Characterized by a robust, stocky build, this saurian displays a large, triangular head that is clearly distinct from the neck region. Both males and females exhibit a snout-vent length ranging from 80 to 115 millimeters, reaching a greater total size when including the tail, which is relatively short, thick at its base, and tapered. The skin is covered with tiny, granular scales on the dorsal side, providing a soft and smooth texture, whereas the ventral scales are smooth and slightly larger. The color pattern is exceptionally cryptic and intricate, consisting of a background that varies between greyish, ocher, and yellowish hues, overlaid with a series of symmetrical dark blotches shaped like butterflies or dumbbells along the vertebral line. These markings are frequently outlined by thin white or pale yellow borders, enhancing its ability to blend seamlessly into the gravel, leaf litter, and sandy substrates typical of its natural environment.

Geographical distribution: Occurs as an endemic taxon in the southern region of South America, restricted entirely to the territory of Argentina. Its presence is recorded continuously from the arid central shrublands of the country down to the cold, windswept plateaus of southern Patagonia. It has been documented across the provinces of Mendoza, La Pampa, Neuquén, Río Negro, Chubut, and northern Santa Cruz. This distribution primarily encompasses the phytogeographic provinces of the Monte and the Patagonian Steppe, where geographical barriers and demanding climatic conditions have driven the evolutionary isolation of this lizard lineage belonging to the family Leiosauridae.

Habitat: Primarily colonizes arid and semi-arid environments characterized by extremely low rainfall and a high thermal amplitude both daily and seasonally. Its preferred habitat consists of sandy, clayey, or gravelly soils with open vegetation cover dominated by low-growing xerophytic shrubs such as creosote bush (Larrea spp.), neneo (Mulinum spinosum), and various species of tussock grasses known as coirones (Stipa spp.). It is a ground-dwelling reptile that utilizes the open spaces between vegetation patches to move, relying on the roots of thorny shrubs and deep soil cracks to seek refuge from extreme temperatures and aerial or terrestrial predators.

Feeding: Exhibits a predominantly insectivorous and opportunistic diet, highly adapted to the seasonal availability of prey in the harsh Patagonian steppes. It feeds on a diverse range of terrestrial arthropods, showing a clear preference for beetles of the families Tenebrionidae and Curculionidae, as well as ants, grasshoppers, and various insect larvae. Occasionally, it may ingest spiders, small scorpions, and soft plant matter, such as flowers or tender shoots, to supplement its water intake during prolonged dry spells. Its hunting strategy is based on passive ambush, remaining completely motionless and relying on its camouflage until a prey item wanders close enough to be snatched with a rapid snap of its jaws.

Behavior: Renowned for its diurnal habits and a passive defense strategy based entirely on extreme crypsis. Upon detecting a threat, this lizard tends to flatten its body against the substrate and mimic the texture and color of surrounding stones and dirt, remaining totally immobile even when touched directly. Its usual movement is slow and deliberate, although it is capable of fast, short bursts of speed to reach the protective cover of a nearby bush if cornered. It displays moderate heliothermic behavior, regulating its internal temperature by basking in the sun during the early morning hours, and later retreating to the shade of shrubs or underground burrows excavated by small rodents during the peak hours of solar radiation. During the coldest months of the Patagonian winter, it enters a deep state of brumation, hiding underground until the arrival of spring.

Reproduction: This reptile is oviparous, aligning its reproductive cycle with the seasonal rise in temperatures and increased food abundance of late spring and early summer. Following courtship and mating, the female selects a nesting site with moist, sandy soil, typically sheltered beneath the canopy of dense shrubs, to excavate a shallow burrow. The clutch size is variable, typically consisting of 2 to 6 flexible-shelled eggs. The incubation period depends directly on ambient temperatures, lasting approximately 60 to 75 days, after which fully developed, independent hatchlings emerge, receiving no parental care and relying on their own instincts from birth.

Conservation status: Populations are generally considered stable due to the vast and remote nature of its geographic range, earning it a classification of Least Concern (LC) under local assessments by the Asociación Herpetológica Argentina and global conservation guidelines. However, populations located at the northern limits of its range face growing threats from habitat fragmentation caused by sheep overgrazing, desertification, mining activities, and infrastructure development related to oil extraction in the Patagonian basin, all of which alter the soil structure and directly impact the availability of prey and natural shelters.