Opinions from J. W. Martin and G. E. Davis 2001
- 'Akentrogonida belongs to Rhizocephala'
- 'Amphionidacea belongs to Eucarida'
- 'Amphionidae is replaced by Amphionididae'
- 'Amphionides belongs to Amphionidae'
- 'Amphionididae belongs to Amphionidacea'
- 'Amphipoda belongs to Percarida'
- 'Anaspidacea belongs to Syncarida'
- 'Anomura belongs to Pleocyemata'
- 'Anostraca belongs to Sarsostraca'
- 'Apygophora belongs to Acrothoracica'
- 'Arguloida belongs to Branchiura'
- 'Ascothoracica is corrected as Ascothoracida and belongs to Thecostraca'
- 'Astacidea belongs to Pleocyemata'
- 'Bathynellacea belongs to Syncarida'
- 'Brachypoda was reranked as a order and belongs to Cephalocarida'
- 'Brachyuri is corrected as Brachyura and belongs to Pleocyemata'
- 'Branchiopoda belongs to Crustacea'
- 'Branchiura belongs to Maxillopoda'
- 'Calanoida belongs to Gymnoplea'
- 'Caridea belongs to Pleocyemata'
- 'Cephalobaenida belongs to Pentastomida'
- 'Cephalocarida belongs to Crustacea'
- 'Cirripedia was reranked as a infraclass and belongs to Thecostraca'
- 'Copepoda was reranked as a subclass and belongs to Maxillopoda'
- 'Ctenochelidae belongs to Thalassinidea'
- 'Cyclopoida belongs to Podoplea'
- 'Decapoda belongs to Eucarida'
- 'Dendrobranchiata belongs to Decapoda'
- 'Dendrogastrida belongs to Ascothoracida'
- 'Diogenidae belongs to Paguroidea'
- 'Diplostraca belongs to Phyllopoda'
- 'Eucarida belongs to Malacostraca'
- 'Eumalacostraca belongs to Malacostraca'
- 'Euphausiacea belongs to Eucarida'
- 'Facetotecta belongs to Thecostraca'
- 'Galatheidae belongs to Anomura'
- 'Gelyelloida belongs to Podoplea'
- 'Gymnoplea belongs to Neocopepoda'
- 'Halocyprida belongs to Myodocopa'
- 'Harpacticoida belongs to Podoplea'
- 'Hepatidae belongs to Brachyura'
- 'Hoplocarida belongs to Malacostraca'
- 'Isopoda belongs to Peracarida'
- 'Kentrogonida belongs to Rhizocephala'
- 'Laurida belongs to Ascothoracida'
- 'Leptostraca belongs to Phyllocarida'
- 'Levinebalia belongs to Leptostraca'
- 'Malacostraca was reranked as a class and belongs to Crustacea'
- 'Maxillopoda belongs to Crustacea'
- 'Metalimnadia belongs to Limnadiidae'
- 'Mimilambrus belongs to Parthenopoidea'
- 'Misophrioida belongs to Podoplea'
- 'Monstrilloida belongs to Podoplea'
- 'Mormonilloida belongs to Podoplea'
- 'Myodocopa belongs to Ostracoda'
- 'Myodocopida belongs to Myodocopa'
- 'Mystacocaridida belongs to Maxillopoda'
- 'Nectipoda belongs to Remipedia'
- 'Neocopepoda belongs to Copepoda'
- 'Notostraca belongs to Phyllopoda'
- 'Ostracoda belongs to Crustacea'
- 'Palinura belongs to Pleocyemata'
- 'Parthenopoidea belongs to Brachyura' according to Martin and Davis 2001
- 'Pedunculata belongs to Thoracica'
- 'Pentastomida was reranked as a subclass and belongs to Maxillopoda'
- 'Percarida belongs to Eumalacostraca'
- 'Phyllocarida belongs to Malacostraca'
- 'Phyllopoda belongs to Branchiopoda'
- 'Pilumnidae belongs to Xanthoidea'
- 'Platycopida belongs to Podocopa'
- 'Platycopioida belongs to Progymnoplea'
- 'Pleocyemata belongs to Decapoda'
- 'Podocopa belongs to Ostracoda'
- 'Podocopida belongs to Podocopa'
- 'Podoplea belongs to Neocopepoda'
- 'Poecilostomatoida belongs to Podoplea'
- 'Porocephalida belongs to Pentastomida'
- 'Progymnoplea belongs to Copepoda'
- 'Pygophora belongs to Acrothoracica'
- 'Remipedia belongs to Crustacea'
- 'Retroplumidae belongs to Heterotremata'
- 'Rhizocephala belongs to Cirripedia'
- 'Sarsostraca belongs to Branchiopoda'
- 'Sessilia belongs to Thoracica'
- 'Siphonostomatoida belongs to Podoplea'
- 'Stenopodidea belongs to Pleocyemata'
- 'Stomatopoda belongs to Hoplocarida'
- 'Syncarida belongs to Eumalacostraca'
- 'Tantulocarida belongs to Maxillopoda'
- 'Thalassinidea belongs to Decapoda'
- 'Thecostraca belongs to Maxillopoda'
- 'Thoracica was reranked as a superorder and belongs to Cirripedia'
- 'Triops belongs to Notostraca'