Anniella geronimensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Reptilia Squamata Anniellidae

Scientific Name: Anniella geronimensis Shaw, 1940
Taxonomic Notes: Molecular data support recognition of the family Anniellidae as a monophyletic group (Macey et al. 1999).

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Hollingsworth, B. & Frost, D.R.
Reviewer(s): Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)
Listed as Endangered because its extent of occurrence is less than 5,000 km², its distribution is severely fragmented, and there is continuing decline in the extent and quality of its habitat.

Geographic Range [top]

Range Description:This species is endemic to the Pacific side of the State of Baja California, Mexico (Grismer 2002). It ranges from approximately 6 km north of Colonia Guerrero, southwards to just south of Punta Baja at the northern edge of Bahia El Rosario (a narrow strip about 87 km long). It ranges only 4 km inland in the Arroyo Socorro where the inshore breezes have carried the sand inland, but otherwise it is restrcited to the coastal margins. It also occurs on Isla San Gerónimo.
Countries occurrence:
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:It is a secretive animal that is not often encountered, but is thought to be common in its habitat (Grismer 2002).
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:This is a burrowing species which is restricted to areas of fine-grained sand substrates in dunes the coastal region. It is commonly found at the base of brittlebush (Encelia sp.), bursag (Ambrosia sp.) and locoweed (Astragulus sp.) which grow on the dunes.

Threats [top]

Major Threat(s): Its sand dune habitat is highly threatened by general coastal development for touristic resorts, urbanization, road building, expansion of intensive agriculture, and the impacts of off-road vehicles.

Conservation Actions [top]

Conservation Actions: There are no conservation measures in place; the species is not known from any protected areas. Populations of this species should be monitored to record changes in abundance and distribution. Protected areas are urgently needed where the species can survive, away from the threats of expanding human activities and off-road vehicles.

Citation: Hollingsworth, B. & Frost, D.R. 2007. Anniella geronimensis. The IUCN Red List of Threatened Species 2007: e.T63722A12710339. . Downloaded on 24 May 2018.
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