Heloderma horridum


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Heloderma horridum
Species Authority: (Weigmann, 1829)
Common Name/s:
English Beaded Lizard
French Héloderme granuleux, Héloderme horrible
Spanish Escorpión, Lagarto de Cuentas
Trachyderma horridum Weigmann, 1829

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor/s: Canseco Marquez, L. & Muñoz, A.
Reviewer/s: Cox, N., Chanson, J.S. & Stuart, S.N. (Global Reptile Assessment Coordinating Team)
Listed as Least Concern in view of its wide distribution, presumed large population, it occurs in a number of protected areas, and because it is unlikely to be declining fast enough to qualify for listing in a more threatened category.
1996 Vulnerable
1994 Indeterminate (Groombridge 1994)
1990 Indeterminate (IUCN 1990)
1988 Indeterminate (IUCN Conservation Monitoring Centre 1988)
1986 Indeterminate (IUCN Conservation Monitoring Centre 1986)

Geographic Range [top]

Range Description: This species is found in at low to moderate elevations in the Pacific foothills of Mexico from southern Sonora to Chiapas, and along the Pacific drainages in southeastern Guatemala (Departamento de Santa Rosa). It has an elevational range of around 400 to 1,000 m asl.
Guatemala; Mexico
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: It appears to be an uncommon species.
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This lizard is most regularly encountered in tropical deciduous forest, but can also be found in thorn forest, tropical scrubland, and low elevation oak forest. It does not seem to be present in disturbed areas.
Systems: Terrestrial

Threats [top]

Major Threat(s): In general, the species is threatened by various forms of deforestation and by human persecution.

Conservation Actions [top]

Conservation Actions: This species is protected by Mexican law under the category A (Threatened), and it has been recorded from several protected areas. In Guatemala it is protected by national legislation, with part of the species range within protected areas. It is listed on Appendix II of CITES. Heloderma horridum charlesbogerti is listed on CITES Appendix I. Additional research is needed into the taxonomic status, distribution and threats to this species.
Citation: Canseco Marquez, L. & Muñoz, A. 2007. Heloderma horridum. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <>. Downloaded on 17 April 2014.
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