Abaycosa is a genus of spiders in the family Lycosidae (wolf spiders).

Distribution Abaycosa is found in South America, from Brazil to Argentina.

Etymology The genus name is a combination of "Abáy" and the common lycosid ending "-cosa". "Abáy" mens "spider" in the indigenous Chaná language that is spoken in the basins of the Paraná and Uruguay rivers.

Species , this genus includes two species:

Abaycosa nanica (Mello-Leitão, 1941) – Bolivia, Brazil, Paraguay, Uruguay, Argentina Abaycosa paraguensis (Gertsch & Wallace, 1937) – Paraguay, Uruguay, Argentina

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