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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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928Maggenti and Gardnervalves, apical portion <strong>of</strong> either valve. see beak. 2. (AR-THRO: Insecta) In Coleoptera, an elevated knob on the humeralangle <strong>of</strong> the elytra. 3. (BRACHIO) Apical portion <strong>of</strong>either valve containing the beak. 4. (BRYO: Gymnolaemata)In Cheilostomates, a blunt knob on the front wall <strong>of</strong> theovicell. 5. (MOLL: Bivalvia) That region <strong>of</strong> the valve surroundingthe point <strong>of</strong> maximum curvature <strong>of</strong> the longitudinaldorsal pr<strong>of</strong>ile; when not coinciding with the beak, extendingto its base. umbonal a.umbonal angle (MOLL: Bivalvia) In pectinoid shells, the angle<strong>of</strong> divergence <strong>of</strong> the umbonal folds; in other shells the divergence<strong>of</strong> the posterodorsal and anterodorsal parts <strong>of</strong> thelongitudinal pr<strong>of</strong>ile.umbonal cavity (MOLL: Bivalvia) 1. Part <strong>of</strong> the valve interiorwhich lies within the umbo and under the hinge plate. 2. Inoysters, that part <strong>of</strong> the left valve interior lying in the umbonalregion beneath the ligamental area.umbonal depression (MOLL: Bivalvia) A depression at theumbo tip.umbonal fold (MOLL: Bivalvia) In pectinoid shells, a ridgeoriginating at the umbo and setting the auricle <strong>of</strong>f from theshell body.umbonal pole (MOLL: Bivalvia) The point <strong>of</strong> maximum curvature<strong>of</strong> the longitudinal pr<strong>of</strong>ile <strong>of</strong> the dorsal valve.umbonal reflection (MOLL: Bivalvia) The reflection <strong>of</strong> the dorsalmargin <strong>of</strong> the valves anterior to and usually over theumbos.umbonal region (MOLL: Bivalvia) The region <strong>of</strong> the umbo.umbonal spine (ARTHRO: Crustacea) In Conchostraca, a hollow,curved, looped or nodular spinose projection <strong>of</strong> variablesize, sometimes covering the entire umbo.umbone see umboumboniform a. [L. umbo, knob or boss; forma, shape] 1. Likeor shaped like an umbo. 2. (MOLL: Gastropoda) Having alow blunt or rounded spire, nearly lenticular in shape. seerotelliform.umbonuloid a. [L. umbo, knob or boss; Gr. eidos, like] (BRYO:

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