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,
Mexican horned lizard Mexican horned lizard The Mexican horned lizard ("Phrynosoma taurus") is a horned lizard species native to Mexico. Horned lizards are sometimes referred to as "horned toads" or "horny toads", although they are not toads. Compared to other members of the horned lizards (genus "Phrynosoma"), little is known about this species. It is known to live in the Sierra Madre del Sur, south and southeast of Mexico City, in the states of Guerrero and Puebla, Mexico. Its range partially overlaps with that of "Phrynosoma braconnieri". The Mexican horned lizard is a terrestrial species found in arid scrub, high desert, and even