n. [Gr. mys, muscle; ostrakon, shell]
(MOLLUSCA: Bivalvia)
That part of the shell wall secreted at the attachment of the adductor muscles.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • 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

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