†Xanthosia Bell 1863
Parent taxon: Etyidae according to C. E. Schweitzer et al. 2010
Sister taxa: Etyxanthosia, Guinotosia, Secretanella, Sharnia, Steorrosia
Subtaxa: Xanthosia americana, Xanthosia buchii, Xanthosia buteonis, Xanthosia danielae, Xanthosia elegans, Xanthosia fischeri, Xanthosia fossa, Xanthosia gibbosa, Xanthosia gracilis, Xanthosia granulosa, Xanthosia occidentalis, Xanthosia robertsi, Xanthosia sakoi, Xanthosia semiornata, Xanthosia similis, Xanthosia socialis, Xanthosia zoquiapensis
Type: Xanthosia fossa