Genus Mirobisium Beier, 1931

Mirobisium Beier, 1931: 304–305; Beier, 1932: 169; Harvey, 1992: 1409; Harvey, 1996: 258.

Type species: Ideobisium cavimanum Beier, 1930

Remarks. The genus can be identified by the presence of a ventral depression on the chelal hand of male specimens, from which protrudes a spine, parallel to the chelal axis. The genus consists of five species, known only from mainland South America (Argentina, Bolivia and Chile).

Species included: Mirobisium cavimanum Beier, 1930, M. chilense Beier, 1964, M. dimorphicum Vitali-di Castri, 1970, M. minore Vitali-di Castri, 1970 and M. patagonicum Beier, 1964 .