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Found several of these dead on the beach in Crescent City. One had funky orange stuff in his shell but most were barely the outer shell broken among the surf.
its a mole crab and i think orange stuff is an egg mass
These are so neat!! My dad called them "mud buddies". When I was a kid I remember sitting at the edge of the water & digging after them every time the water would roll back out. (This was on the east coast though.) Sorry you only saw deceased ones.
Mole crab. Pacific Mole Crab I think http://bugguide.net/node/view/603684
Looks like a Sand Flea, but there are different types. I don't know the family that this one belongs to.
The yellow stuff is egg mass.
Lat: 41.74, Long: -124.18
Spotted on Jun 14, 2016 Submitted on Jun 16, 2016