umboniform

umboniform
adj. [L. umbo, knob or boss; forma, shape]
1. Like or shaped like an umbo.
2. (MOLLUSCA: Gastropoda)
Having a low blunt or rounded spire, nearly lenticular in shape; see rotelliform.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • rotelliform — adj. [L. dim. rota, wheel; forma, shape] (MOLLUSCA: Gastropoda) Almost lenticular, but with a low obtuse spire; see umboniform …   Dictionary of invertebrate zoology

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