The Collaborative International Dictionary
Pinnothere
Pinnothere \Pin"no*there\, n. [Gr. ? a pinna + ? an animal.] (Zo["o]l.) A crab of the genus pinnotheres. See Oyster crab, under Oyster.
Wiktionary
pinnothere
n. (context obsolete English) A small crab of the genus (taxlink Pinnotheres genus noshow=1), which live symbiotically in the shells of certain molluscs. (17th-19th c.)