Heloderma exasperatum

The Rio Fuerte beaded lizard (Heloderma exasperatum) is a venomous species of beaded lizard in the family Helodermatidae. It is found in the tropical forests and shrublands of western Mexico, specifically around the Rio Fuerte and Rio Mayo basins. It is often found in or near abandoned mammal burrows and sources of water.^[4][5]

Rio Fuerte beaded lizard[1]
At Palais de la Découverte, France
Conservation status
CITES Appendix II (CITES)
Least Concern  (IUCN 3.1)[2]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Order:	Squamata
Family:	Helodermatidae
Genus:	Heloderma
Species:	H. exasperatum
Binomial name
Heloderma exasperatum Bogert & Martín del Campo, 1956
Synonyms[3]
Heloderma horridum exasperatum Bogert & Martín del Campo, 1956 Heloderma exasperatum — Reiserer et al., 2013

Geographic range

H. exasperatum is found in southwestern Chihuahua and southern Sonora, Mexico,^[3] up to an altitude of 1,400 m (4,600 ft).^[2]

Description

As an adult, the Rio Fuerte beaded lizard ranges from 60 to 90 cm (23.6 to 35.4 in) in total length (including tail). It can weigh up to 4 kg (8.8 lb). It is very similar to the Mexican beaded lizard in appearance and size.^[5]

Diet

H. exasperatum feeds mainly on reptile eggs, but also eats bird eggs, and nestlings of birds and mammals.^[2]

Reproduction

H. exasperatum is oviparous.^[3]

Taxonomy

The Rio Fuerte beaded lizard is a member of the family Helodermatidae. The species was formerly considered a subspecies of the Mexican beaded lizard, which is its closest living relative, but was elevated to full species status in 2013.^[6]

Etymology

The generic name, Heloderma, means "studded skin", from the Ancient Greek words hêlos (ηλος), meaning "the head of a nail or stud", and derma (δερμα), meaning "skin".

The specific name, exasperatum, means "completely rough" in Latin.^[5]