Pea crab
Animal
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The pea crab, Pinnotheres pisum, is a small crab in the family Pinnotheridae that lives as a parasite in oysters, clams, mussels, and other species of bivalves. Wikipedia
Scientific name: Pinnotheres pisum
Class: Malacostraca
Family: Pinnotheridae
Genus: Pinnotheres
Kingdom: Animalia
Order: Decapoda
Phylum: Arthropoda