The lifespan of these lizards was published in the past to be around thirty years. I personally know of three animals that lived well over fifty, one of which was captured as a young adult in 1969 and is still alive and well. In my opinion Heloderma horridum can live up to seventy years or longer in optimum conditions. Females, average adult size is 24-30 in and two and a half to four pounds. Males, average adult size is 28- 34 in and three to five pounds. Exceptionally large males can reach 40in and close to ten pounds.
The Mexican Beaded Lizard and the Gila Monster are the only two venomous lizards in the world. The Beaded Lizard’s name in Latin consists of the two words Heloderma horridum. Heloderma, meaning nail studed skin, and horridum, meaning horrible (horrible studded lizard). Heloderma lizard's skin consists of several tiny beads called ostioderms. Each bead contains a tiny piece of bone that gives them an armor like plated skin.
Beaded Lizards can reach sexual maturity at three and a half to four years old, although I have successfully bred them at three. In H.horridum and H.exasperatum, once oviposition occurs the incubation period at 80-84F is 180-185 days. In H.alvarezi the incubation time at the same temperature is one hundred fifty to one hundred fifty five days (S.Angeli, Q. Dwyer 2020). At about those periods of time the hatchlings will pip their head out of the egg. It usually takes two or three days for them to come all the way out, absorbing their yolk sack and ingesting the liquid content of their egg. Newly hatched neonates are usually five to six inches and weigh around 25- 40 grams. Until the animals are substantial in size, sexing is nearly impossible. Males generally have broader heads and longer necks, with females having narrower heads and shorter necks, although there’s always exceptions to every rule.
Types of Beaded Lizards
Class: Reptilia Order: Squamata Family: Helodermatidae
• Heloderma horridum
• Heloderma charlesbogerti
• Heloderma alvarezi
• Heloderma exasperatum