The (Decapoda) - Order
(Dendrobranchiata) - suborder

(Penaeoidea)
- infraorder

(Sergestoidea)
- infraorder
(Pleocyemata) - suborder

(Stenopodidea)
- infraorder

(Caridea)
- infraorder

(Astacidea)
- infraorder

(Glypheidea)
- infraorder

(Axiidea)
- infraorder

(Gebiidea)
- infraorder

(Achelata)
- infraorder

(Polychelida)
- infraorder
The Hermit Crabs
(Anomura)
- infraorder

(Brachyura)
- infraorder