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The glossary provided here is largely based on “Seashells of Southern Florida: Bivalves,” by Paula M. Mikkelsen & Rüdiger Bieler, Princeton University Press. Production of this glossary was funded in part by the National Science Foundation’s Partnerships in Enhancing Expertise in Taxonomy [PEET] Program, NSF-DEB-9978119, “Bivalves - Research, Training, Electronic Dissemination of Data” (1999-2008) to Bieler and Mikkelsen.
- Splitting, referring here to PERIOSTRACUM that is not adherent.
- See CTENIDIUM.
- Feeding type of some bivalves during which organic particles are harvested (by either the SIPHONS or PALP PROBOSCIDES) from the surface or near-surface sediments; see also SUSPENSION-FEEDING.
- HINGE type characterized by very reduced or absent teeth, in some cases replaced by accessory ridges along the valve margins, occurring in such families as Gastrochaenidae and Myidae.
- Ridge separating shell and siphonal chambers in the burrow or IGLOO of Gastrochaenidae; also called a SEPTUM.
- DIGESTIVE GLAND
- Highly branched organ surrounding the stomach within the visceral mass, into which edible food particles pass (through ducts from the stomach) and where digestion occurs; often darkly colored in living specimens, visible as a dark spot through the gills or a thin shell; in earlier literature, often called liver, midgut gland, or hepatopancreas.
Having both anterior and posterior ADDUCTOR MUSCLES (figure: Mercenaria mercenaria).
- See GONOCHORISTIC.
- DIRECT DEVELOPMENT
- Larval development type characterized by lack of a free-swimming stage (VELIGER) that can be absent entirely or passed entirely within an egg capsule or brooding chamber.
Branching, usually in reference to external radial sculpture (figure: Ctenoides sanctipauli).
- The HINGE side of a bivalve, opposite of ventral.
- DORSAL LIGAMENT
- See LIGAMENT.
Type of dorsal LIGAMENT that is AMPHIDETIC or OPISTHODETIC in position, and has alternating lamellar and fibrous layers, repeated as a series of parallel or oblique bands, giving the appearance of a series of nested chevrons; occurring in such families as Arcidae, Noetiidae (modified), and Glycymerididae.
HINGE type featuring small simple denticles close to the UMBONES, characteristic of some members of Mytilidae (figure: Brachidontes exustus).