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,
Pyrenean rock lizard Pyrenean rock lizard The Pyrenean rock lizard (Iberolacerta bonnali ) is a species of lizards in the family Lacertidae. It is endemic to the Pyrenees where it occurs at high altitudes and is only active in summer. The specific name, "bonnali", is in honor of the Count of Bonnal who collected amphibians and reptiles while living at Montgaillard, Hautes-Pyrénées. The Aran rock lizard was initially included here as a subspecies, "Iberolacerta bonnali aranica", but is now considered a distinct species, "Iberolacerta aranica". The Pyrenean rock lizard is a large lizard growing to a snout-to-vent length of with a tail about