed 10 November 2021.
^ Hogan, 2008.
^ Flaxington, 2005.
^ Beltz, Ellin (2006). Scientific and Common Names of the Reptiles and Amphibians of North America - Explained. http://ebeltz.net/herps/biogappx.html
^ Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Sceloporus occidentalis becki, p. 21).

Flaxington, William (2005). Photograph of Island fence lizard on Santa Cruz Island. Calphotos [1]

External links

National Park Service, Channel Islands - Island Fence Lizard U.S. Department of the Interior
Island Fence Lizard - Sceloporus occidentalis becki CaliforniaHerps.com A Guide to the Amphibians and Reptiles of California
Island Fence Lizard - (Sceloporus occidentalis becki) Herpedia™.com A Guide to the Reptiles & Amphibians of the United States

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[RDB-1] Sceloporus becki at the Reptarium.cz Reptile Database. Accessed 10 November 2021.

[2] Hogan, 2008.

[3] Flaxington, 2005.

[4] Beltz, Ellin (2006). Scientific and Common Names of the Reptiles and Amphibians of North America - Explained. http://ebeltz.net/herps/biogappx.html

[5] Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN 978-1-4214-0135-5. (Sceloporus occidentalis becki, p. 21).

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