Rena humilis

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Rena humilis
Rena humilis in hand.jpg
Western threadsnake
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Leptotyphlopidae
Genus: Rena
Species:
R. humilis
Binomial name
Rena humilis
Baird & Girard, 1853
Rena humilis range map.png
Synonyms

Rena humilis, known commonly as the western blind snake, the western slender blind snake, and the western threadsnake, [4] is a species of snake in the family Leptotyphlopidae. The species is native to the southwestern United States and northern Mexico. Six subspecies are recognized as being valid, including the nominate subspecies described here. [4]

Contents

Description

A closeup of L. humilis head Leptotyphlops humilis - head.jpg
A closeup of L. humilis head

R. humilis, like most species in the family Leptotyphlopidae, resembles a long earthworm. It lives underground in burrows, and since it has no use for vision, its eyes are mostly vestigial. The western blind snake is pink, purple, or silvery-brown in color, shiny, wormlike, cylindrical, blunt at both ends, and has light-detecting black eyespots. The skull is thick to permit burrowing, and it has a spine at the end of its tail that it uses for leverage. It is usually less than 30 cm (12 in) in total length (tail included), and is as thin as an earthworm. This species and other blind snakes are fluorescent under low frequency ultraviolet light (black light). [5]

On the top of the head, between the ocular scales, L. humilis has only one scale ( L. dulcis has three scales). [6]

Geographic range

R. humilis is found in the southwestern United States and northern Mexico. In the US it ranges from southwestern and Trans-Pecos Texas west through southern and central Arizona, southern Nevada, southwestern Utah, and southern California. In Mexico its distribution includes the Mexican states of Baja California, Sonora, Sinaloa, Nayarit, Jalisco, Colima, Chihuahua, Durango, Coahuila, Tamaulipas, and San Luis Potosí.

The type locality given is "Valliecitas, Cal." The type locality was restricted by Klauber (1931) to "vicinity of Vallecito, eastern San Diego County, California," and by Brattstrom (1953) to "the Upper Sonoran Life Zone of the Vallecito area". [2]

Habitat and diet

R. humilis lives underground, sometimes as deep as 20 metres (66 ft), and is known to invade ant and termite nests. Its diet is made up mostly of insects and their larvae and eggs. It is found in deserts and scrub where the soil is loose enough for burrowing.

Subspecies

Subspecies [4] Authority [4] Common name [4] Geographic range
R. h. cahuilae Klauber, 1931Desert blind snake
R. h. humilis(Baird & Girard, 1853)Southwestern blind snake
R. h. levitoni Murphy, 1975Santa Catalina Island blind snake
R. h. lindsayiMurphy, 1975Lindsay's blind snake
R. h. tenuiculus(Garman, 1884)
R. h. utahensis V. Tanner, 1938Utah blind snake

References

  1. Hammerson GA, Frost DR, Santos-Barrera G (2007). "Rena humilis ". The IUCN Red List of Threatened Species 2007: e.T64058A12740895. https://dx.doi.org/10.2305/IUCN.UK.2007.RLTS.T64058A12740895.en. Downloaded on 25 July 2018.
  2. 1 2 McDiarmid RW, Campbell JA, Touré TA (1999). Snake Species of the World: A Taxonomic and Geographic Reference, Volume 1. Washington, District of Columbia: Herpetologists' League. 511 pp. ISBN   1-893777-00-6 (series). ISBN   1-893777-01-4 (volume).
  3. Species Rena humilis at The Reptile Database www.reptile-database.org.
  4. 1 2 3 4 5 "Leptotyphlops humilis ". Integrated Taxonomic Information System . Retrieved 30 August 2007.
  5. Hulse AC (1971). "Fluoresence in Leptotyphlops humilis (Serpentes: Leptotyphlopidae)". The Southwestern Naturalist16 (1): 123–124. doi : 10.2307/3670106
  6. 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. (Leptotyphlops humilis, pp. 136–137).

Further reading