Scientific name: Pachygrapsus crassipes
Common name: Striped Shore Crab
Range: Oregon to Baja California
More information: P. crassipes has a very close cousin, P. transversus (the Mottled Shore Crab), who occupies the Atlantic coast--from North Carolina south to Uruguay.
The above photo was taken near low tide at a Laguna Beach tidepool. I observed, several days later, that nearly all of the crabs encountered at a tidepool at high tide in nearby Corona del Mar were Striped Shore Crabs.
To find out more, including what these crabs eat, see this entry at VR Tidepool (a really old website).
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