After Martin & Davis, 2001

Alternative, older taxonomy after Parker, 1982

<==o Tanaidacea Dana, 1849
   |--o Tanaidomorpha Sieg, 1980
   |  |-- Tanaidae Dana, 1849 [Crossurinae] [Tanaoidea Dana, 1849]
   |  `--o Paratanaoidea Lang, 1949
   |     |-- Anarthruridae Lang, 1971 [Leptognathiidae]
   |     |-- Leptocheliidae Lang, 1973
   |     |-- Nototanaidae Sieg, 1976
   |     |-- Paratanaidae Lang, 1949
   |     |-- Pseudotanaidae Sieg, 1976
   |     |-- Pseudozeuxidae Sieg, 1982
   |     `-- Typhlotanaidae Sieg, 1986
   |-- Neotanaidae Lang, 1956 [Neotanaidomorpha Sieg, 1980]
   `--o Apseudomorpha Sieg, 1980 [Apseudoidea Leach, 1814; Monokonophora sensu Parker, 1982]
      |-- Anuropodidae Bacescu, 1980
      |-- Apseudellidae Gutu, 1972
      |-- Apseudidae Leach, 1814 [Apseudinae]
      |-- Gigantapseudidae Kudinova-Pasternak, 1978
      |-- Kalliapseudidae Lang, 1956
      |-- Metapseudidae Lang, 1970 [incl. Cyclopoapseudidae Sieg, 1984]
      |-- Pagurapseudidae Lang, 1970
      |-- Parapseudidae Gutu, 1981
      |-- Sphyrapidae Gutu, 1980
      |-- Tanapseudidae Bacescu, 1978
      |-- Tanzanapseudidae Bacescu, 1975
      `--o Whiteleggiidae Gutu, 1972
         |-- Leviapseudinae sensu Sieg, 1983 [Leviapseudidae]
         `-- Whiteleggiinae Gutu, 1972 sensu Sieg, 1983

Tanaidacea -families listed in Parker, 1982, but not recognized by Martin & Davis, 2001:

    Agathotanaidae
    Leptognathiidae
    Cirratodactylidae [an apseudomorph -family?]
    Leiopidae [an apseudomorph -family?]

Reference(s):