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.

F

FENESTRA (pl. FENESTRAE)
See OSTIUM.
FILIBRANCH
FILIBRANCH fig. no. 1FILIBRANCH fig. no. 2Gill type characterized by a series of narrow elongated filaments, usually in the form of two demibranchs per side, which are interconnected laterally by CILIARY JUNCTIONS only (not tissue junctions), and with or without interlamellar junctions; see also ELEUTHERORHABDIC; occurring in such families as the pteriomorphian Arcoida (Arcidae, Noetiidae, Glycymerididae, Limopsidae, Philobryidae), Mytiloida (Mytilidae), some Pterioida (some Pteriidae, some Isognomonidae, some Malleidae), and Pectinoida (Propeamussiidae, Plicatulidae, and Anomiidae).
FILTER-FEEDING
Feeding type involving the filtering of organic particles from water by the gills, after which appropriately sized particles are transported to the mouth; see also SUSPENSION-FEEDING, DEPOSIT-FEEDING.
FLANGE
See UMBONAL REFLECTION.
FOOT
FOOT fig.Muscular organ at the ventral part of the visceral mass, used by contraction and expansion for locomotion, burrowing and/or anchoring a bivalve (figure: Laevicardium serratum).
FOSSETTE
(1) concave or V-shaped, submarginal, linear support for a SIMPLE dorsal LIGAMENT; or (2) see CARDINAL AREA.
FOURTH PALLIAL APERTURE
FOURTH PALLIAL APERTURE fig.Posteroventral opening in the fused MANTLE margin (along the ventral margin or near the base of the INCURRENT SIPHON) of various bivalves, used for rapidly discharging water and PSEUDOFECES from the MANTLE CAVITY when the ADDUCTOR MUSCLES suddenly contract; occurring in such families as Lyonsiidae, Periplomatidae, Thraciidae, some Hiatellidae, some Pharidae, and some Mactridae; see also PSEUDOFECES (figure: Lyonsiidae).