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,
Slender glass lizard Slender glass lizard The slender glass lizard ("Ophisaurus attenuatus") is a legless lizard in the family Anguidae. The species is endemic to the United States. Two subspecies are recognised. Slender glass lizards have yellow to brown bodies with six stripes, and they have two lateral grooves (one on each side). Unlike snakes, they have eyelids and ears. "O. attenuatus" can attain a total length (including tail) of up to 1 meter (about 40 inches). "O. attenuatus" is found in the United States, from as far north as Wisconsin, east to Virginia, south to Florida, and west to Texas, in grasslands