Exhibits a highly flattened dorsoventral morphology that allows it to easily slip into extremely narrow crevices. Adult specimens can reach a leg span of 3 to 4 inches (approximately 7 to 10 centimeters), while the body length alone measures around 0.8 to 1.2 inches. Its overall coloration is predominantly brownish, grayish, or yellowish, decorated with a mottled pattern that provides exceptional camouflage against tree bark. Dark transversal bands are prominent on its cursorial legs, and its prosoma features radial dark stripes. The ventral side of the abdomen displays a distinct pattern of dark lines or spots against a lighter background, a key diagnostic feature within the Sparassidae family. The chelicerae are robust and prominent, often fringed with striking reddish or orange hairs at their base.

Geographical distribution: Occurs natively and abundantly throughout the southern cone of South America. Its geographic range covers vast territories of Argentina (with dense populations in the provinces of Buenos Aires, Córdoba, Santa Fe, and the northeastern Mesopotamia region), the entire territory of Uruguay, several regions of Paraguay, and the southernmost states of Brazil, particularly Rio Grande do Sul.

Habitat: Prefers temperate and subtropical ecosystems. In wild environments, it is closely associated with the bark of trees such as Eucalyptus and Salix, as well as beneath fallen rocks and dense leaf litter. However, it displays remarkable synanthropic tendencies, adapting seamlessly to urban and suburban areas where it regularly frequents domestic gardens, sheds, ceilings, and the interior of houses, seeking shelter behind furniture, picture frames, or wall cracks.

Feeding: Follows an exclusively carnivorous diet, specializing in insectivory. Being an active cursorial hunter that does not rely on webs to capture prey, it stalks and ambushes a wide variety of invertebrates. Its diet consists mainly of cockroaches, moths, crickets, flies, and beetles. Its hunting strategy relies on stealth combined with lightning-fast sprints, injecting venom to quickly immobilize its prey before digesting and consuming its bodily fluids.

Behavior: Displays strictly nocturnal habits, spending daylight hours hidden inside temporary silken retreats. It is not an aggressive species toward humans; when confronted, its primary defense mechanism is rapid escape, facilitated by its laterigrade locomotion (the ability to run sideways). Its bite, although painful due to the mechanical action of its large chelicerae, is not considered medically significant, causing only mild local swelling and transient pain in most cases.

Reproduction: Undertakes its reproductive cycle during the warmer seasons of spring and summer. The mating ritual is complex, with the male producing rhythmic vibrations on the substrate to soothe the female and prevent sexual cannibalism. Following successful copulation, the female constructs a flat, circular, whitish silk egg sac (ootheca) containing hundreds of eggs. She displays strong maternal care, actively carrying the egg sac underneath her body using her pedipalps and chelicerae, or guarding it fiercely within a nursery web until the spiderlings hatch and eventually disperse.

Conservation status: Has not been officially assessed by the International Union for Conservation of Nature (IUCN) and is currently not listed under any global threat category. Given its extensive geographic range, robust adaptability to human-modified landscapes, and ecological importance as a natural controller of pest insects, the species is considered highly abundant and stable, requiring no targeted conservation efforts.