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Category Archives: Critters

Lined Shore Crab

P1010914 (1)

Spotted San Francisco Bay, April 2013

Pachygrapsus crassipes Randall, 1839
Phylum Arthropoda, Subph. Crustacea, Class Malacostraca, Subcl. Eumalacostraca, Superorder Eucarida, Order Decapoda,  Infraorder Brachyura, Family Grapsidae

Lined shore crab; carapace trapezoidal with 2 antero-lateral teeth on each side; dark green-black with red or purple highlights on appendages; broken transverse lines across top of carapace, 40-45 mm across.

Abundant, but fast, cryptic & pugnacious; high to mid-intertidal zone, exposed & protected outer coast; feeds on algal films & scavenges.

Geogr. Range: central Oregon to Baja