Definitions

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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Citing this glossary: For individual definitions, please cite the specific author(s) of the definition.
To cite the glossary as a whole, please use:
Martin, J.W., N.D. Pentcheff, D. Striley, C. Perrodin, A.R. Wall, J. Wall, and J. Zieba (editors). Crustacea Glossary. Crustacea Department, Natural History Museum of Los Angeles County. Accessed: 21 Nov 2024. URL: https://research.nhm.org/glossary