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

 
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4(1). Small suborbital spine (S) at dorsolateral edge of antennal basipodite; dactyl of chelae articulating in oblique plane; postorbital ridges (PR) always very strongly expressed

Note: This is a generalised drawing, the other numbers are not relevant to this couplet.

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suborbital spine present
postorbital ridges strongly expressed

-Without small suborbital spine at dorsolateral edge of antennal basipodite (AB); dactyl (D) of chelae articulating in vertical plane; postorbital ridges never very strongly expressed

Note: Engaeus laevis is an exception.
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Engaeus 

suborbital spine absent
postorbital ridges not strong

Engaeus  

dactyl articulating in vertical plane

Engaeus 

postorbital ridges never strong