Umbo (bivalve)
Videos
The umbo is the vaguely defined, often most prominent, highest part of each valve of the shell of a bivalve or univalve mollusc. It usually contains the valve's beak, the oldest point of the valve, an
A left valve of a juvenile Mercenaria campechiensis viewed from the dorsal aspect in order to show the brown-tinted lunule on the right, next to the forward facing umbo.
A side view of a whole shell of Cucullaea labiata (Lightfoot, 1786), the umbones are at the top of the image
Hinge teeth
Videos
Hinge teeth are part of the anatomical structure of the inner surface of a bivalve shell, i.e., the shell of a bivalve mollusk. Bivalves by definition have two valves, which are joined together by a s
A close-up photograph of the hinge teeth of a nut clam
Arcidae hinge
Glycymerididae hinge
Mytilidae hinge