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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.
- Burrow of Gastrochaenidae, especially referring to those built within soft sediment or cemented superficially to hard substratum; also called crypt.
Composed of scales or scale-like parts overlapping like roof tiles or shingles (figure: Pinctada imbricata).
- INCURRENT APERTURE or SIPHON
Aperture or siphon, usually posterior, rarely anterior, that controls water intake into the MANTLE CAVITY; also known as branchial, pallial, or inhalant aperture/siphon (figure: Mercenaria mercenaria).
Having the UMBO closer to one end of the valve than to the center (figure: Modiolus squamosus).
Having valves of dissimilar shape or size, i.e., one valve larger than the other (figure: Varicorbula limatula).
- Living buried within sediment; see also EPIFAUNAL.
- INFRABRANCHIAL CHAMBER
Body cavity ventral to the gills; see also SUPRABRANCHIAL CHAMBER (figure: Mercenaria mercenaria).
- INFRASEPTAL CHAMBER
Body cavity ventral to the branchial SEPTUM, analogous to infrabranchial chamber in bivalves with non-septibranch gills; see also SUPRASEPTAL CHAMBER (figure: Poromyidae).
- INHALANT SIPHON
- See INCURRENT SIPHON.
- See ENTIRE.
- INTERLINEAR SCAR
Pallial line connecting the anterior end of the sinus with the anterior adductor muscle scar, occurring in such families as Tellinidae.
- INTERNAL LIGAMENT
Type of LIGAMENT that attaches at or below the level of the HINGE TEETH or (if EDENTATE) near the ventral edge of the shell margin; see also EXTERNAL LIGAMENT, LIGAMENT, RESILIUM (figure: Spisula similis).
- See HINDGUT, MIDGUT.
HINGE type characterized by secondary teeth and sockets, often resembling a ball-and-socket arrangement, on either side of a central RESILIUM; occurring in such families as Spondylidae and Plicatulidae (figure: Spondylus americanus).
Having equally or nearly equally sized ADDUCTOR MUSCLES (figure: Mercenaria mercenaria).