40 (35) Carapace not laterally expanded over walking legs; unevenly spinose .... Parthenope pourtalesii 



Figure 77. — Parthenope pourtalesii, 

 carapace and right cheliped. 



40 (35) Carapace more or less laterally expanded forming a vault overlying and concealing 



walking legs; nearly smooth Heterocrypta granulata 



Figure 78. — Heterocrypta granulata, 

 carapace and left cheliped. 



41 (34) Body round or transversely ellipsoid 42 



41 (34) Body quadrate; squared and broadest in front, occasionally somewhat narrowed 



and rounded 58 



42 (41) Free living crabs with parallel sided mouth frame 43 



42 (41) Small, usually commensal crabs with reduced eyes; adult females often with carapace 



somewhat membranous; mouth frame transversely somewhat ellipsoid or kidney 



shaped Family Pinnotheridae 56 



43 (42) Legs (especially last pair) more or less flattened for swimming Family Portunidae 44 



43 (42) Legs not flattened for swimming 49 



28 



