Shield back kelp crab
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Pugettia producta, known as the northern kelp crab or shield-backed kelp crab, is a species of crab in the family Epialtidae. Wikipedia
Scientific name: Pugettia productus
Family: Epialtidae
Class: Malacostraca
Domain: Eukaryota
Genus: Pugettia
Phylum: Arthropoda