Mexican beaded lizard beaded lizard under the Convention on International Trade in Endangered Species as an Appendix I animal, making it illegal to export the species. Mexican beaded lizard The Mexican beaded lizard ("Heloderma horridum") is a species of lizard in the family Helodermatidae, one of the two species of venomous beaded lizards found principally in Mexico and southern Guatemala. It and its congener (member of the same genus) the Gila monster ("Heloderma suspectum") are the only lizards known to have evolved an overt venom delivery system. The Mexican beaded lizard is larger than the Gila monster, with duller coloration, black with yellowish
Southern alligator lizard the fact that the back and belly scales of these lizards are reinforced by bone, as they are in alligators. Three subspecies can be distinguished: the California alligator lizard ("E. m. multicarinata"), the San Diego alligator lizard ("E. m. webbii"), and the Oregon alligator lizard ("E. m. scincicauda"). The subspecific name "webbii" is in honor of Thomas Hopkins Webb (1801–1866) who was Secretary of the United States and Mexican Boundary Survey (1848–1855). The subspecific name "scincicauda" means "skink tail". The southern alligator lizard measures from 3 to 7 inches (7.3 - 17.8 cm) in snout-to-vent length (SVL). Including tail, it