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Masticophis anthonyi 

Scope: Global
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Chordata Reptilia Squamata Colubridae

Scientific Name: Masticophis anthonyi
Species Authority: (Stejneger 1905)

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii) ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Ponce-Campos, P. & García Aguayo, A.
Reviewer(s): Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)
Justification:
Listed as Critically Endangered as it is known from only one small island, which has an area much less than 100 km2, and its habitat is being degraded by introduced species on the island.

Geographic Range [top]

Range Description:This species is known only from Clarion island, in the Revillagigedo archipielago, off the coast of north western Mexico. The highest elevation on the island is 300 m asl (1,000 feet). The island is 6 by 4 miles (roughly 6 by 10 km) in size.
Countries occurrence:
Native:
Mexico
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:There is no information available on the population of this species.
Current Population Trend:Unknown
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:The species lives on the ground in open areas. The habitat on the island is predominantly grassland and shrubland. There is no freshwater available on the island.
Systems:Terrestrial

Threats [top]

Major Threat(s): This island is uninhabited by humans. However there have been recent introductions of species (pigs, rabbits, sheep) which are significantly degrading the habitat on the island (Mendez-Guardado, 2003). Grass and shrubland are being converted to desert where overgrazing is causing soil runoff.

Conservation Actions [top]

Conservation Actions: The area where the species occurs was declared a Biosphere Reserve in 1994 by the Goverment of Mexico. Eradication of the introduced species on the island is urgently needed to avoid further degradation of the habitat.

Citation: Ponce-Campos, P. & García Aguayo, A. 2007. Masticophis anthonyi. The IUCN Red List of Threatened Species 2007: e.T63844A12721436. . Downloaded on 25 May 2017.
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