Idomene antarctica (Giesbrecht, 1902) accepted as Idomenella antarctica (Giesbrecht, 1902)
Idomene australis Brady, 1910 accepted as Xouthous australis (Brady, 1910)
Idomene cookensi Pallares, 1975 accepted as Xouthous cookensis (Pallares, 1975)
Idomene pusilla Brady, 1910 accepted as Xouthous pusillus (Brady, 1910)
Idomene simulans (Brady, 1910) accepted as Xouthous simulans (Brady, 1910)
Idomenella antarctica (Giesbrecht, 1902)
Pseudotachidius jubanyensis Veit-Köhler & Willen, 1999
Pseudotachidius minimus Brady, 1910
Xouthous antarcticus (Giesbrecht, 1902) accepted as Idomenella antarctica (Giesbrecht, 1902)
Xouthous australis (Brady, 1910) (uncertain > taxon inquirendum )
Xouthous cookensis (Pallares, 1975)
Xouthous pusillus (Brady, 1910)
Xouthous simulans (Brady, 1910)