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.

T

TAENIOID MUSCLES
Pallial retractor muscles in the fused ventral MANTLE margin of Verticordiidae (also Pholadomyidae and Parilimyida) that serve to retract the elaborate incurrent apparatus during prey capture.
TAXODONT
TAXODONT fig.HINGE type characterized by numerous undifferentiated similarly sized (usually small) vertical or oblique hinge teeth along the hinge plate, occurring in such families as Nuculidae, Manzanellidae, Nuculanidae, Yoldiidae, Arcidae, Noetiidae, Glycymerididae, Limopsidae, and Philobryidae (figure: Arca imbricata).
TEETH
See HINGE TEETH, MARGINAL DENTICLES.
THREAD
See RIB.
TRIMYARIAN
TRIMYARIAN fig.Having three ADDUCTOR MUSCLES, occurring in such families as Pholadidae and Teredinidae (figure: Teredinidae).
TRUNCATE
TRUNCATE fig.Abruptly cut off or appearing so, usually in reference to a squared-off end of a bivalve shell (figure: Spengleria rostrata).
TUBULE
In the shell, one of many pores extending from the inner surface through all or some shell layers, containing extensions (CAECA) of the MANTLE that probably secrete a chemical to deter boring organisms (although several other functions have been proposed, and none has been supported conclusively).
TUMID
Swollen or bulging.
TYPHLOSOLE
A ridge, commonly so described in molluscan digestive systems.