byssal notch
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byssal sinus — (MOLLUSCA: Bivalvia) Corresponds to the byssal notch of the right valve, but shallower and on the left valve in the Pectinacea … Dictionary of invertebrate zoology
ctenolium — n. [Gr. dim. kteis, comb] (MOLLUSCA: Bivalvia) In some Pectinacea, a comblike row of small teeth on the lower side of the byssal notch … Dictionary of invertebrate zoology
Claraia — Temporal range: 266–237 Ma … Wikipedia