extrapallial
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extrapallial space — (MOLLUSCA: Bivalvia) A narrow muscus filled space between the mantle lobe and the valve of the shell … Dictionary of invertebrate zoology
Mollusc shell — Closed and open shells of a marine bivalve, Petricola pholadiformis. A bivalve shell is composed of two hinged valves which are joined by a ligament … Wikipedia
