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,
Short-tailed horned lizard Mexican states of Puebla and Oaxaca. It may also inhabit Veracruz. Short-tailed horned lizard The short-tailed horned lizard ("Phrynosoma braconnieri" ) is an uncommon species of horned lizard endemic to Mexico. It has a very distinct, shortened tail, which is sometimes not apparent. The specific epithet, "braconnieri", is in honor of French naturalist Séraphin Braconnier. "P. braconnieri" has a very short tail relative to its body length, the shortest of the horned lizards, or indeed of any lizard, thus its common name. "P. braconnieri" inhabits pine-oak woodland and xeric thorn-scrub. It can also be found in corn fields or other