Grapsidae, MacLeay, 1838

Wicksten, Mary K., 2012, Decapod Crustacea of the Californian and Oregonian Zoogeographic Provinces 3371, Zootaxa 3371, pp. 1-307 : 263

Key to species of family Grapsidae

1. Carapace broader than long, somewhat trapezoidal, marked with grooves. Anterior edges of pereopods 2–5 without thick fringe of setae. Intertidal............................................................. Pachygrapsus crassipes

– Carapace as long as or longer than broad, subcircular, smooth. Anterior edges of pereopods 2–5 with thick fringe of setae. Pelagic, usually found among floating debris or on sea turtle................................................... 2

2. Lateral margins of carapace convex, front with slight median depression. Upper margin of cheliped rounded... Planes major

– Lateral margins of carapace straight, front straight. Upper margin of cheliped angled.................... Planes marinus