umbonal angle

umbonal angle
(MOLLUSCA: Bivalvia)
In pectinoid shells, the angle of divergence of the umbonal folds; in other shells the divergence of the posterodorsal and anterodorsal parts of the longitudinal profile.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • umbo — n.; pl. umbones, umbos [L. umbo, knob or boss] 1. (ARTHROPODA: Crustacea) a. In Cirripedia, a portion of the plate from which successive growth increments extend. b. In bivalves, apical portion of either valve; see beak. 2. (ARTHROPODA: Insecta)… …   Dictionary of invertebrate zoology

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