Cosmochthonius Berlese, 1910

Cosmochthonius plumatus suramericanus Hammer, 1958

Material examined: Esquel: Mulinum spinosum (4), Adesmia campestris (5), Gobernador Costa: Mulinum spinosum (1), Alto Rio Senguer: bare soil (1). The species was only recorded under shrub steppe.

Records in Argentina: Salta (Fredes 2018).

Comments: the distribution of species is Neotropical, U.S.A. (New Mexico), and India (Tripura) (Subías 2004, update 2018). First record for the province of Chubut.