Gila monster
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The Gila monster is a species of venomous lizard native to the Southwestern United States and the northwestern Mexican state of Sonora. It is a heavy, slow-moving reptile, up to 22 in long, and it is
Gila monster 2
Evolutionary splitting of the genus Heloderma into species (Reiserer et al) Explanation of the numbers 1 Late Eocene (about 35 million years) 2 Late Miocene (about 10 million years) 3 Pliocene (about 4.4 million years) 4 Pliocene (about 3.0 million years)
The first drawing of a Gila monster by Baird, S. F. (1857)
A plate from the Century Cyclopedia that depicts the Gila monster
Mexican beaded lizard
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The Mexican beaded lizard or beaded lizard is a species of venomous lizard in the family Helodermatidae, one of the two species of venomous beaded lizards found principally in Mexico and southern Guat
Gila monster
…membrane. The Gila monster has four close living relatives, all of which are beaded lizards. There are three species in Mexico: Heloderma exasperatum, H. horridum and H. alvarezi, as well as another species in Guatemala: H. charlesbogerti. The evolutionary history of the Helodermatidae may be traced back to the…
Heloderma horridum Zurich Zoo 8a
Close-up of a helodermatid's skin, composed of beadlike scales
Beaded lizard skeleton (Museum of Osteology)
A pair of Mexican beaded lizards at the Buffalo Zoo: The specimen on the right is in the process of shedding.