1) Arthropod family 2) Family pinnotheridae 3) Tiny soft-bodied crabs 
The Pinnotheridae are a family of tiny soft-bodied crabs that live commensally in the mantles of certain bivalve molluscs (and the occasional large gastropod mollusc species in genera such as Strombus and Haliotis). The earliest fossils attributable to the Pinnotheridae date from the Danian. ==Genera and species== This is a comprehensive list of s...
[n] - tiny soft-bodied crabs
family Pinnotheridae noun tiny soft-bodied crabs