Bivalve Anatomy

The shells comprise of a calcareous exterior produced by the mantle. The valves are connected to one another at a hinge.

Mollusks Bivalves Marine Biology New Jersey Scuba Diving

There is a cavity the mantle cavity between the mantle and the body wall proper.

Bivalve anatomy. Bivalves as a group have no head and they lack some usual molluscan organs like the radula and the odontophore. Two adductor muscles reduced to one in some species that hold the shell tightly closed. These shells join at the umbo the oldest part of the shell at the dorsal end of each shell www3.

A hinge ligament made of elastic protein joins the two halves of the shell together and large adductor muscles between the two valves hold them closed. Bivalves are characterised by their two symmetrical laterally compressed shells www2. Important features of bivalve shells are.

Bivalvia ˈ b aɪ v æ l v i ə in previous centuries referred to as the lamellibranchiata and pelecypoda is a class of marine and freshwater molluscs that have laterally compressed bodies enclosed by a shell consisting of two hinged parts. It has three layers and protects the main organs of the bivalve the visceral mass. Bivalve anatomy as well as their reproductive behavior.

Just pick an audience or yourself and itll end up in their incoming play queue. Bivalve molluscs are completely enclosed by a shell made of two valves hinged at the top. Bivalves are aquatic animals much lower on the evolutionary scale from humans but a definite link exists along the way to our complex selves.

Within the shell is a fleshy layer of tissue called the mantle. It has three layers and protects the main organs of the mollusk. A hinge with a series of interlocking teeth that keep the valves.

Calcareous casing produced by the mantle. An elastic ligament that springs the shell open when the muscles relax. Bivalve class bivalvia any of more than 15000 species of clams oysters mussels scallops and other members of the phylum mollusca characterized by a shell that is divided from front to back into left and right valves.

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Pdf Bivalvia