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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.
Not closing completely, leaving an opening (1) between the valves when the ADDUCTOR MUSCLES are fully contracted (i.e., byssal gape, see figure), or (2) in a partially fused MANTLE (i.e., pedal gape) (figure: Arca imbricata).
- See CTENIDIA.
- Gland of Deshayes
- See ORGAN OF DESHAYES.
- Sexually mature animals in which males and females are separate; also called dioecious.
Grainy, covered in granules.
- An elongated sculptural element that is depressed below the surrounding shell surface; see also RIB, STRIA (figure: Thracia morrisoni).
- GROWTH LINE
- A COMMARGINAL line (usually fine) on the external valve surface that indicates the position of an earlier growth stage.
- A curviplanar external support for a SIMPLE dorsal LIGAMENT.