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 Major Groups | Crustacea (crustaceans) | Malacostraca (malacostracans) | Decapoda (yabbies plus)

Note: Key from Horwitz et al. 1995

 
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1. Abdomen (A) folded tightly under cephalothorax, without tail fan; rostrum (R) markedly reduced or absent
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Hymenosomatidae 

abdomen under cephalothorax
tail fan absent
ventral view

Hymenosomatidae 

rostrum reduced

Parathelphusidae 

rostrum absent

-Abdomen (A) not folded tightly beneath thorax (T), bearing a tail fan (TF); rostrum (R) conspicuous

Note: Rostrum may be reduced in relative size in the subterranean forms.
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Atyidae 

abdomen not folded beneath thorax
tail fan present
rostrum conspicuous