Chelicerata Heymons, 1901
Arachnida and/or Pantetrapulmonata Shultz, 2007
1 Genus †Ecchosis Selden & Shear, 1991, incertae sedis
2 Genus †Idmonarachne Garwood, Dunlop, Selden, Spencer, Atwood, Vo & Drakopoulos, 2016, incertae sedis
3 Genus †Saccogulus Dunlop, Fayers, Hass & Kerp, 2006, incertae sedis
4 Genus †Xenarachne Dunlop & Poschmann, 1997, incertae sedis