periostracal glands
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periostracal groove — (MOLLUSCA: Bivalvia) The groove between the tentacular fold and the shell fold that houses the periostracal glands … Dictionary of invertebrate zoology
shell fold — 1. (ARTHROPODA: Crustacea) The part of the carapace behind the cephalon. 2. (MOLLUSCA: Bivalvia) The outer fold of the mantle edge that houses the periostracal glands at its base … Dictionary of invertebrate zoology