 Metacarcinus gracilis

The graceful rock crab or slender crab, Metacarcinus gracilis (the naming convention recognized by WoRMS) or Cancer gracilis (the naming convention recognized by ITIS), is one of only two members of the genus "Metacarcinus," recognized by WoRMS, whose chelae (claws) are white tipped, the other crab being "M. magister" (Dungeness crab).Both of these eastern Pacific crab species are recognized by ITIS as belonging to the much larger genus Cancer.