The umbo (plural umbones or umbos) is the vaguely defined, often most prominent, highest part of each valve of the shell of a bivalve or univalve mollusc.

Jan 5, 2023 · The umbo, beak, and hinge are on the dorsal (back) side of the valves in most bivalves, although positions vary depending on shell shape. Bivalves open along the opposite …

Jan 26, 2001 · A bivalve is characterized by possessing two shells secreted by a mantle that extends in a sheet on either side of the body. The oldest part of the shell, the umbo , can be …

In most bivalves (including Mercenaria), the umbo points towards the anterior side and the ligament and escutcheon towards the posterior side. The side of the shell with the hinge is …

Another important bivalve found in Cedar Key Genus: Crassostrea Species: virginica Latin for “thick” oyster Called eastern, Virginia, American Native to Atlantic and Gulf coasts Today, <1% …

About the external shell, the convex "hump" at the top of the shell is called umbo. Describing bivalves, it’s necessary to pay attention to the hinge (cardinal area). Within it can be a variety …

Aug 26, 2020 · The umbo, and its tip which is called the peak, is the first part of the shell secreted. Not all bivalve shells have an umbo. In those that do the umbo often seems to point to one …

Lucina exasperata has a heterodont hinge, with fewer but larger and differently sized hinge teeth. Rising above the hinge line on each valve is a swelling called the umbo, the oldest part of the …

Bivalves do not have obvious head or tail regions, but anatomical terms used to describe these areas in other animals are applied to them. The umbo or hinge area, where the valves are …

Growth can be traced from the first stage (prodissoconch) at the umbo (rounded or pointed extremity) to the latest stage at the ventral margin. The shells of many bivalve species are …