primordial valve

primordial valve: Chitinous plate in Cirripedia (Lepadomorpha and Verrucomorpha) having a distinctive honeycomb appearance, developing at incipient umbones of terga, scuta and carina, during metamorphosis [Moore and McCormick, 1969].

One of 5 chitinous plates (scuta, terga, and carina) in cyprid larvae of lepadomorphs and verrucomorphs, site of calcification during metamorphosis, sometimes visible at umbones of these plates in adults [McLaughlin, 1980].

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primordial valve — (ARTHROPODA: Crustacea) In Lepadomorpha and Verrucomorpha Cirripedia, one of 5 chitinous plates of cyrpid larvae … Dictionary of invertebrate zoology
primordial plate — (Subclass Cirripedia): One of typically five more rigid, plate like elements under shell of cypris larva. (Syn. primordial valve) [Stachowitsch, 1992] … Crustacea glossary
sinoatrial valve — sinuatrial valve the valve at the opening of the sinus venosus into the primordial right atrium … Medical dictionary
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