any of a phylum (Brachiopoda) of marine animals with hinged upper and lower shells enclosing two armlike parts with tentacles that are used for guiding minute food particles to the mouth
See brachiopod in American Heritage Dictionary 4
(brāˈkē-ə-pŏdˌ, brăkˈē-)
noun
Any of various marine invertebrates of the phylum Brachiopoda, having bivalve dorsal and ventral shells enclosing a pair of tentacled, armlike structures that are used to sweep minute food particles into the mouth. Also called lampshell.