Identificaciones de crabsandshrimps

No visible shell- hope it’s doing alright

Small shrimp (~2cm), well camouflaged. Found under seaweed. Arched its tail upward when I approached.

Recruited in open-flow aquaria. Very young individual.

Salinity about 1.012, potentially lower as the refractometer used could have had some old salt residue

Appears to be a cottid ssp but I've had great difficulty finding a probable species. Any help would be appreciated.

Being eaten by immature glaucous-winged gull.

Brought onto Wet Deck at the Santa Barbara Museum of Natural History Sea Center for observation.