Dyspnoi

The Dyspnoi are one of the most biogeographically conserved higher groups of harvestmen. With the exception of Acropsopilioidea, none occur in the Southern Hemisphere, and most families are restricted along temperate regions. The only exceptions are some Ortholasmatinae (Nemastomatidae) inhabiting the tropics on high mountains in Mexico (Ortholasma bolivari) and northern Thailand (Dendrolasma angka).

• Acropsopilionoidea
  • Acropsopilionidae (3 genera, 19 species)[1]
• Ischyropsalidoidea
  • Ischyropsalidoidea Incertae sedis
    • Crosbycus dasycnemus[2][3]
    • Hesperonemastoma (5 species)[2][3]
  • Ischyropsalididae
    • Ceratolasmatinae (2 genera, 8 species)[2]
    • Ischyropsalidinae (1 genus, 23 species)[2][4][5]
  • Sabaconidae (1 genus, 57 species)[2][6][7]
  • Taracidae (2 genera, 17 species)[2][3][8]
• Troguloidea
  • Dicranolasmatidae (1 genus, 16 species)[2]
  • Nemastomatidae
    • Nemastomatinae (18 genera, 123 species)[2][9][10][11][12][13][14][15][16]
    • Ortholasmatinae (7 genera, 27 species)[2][17][18][19][20][21]
  • Nipponopsalididae (1 genus, 3 species)[2]
  • Trogulidae (5 genera, 57 species)[2][22]
• †Halithersidae monotypic, Burmese amber, Myanmar, Cenomanian