Mexican beaded lizard generic name "Heloderma" means "studded skin", from the Ancient Greek words "hêlos" (ἧλος)—the head of a nail or stud—and "dérma" (δέρμα), meaning skin. Its specific name, "horrĭdum", is the Latin word meaning rough or rude. The four subspecies of beaded lizard, elevated to full species in 2013, are: Adult beaded lizards range from in length. They are substantially larger than the Gila monster, which only reaches lengths of . The snout-to-vent length of a beaded lizard averages . The average body mass of an adult beaded lizard is , about 45% heavier than the average mass of a gila monster,
Aran rock lizard Aran rock lizard The Aran rock lizard ("Iberolacerta aranica") is a species of lizard in the family Lacertidae. "I. aranica" is found in a small area of the central Pyrenees on the Spanish-French border. It lives only in Mauberme massif, including its foothills between the Val d'Aran in Spain and the Ariège in France. The natural habitats of "I. aranica" are temperate grassland, rocky areas, and pastureland. "I. aranica" is threatened by habitat loss. The Aran rock lizard is a medium-sized lizard. Males can reach a total length (including tail) of up to , females up to . The back