Glossary

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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.

I

IGLOO
Burrow of Gastrochaenidae, especially referring to those built within soft sediment or cemented superficially to hard substratum; also called crypt.
IMBRICATE
IMBRICATE fig.Composed of scales or scale-like parts overlapping like roof tiles or shingles (figure: Pinctada imbricata).
INCURRENT APERTURE or SIPHON
INCURRENT APERTURE or SIPHON fig.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).
INEQUILATERAL
INEQUILATERAL fig.Having the UMBO closer to one end of the valve than to the center (figure: Modiolus squamosus).
INEQUIVALVE
INEQUIVALVE fig.Having valves of dissimilar shape or size, i.e., one valve larger than the other (figure: Varicorbula limatula).
INFAUNAL
Living buried within sediment; see also EPIFAUNAL.
INFRABRANCHIAL CHAMBER
INFRABRANCHIAL CHAMBER fig.Body cavity ventral to the gills; see also SUPRABRANCHIAL CHAMBER (figure: Mercenaria mercenaria).
INFRASEPTAL CHAMBER
INFRASEPTAL CHAMBER fig.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.
INTEGREPALLIATE
See ENTIRE.
INTERLINEAR SCAR
INTERLINEAR SCAR fig.Pallial line connecting the anterior end of the sinus with the anterior adductor muscle scar, occurring in such families as Tellinidae.
INTERNAL LIGAMENT
INTERNAL LIGAMENT fig.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).
INTESTINE
See HINDGUT, MIDGUT.
ISODONT
ISODONT fig.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).
ISOMYARIAN
ISOMYARIAN fig.Having equally or nearly equally sized ADDUCTOR MUSCLES (figure: Mercenaria mercenaria).