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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.
- One half of a bivalve's two shell halves.
- VALVULA, SEPTAL
- See SEPTAL VALVULA.
- VALVULAR MEMBRANE
Cone-shaped extension on the EXCURRENT SIPHON; occurring in such families as Hiatellidae, Trapezidae, Veneridae, Pharidae, Mactridae, Myidae, and Corbulidae (figure: Mercenaria mercenaria).
Planktonic larval type characteristic of most Mollusca, including bivalves, characterized by a ciliated locomotory organ (VELUM) which is either discarded or resorbed at metamorphosis; see also PERICALYMMA.
- (1) see PALLIAL VEIL, or (2) the locomotory organ of a VELIGER larva.
- The foot-side of a bivalve, opposite of DORSAL.
- Swollen, usually in the middle after the manner of an animal's belly.
- VERMICULAR CHOMATA
- See CHOMATA.
- VESICULA SEMINALIS
- See SEMINAL VESICLE.
- VISCERAL LOBE
- Lateral extension of the VISCERAL MASS in Lucinidae, containing part of the reproductive organs.
- VISCERAL MASS
Region of the bivalve body containing most of the digestive, excretory, circulatory, and nervous systems, that is suspended dorsally between the gills by pedal retractor muscles and that usually terminates ventrally as the foot (figure: Mercenaria mercenaria).
- VISCERAL RIM
Thickened margin of the small internal NACREOUS layer in most Malleidae (and at least one species of Isognomonidae) beyond which the MANTLE and gills can be withdrawn (figure: Malleus candeanus).