- umbonal reflection
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(MOLLUSCA: Bivalvia)The reflection of the dorsal margin of the valves anterior to and usually over the umbos.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.