They are mainly characterized by their brown color, leading to them be colloquially referred to as ''Aranha marrom'' (Portuguese for brown spider) in Brazil, the body is characterized by a pale to dark brown color (often reddish), with a dorsal violin-shaped mark, slightly darker on the carapace, with long and slender legs, without dark marks or stripes.

Males have the thoracic region with the clearest impression, consisting of bands, with the anterior portion of the cephalothorax forming in the rear direction a '' V '' design, while pedipalps have the last short articles and curved stylus.

Like many recluse spiders, It is nocturnal, hunting preys such as insects and arthropods with their strong webs, and is more active in the hottest seasons of the year.

[3] A study with the venom of L. gaucho showed the main local bite reactions, such as pain, edema, erythema, ecchymosis, pallor and dermonecrosis, and systemic like Hemolysis.

[4] In the state of São Paulo alone, Brazil, it is responsible for causing viscerocutaneous loxoscelism in 3.1% of cases.