This is a beautiful Petrolisthes eriomerus (Flattop Crab) with a 1" carapace, a porcelain crab identified with its blue joints. It was under a rock during a minus tide.
This was an especially attractive shell selected by its Pagurus hirsutiusculus (Hairy Hermit).
What's a trip to the beach without finding sand crabs.
Hermit Crab found in rock pool in Te Kaha please help identify
San Diego County, California, US
Mass Strandings happening along San Diego Beaches
Observed in a lightning whelk shell in about 8 inches of water over sand/shell bottom. This is the common hermit crab of Texas bays. English common name is Thinstripe hermit crab.