Taxa included

Ax, P. (2001). Multicellular animals: the phylogenetic system of the Metazoa. Springer-Verlag, Berlin, Heidelberg, New York II.

Taxon
Hesperolpium slevini (Chamberlin, 1923) (Pseudoscorpiones: Hesperolpiidae) n/a, figs 55b, d (as Hesperolpium sleveni [sic]), Hesperolpium slevini (Chamberlin)
Serianus carolinensis Muchmore, 1968 (Pseudoscorpiones: Garypinidae) n/a, fig. 55k, Serianus carolinensis
Pselaphochernes scorpioides (Hermann, 1804) (Pseudoscorpiones: Chernetidae) n/a, figs 55h-j, Pselaphochernes scorpioides (Hermann)
Neobisium (Neobisium) simoni (L. Koch, 1873) (Pseudoscorpiones: Neobisiidae) n/a, fig. 55e, Neobisium simoni (L. Koch)
Chelifer macrochelatus Tömösváry, 1884 (Pseudoscorpiones: Cheliferidae) n/a, fig. 55c, Cordylochernes macrochelatus (Tömösváry)
Microcreagris sequoiae Chamberlin, 1930 (Pseudoscorpiones: Neobisiidae) n/a, fig. 55f, Microcreagris sequoiae
Chernes cimicoides (Fabricius, 1793) (Pseudoscorpiones: Chernetidae) n/a, fig. 55g, Chernes cimicoides (Fabricius)
Obisium muscorum Leach, 1817 (Pseudoscorpiones: Cheliferidae) n/a, figs 55a, l, Neobisium muscorum (Leach)