myostracum
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hypostracum — n. [Gr. hypo, under; ostrakon, shell] 1. (ARTHROPODA: Chelicerata) In Acari, the inner cuticular layer, usually pigmented with basic dyes. 2. (MOLLUSCA: Bivalvia) a. Inner layer of shell wall laid down by the mantle. b. That part of the shell… … Dictionary of invertebrate zoology
