Bivalve shell - Wikipedia
A bivalve shell is the enveloping exoskeleton or shell of a bivalve mollusc, composed of two hinged halves or valves. The two half-shells, called the "right valve" and "left valve", are joined by a ligament and usually articulate with one another using structures known as "teeth" which are situated along the hinge line .
Bivalve | Definition, Characteristics, Species, Classification, & Facts ...
bivalve, (class Bivalvia), any of more than 15,000 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. The valves are connected to one another at a hinge.
Bivalvia - Wikipedia
Bivalvia (/ b aɪ ˈ v æ l v i ə /) or bivalves, in previous centuries referred to as the Lamellibranchiata and Pelecypoda, is a class of aquatic molluscs (marine and freshwater) that have laterally compressed soft bodies enclosed by a calcified exoskeleton consisting of a hinged pair of half-shells known as valves.
What is a bivalve mollusk? - NOAA's National Ocean Service
2024年6月16日 · Bivalve mollusks (e.g., clams, oysters, mussels, scallops) have an external covering that is a two-part hinged shell that contains a soft-bodied invertebrate. A roughfile clam from the Flower Garden Bank National Marine Sanctuary—just one of many different bivalve mollusk species.
Size and Shape: Up to 2.5 inches. Oblong (similar to native littlenecks but more oval). Shell: Concentric rings with radiating line ridges. Siphon tips are split. Color can vary—typically grey, brown, or mottled. Some purple on the inside shell. Depth: 2-4 inches. Habitat: Gravel, mud, sand. Above the half-tide level.
Bivalves - Types, Examples, Characteristics, Anatomy, Diet, & Habitat
2024年5月31日 · Bivalves are a group of freshwater and marine mollusks with bilaterally symmetric and laterally compressed bodies encased in a characteristic two-part shell. They belong to the class Bivalvia, a term coined by Linnaeus (1758) from two Latin words, bis (two) and valvae (leaves of a door).
External Clam Shell Anatomy 1. Left valve or shell 2. Anterior or head 3. Posterior or tail 4. Dorsal or upper 5. Ventral or lower 6. Umbo (“beak”) •Oldest part of the shell 7. Growth ring Northern hard clam, Mercenaria mercenaria
Bivalve - Mollusk, Shell, Filter Feeder | Britannica
Bivalve - Mollusk, Shell, Filter Feeder: The bivalve shell is made of calcium carbonate embedded in an organic matrix secreted by the mantle. It has a simple nervous system; the head is absent. The digestive system comprises a complex stomach and a simple intestine.
Bivalve - Anatomy, Mollusk, Shells | Britannica
Bivalve - Anatomy, Mollusk, Shells: Bivalves have a symmetrical body that includes a mantle cavity, foot (where present), gills, anus, urogenital pores, and inhalant and exhalant chambers. They have paired labial palps in the mantle cavity that are used in feeding.
Class Bivalvia: The Wonders of Bivalves | Earth Life
2020年8月26日 · Bivalves possess a shell which is a part of their body and which acts as their exoskeleton. This shell is composed of two parts, a left side and a right side. Each shell valve also has an anterior and posterior edge.