Gerrhonotus infernalis

Texas Alligator Lizard (Gerrhonotus infernalis)

The Texas alligator lizard, scientifically known as Gerrhonotus infernalis, is a notable reptile species within the Gerrhonotinae subfamily of the Anguidae family. It holds the distinction of being the largest lizard native to Texas and is among the largest alligator lizards found globally. This species is primarily found in the rocky hillsides of Central Texas, extending its range southward into northern Mexico, where it often seeks refuge among stones or within limestone crevices.

Description and Physical Characteristics

Gerrhonotus infernalis is characterized by its substantial size, with adults potentially reaching a total length of 24 to 25 inches (61 to 64 cm). Its head is distinctively flat and wedge-shaped, and its body is covered in very stiff, plate-like scales, which contribute to its heavily armored appearance. The typical coloration of an adult is a yellow-brown hue, often adorned with darker brown and white checker patterns across its dorsal surfaces. In contrast, its ventral side is usually a uniform light color, such as white or grey. A significant physical adaptation is its tail, which can detach to distract potential predators and possesses the remarkable ability to regrow over time. The coloration and patterning of the Texas alligator lizard undergo noticeable changes from hatching to maturity; hatchlings display a striking metallic brown with well-defined white crossbands, while adults exhibit a more subdued pattern that can fade with advanced age.

Behavior and Diet

As a diurnal species, the Texas alligator lizard is active during the day and possesses keen eyesight. While generally not aggressive, it is known to bite if handled, and this behavior, coupled with its formidable appearance, has led to a widespread misconception that it is venomous. Its diet is primarily composed of insects and other invertebrates. However, it is an opportunistic feeder and has been known to supplement its diet with nestling birds or small rodents.

Reproduction

Reproduction in Gerrhonotus infernalis is notable for its potential to occur year-round, with females sometimes producing multiple clutches of eggs within a single year. While females have been observed to remain near their nesting sites, presumably to protect them, there is no evidence of parental care once the young hatch. The hatchlings emerge small, typically around 3 to 4 inches (7.6–10.2 cm) in length, and often display more vibrant markings than the adults.