The Lined Shore Crab (Pachygrapsus crassipes) is common from southern Oregon (U.S.A.) to Baja California (Mexico), where it inhabits the upper portions of rocky shores. Its coloration is variable, ranging from greenish to blackish to reddish with transverse (often green or red) stripes running across the carapace. The large pincers are sometimes red or may have red or purple lines. The body width of a large specimen is about 3 to 5 cm. These crabs live under rocks and in crevices. They feed extensively on algae (e.g., green algae such as Ulva, see Sousa 1979), tearing them up with their pincers. Some animals are eaten as well, including limpets and small crabs. Typically, it feeds by bringing its left and right pincers alternately to its mouth. (Kozloff 1993; Sheldon 1999)
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