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,
Leaf-nosed lizard Leaf-nosed lizard Ceratophora tennentii, commonly known as the horned lizard, horn-nosed lizard, leaf-nosed lizard, and Tennent's leaf-nosed lizard, is a species of lizard in the family Agamidae. The species is endemic to Sri Lanka. The generic name, "Ceratophora", means horn bearer. The specific name, "tennentii", is in honour of Irish politician James Emerson Tennent, who was Colonial Secretary of Ceylon (1845–1850). "C. tennentii" has a leaf-like appendage on the end of its nose. The species can reach lengths of over including the tail. Males usually have more green in their coloration than females have, although they can change color to