Mexican beaded lizard debate among scientists. However, this venom has been found to contain several enzymes useful for manufacturing drugs in the treatment of diabetes, and research on the pharmacological use of its venom is ongoing. Threatened throughout its range by overcollection and habitat loss, it is a CITES protected species. The Guatemalan beaded lizard ("H. charlesbogerti" ) is one of the rarest lizards in the world, with a wild population of fewer than 200. The beaded lizards have one close living relative, the Gila monster ("H. suspectum"), as well as many extinct relatives in the Helodermatidae, whose genetic history may be traced
Banded rock lizard Banded rock lizard The banded rock lizard ("Petrosaurus mearnsi" ) is a species of lizard in the family Phrynosomatidae. The species is native to western North America. The specific name, "mearnsi", is in honor of American naturalist Edgar Alexander Mearns, who collected the first specimens. "P. mearnsi" is endemic to extreme southern California and Baja California, Mexico. It also occurs on Isla El Muerto. "P. mearnsi" is an extremely flat-bodied lizard. Its dorsum is olive, brown or gray, with white or bluish spots. It has a single black collar, a banded tail, and granular scales on its body, with keeled