The (Harpacticoida) - order
() - suborder
()

(Adenopleurellidae)
- family

(Aegisthidae)
- family

(Ameiridae)
- family

(Ancorabolidae)
- family

(Arenopontiidae)
- family

(Argestidae)
- family

(Balaenophilidae)
- family

(Cancrincolidae)
- family

(Canthocamptidae)
- family

(Canuellidae)
- family

(Cerviniidae)
- family

(Chappuisiidae)
- family

(Cletodidae)
- family

(Cletopsyllidae)
- family

(Clytemnestridae)
- family

(Cristacoxidae)
- family

(Cylindropsyllidae)
- family

(Dactylopusiidae)
- family

(Danielsseniidae)
- family

(Darcythompsoniidae)
- family

(Ectinosomatidae)
- family

(Euterpinidae)
- family

(Hamondiidae)
- family

(Harpacticidae)
- family

(Heteropsyllidae)
- family

(Huntemanniidae)
- family

(Idyanthidae)
- family

(Ismardiidae)
- family

(Laophontidae)
- family

(Laophontopsidae)
- family

(Latiremidae)
- family

(Leptastacidae)
- family

(Leptopontiidae)
- family

(Longipediidae)
- family

(Louriniidae)
- family

(Metahuntemanniidae)
- family

(Metidae)
- family

(Miraciidae)
- family

(Neobradyidae)
- family

(Normanellidae)
- family

(Novocriniidae)
- family

(Orthopsyllidae)
- family

(Parameiropsidae)
- family

(Paramesochridae)
- family

(Paranannopidae)
- family

(Parastenheliidae)
- family

(Parastenocarididae)
- family

(Parastentheliidae)
- family

(Peltidiidae)
- family

(Phyllognathopodidae)
- family

(Porcellidiidae)
- family

(Protolatiremidae)
- family

(Pseudotachidiidae)
- family

(Rhizothricidae)
- family

(Rhynchothalestridae)
- family

(Rometidae)
- family

(Rotundiclipeidae)
- family

(Superornatiremidae)
- family

(Tachidiidae)
- family

(Tegastidae)
- family

(Tetragonicipitidae)
- family

(Thalestridae)
- family

(Thompsonulidae)
- family

(Tisbidae)
- family

(Zosimidae)
- family