Belongs to a family of robust, ground-dwelling arachnids characterized by their cursorial habits and impressive physical build. Females exhibit a body length ranging from 20 to 30 millimeters, while males are slightly smaller, possessing more slender bodies and comparatively longer legs. The cephalothorax features a dark brown or grayish ground color, adorned with a distinct, lighter median longitudinal band and faint radial stripes radiating toward the margins. The abdomen or opisthosoma displays a characteristic dorsal pattern, including a well-defined cardiac mark followed by symmetrical dark chevrons. Its legs are strong and heavily armed with sensory setae and spines that facilitate rapid bursts of speed. A key diagnostic feature is the presence of prominent chelicerae clothed in conspicuous reddish or orange hairs at the base, along with a distinct ocular arrangement of eight eyes in three rows: four small anterior eyes and four larger posterior eyes that provide exceptional binocular vision.

Geographical distribution: Occurs predominantly in the southern regions of South America, showing a highly localized endemism within the vast Pampas ecoregion. Its documented range is concentrated in central and eastern Argentina, particularly spanning the provinces of Buenos Aires, La Pampa, Córdoba, Santa Fe, and Entre Ríos, with its distribution limits reaching into southwestern Uruguay.

Habitat: Inhabits temperate grasslands, open plains, shrubby steppes, and fields dominated by low to medium herbaceous vegetation. This species demonstrates a moderate tolerance for human-modified landscapes, frequently establishing populations in agricultural fields, roadside verges, pastures, and suburban gardens. It relies closely on the soil surface, utilizing natural fissures, leaf litter, or excavating simple vertical burrows lined with silk to stabilize the walls and buffer environmental temperature fluctuations.

Feeding: Functions as an active, generalist predator that does not rely on capture webs to secure prey. Its diet consists of a diverse array of terrestrial invertebrates, with a strong preference for orthopterans (crickets and grasshoppers), coleopterans (beetles), lepidopterans (moths and caterpillars), and other smaller arachnids. To locate prey, it detects substrate-borne vibrations using specialized sensory hairs called trichobothria, combining this with its highly developed eyesight to stalk and pounce on targets before injecting digestive venom via its sharp fangs.

Behavior: Exhibits primarily solitary and nocturnal or crepuscular habits, remaining concealed during daylight hours beneath rocks, fallen logs, or deep within its burrow. At dusk, it emerges to actively patrol its territory. When confronted by potential threats, its primary response is rapid flight into dense vegetation; however, if cornered, it adopts a rigid defensive posture, raising its first two pairs of legs and flaring its chelicerae. Its venom is not considered medically significant to humans, and bites typically result only in mild, localized pain.

Reproduction: Begins with a complex courtship ritual initiated by the male, who detects the female’s pheromones and transmits rhythmic seismic signals by drumming his pedipalps and abdomen against the ground. Following successful copulation, the female constructs a spherical, grayish-white silk egg sac which she carries attached to her spinnerets. After incubation, the offspring emerge and immediately climb onto the maternal abdomen, where they are carried for several weeks until their first molt, at which point they disperse to lead independent lives.

Conservation status: Currently classified as Not Evaluated (NE) by the International Union for Conservation of Nature (IUCN), meaning it does not possess an official conservation rank. Despite this, local populations are increasingly threatened by habitat loss and fragmentation driven by intensive agricultural expansion, cattle overgrazing, and the widespread application of pesticides throughout the Pampean plains.