fillets n. [L. filum, thread] Bands of fibers; any raised rib.
filose a. [L. filum, thread] Having a threadlike appendage, or terminating in a threadlike process.
filter apparatus (ARTHRO: Insecta) Opposing rows of tapering processes of some spiracular atrial walls, clothed with interlacing hairs, that permits passage of air and prevents foreign particles or water from penetrating into the atrium.
filter chamber An area that serves to filter suspended matter.
filter feeder An animal that feeds on small particles which it filters from the surrounding medium.
filum terminale (ARTHRO: Insecta) In Thysanura, tergite XI prolonged into a bristle.
fimbria n.; pl. -briae [L. fimbriatus, fringed] 1. A fringe-like structure. 2. (ARTHRO: Insecta) Ciliated hair terminating any part.
fimbriate a. [L. fimbriatus, fringed] 1. With finger-like projections; having a fringed or puckered margin. 2. (ARTHRO: Insecta) An antenna with joints bearing a lateral hair. 3. (MOLL: Gastropoda) A shell with an irregular margin.
fin n. [A.S. finn, fin] An extension of the body of an aquatic animal used in locomotion or steering.
finger n. [A.S. finger, finger] 1. Any structure resembling or used like a finger. 2. (ARTHRO: Crustacea) a. In Decapoda, one of the scissor-like blades at the end of the cheliped, usually one is movable and one fixed. b. In Ostracoda, a dorsal and ventral process of the male copulatory apparatus which are thought to be tacticle organs and may also assist in directing or holding certain structures during copulation.
finger guard (ARTHRO: Crustacea) In male Ostracoda genitalia, an extension of the ventral cardo alongside the dorsal and ventral fingers.
firmatopore n. [L. firmus, strong; porus, hole] (BRYO: Stenol-aemata) In Tubuliporina, a degenerate zooid that appears as a slender, proximally directed tubule.
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