An Illustrated and Cross-Referenced Glossary of
Malacological and Conchological Terms
|by Paul S. Mikkelsen|
In bivalves, the earliest part formed, = UMBO; any part which is drawn out like a beak or ROSTRATED. See illustration: Composite Bivalve.
See: Bivalve terminology, Anatomy of bivalves by Marlo Krisberg.
In cephalopods, the CHITINOUS plates of the mouth, which resemble the beak of a parrot.
See the excellent "Cephalopod Glossary" by Richard E. Young, Michael Vecchione, and Katharina M. Mangold.
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