Ajotles or Mexican mole lizards (Bipes)
Ajotles belong to the only genus (Bipes) of the amphisbaenian family Bipedidae. They live in Mexico and are about 18-24 cm (7-9.5 in) long. All of the pinkish, elongated, worm-like, cylindrical body has annulations of scales behind the head. The head is rounded and short with a rounded snout and no ear openings. There is no neck and no ear openings. The snout is rounded and the vestigal eyes are beneath a transluscent scale on either side of the head . No ear openings are present.
These carnivorous, burrowing reptiles differ from other worm lizards as they have have two stubby forelimbs placed just behind the head (1). They use the shovel-like limbs and well-developed claws to scrape away soil while they burrow through the soil, rather like a mole (2), but can place the limbs in recessed areas alongside the body. The expanded ulnar scales on the limbs help to move soil as the animal digs through substrate. The overhanging flesh just behind the point of insertion of the front limb lets the ajotle reduce its circumference while it moves through a tunnel (3). The tail is short and blunt and breaks off along fracture planes if it is grabbed by a predator. Ajotles cannot regenerate a lost tail.
Ajotles live beneath debris, litter, rocks and the roots of small shrubs and grasses.
Predators include snakes and large predaceous arthropods. When an ajotle is picked up, it energetically jumps and writhes like an earthworm, contorting its body to avoid the grip of a predator. It keeps its head hidden and releases a foul smelling musk from the cloaca (3).
There are four species.
2) Gans (1998)
- Animal Diversity Web
- Gans, Carl (1998). Cogger, H.G., & Zweifel, R.G., ed. Encyclopedia of Reptiles and Amphibians. San Diego: Academic Press. pp. 216–217. ISBN 0-12-178560-2.
- ITIS (Integrated Taxonomic Information System). www.itis.gov.
- Latreille, P.A. in Sonnini, C.S., and P.A. Latreiile. 1801. Histoire naturelle des reptiles, avec figures desinées d'après nature; Tome II. Premiere partie. Quadrupèdes et bipèdes ovipares. Crapalet. Paris. 332 pp. (Bipes, pp. 90–96.)
- Taylor, E.H. 1951. Concerning Oligocene Amphisbaenid Reptiles. Univ. Kansas Sci. Bull. 34 (9): 521-579. (Bipedidae, p. 522.)
- Wikispecies. species.wikimedia.org/wiki/Bipes.