fleshy filament (ARTHRO: Insecta) A flexible, attenuate process of the body wall on some butterfly larvae.
flex v. [L. flectere, to bend] To bend or curve back.
flexor a. [L. flectere, to bend] Pertains to muscle that serves to bend a limb at an articulation.
flexor surface A surface brought closer together when a jointed structure is bent at a joint.
flexuous a. [L. flexuosus, full of turns] Having gentle turns and windings in opposite directions; zigzag.
flexure n. [L. flexura, a winding] 1. A bending. 2. (MOLL) The progressing folding or warping of one or both valves.
float n. [A.S. flotian, float] An air filled sac used for buoyancy by an organism or its eggs.
floatoblast n. [A.S. flotian, float; Gr. blastos, bud] (bryo) A statoblast with a peripheral pneumatic annulus, with or without marginal hooks.
flocculent a.; pl. -li [L. floccus, lock of wool] Covered with a soft, waxy substance, often resembling wool; clinging together in bunches.
flocculus n.; pl. -li [L. floccus, lock of wool] (ARTHRO: Insecta) In Hymenoptera, a tuft of hairs on the posterior coxa.
flora n. [L. flos, flower] The plants or plant life of a region. see fauna, biota.
floricome n. [L. flos, flower; coma, hair] (PORIF) An elaborately branched hexaster spicule.
floscelle n. [L. flos, flower] (ECHINOD: Echinoidea) A flowerlike structure composed of bourrelets and phyllodes around the mouth.
flosculus n. [L. dim. flos, flower] (ARTHRO: Insecta) A small, crescent shaped, tubular anal organ with a central style, found in certain lantern flies (Fulgoridae).
fluted a. [OF. flaute] A channeled or grooved area.
fluviatile a. [L. fluviatilis, of a stream] Living in rivers; growing near or inhabiting rivers or fresh water.
fly-blow (ARTHRO: Insecta) An egg or larva of flesh flies.
focus n.; pl. foci [L. focus, central point] A particular region of disease; a localized region.
fold n. [A.S. folde, a fold] 1. A doubling or folding. 2. (BRACHIO) A major external elevation of the valve surface, convex in transverse profile and radial from the umbo. 3. a. (MOLL: Bivalvia) A broad undulation in the shell surface which is directed radially or comarginally. b. (MOLL: Gastropoda) The spirally wound ridge on the interior of a shell wall. see columellar fold, parietal fold.
folded membrane (ARTHRO: Insecta) In Cicadidae, a specialized membraneous area of the anterior wall of the ventral cavity of the sound-producing organ.
foliaceous a. [L. folium, leaf] Leaflike in appearance.
foliate a. [L. folium, leaf] Foliaceous; leaves, consisting of laminae or thin plates.
folioles a. [L. dim. folium, leaf] Having leaflike processes extending from a margin or protuberance.
folium n. [L. folium, leaf] (ARTHRO: Chelicerata) A pigmented design or pattern on the abdominal dorsum of some spiders.
follicle n. [L. dim. follis, windbag] Any small cavity, sac or tube.
follicle cells Epithelial cells surrounding the oocytes in the vitellarium, that in some species secrete on its external surface the chorion and perhaps function in a nutritional role.
follicular a. [L. dim. follis, windbag] Pertaining to or having follicles.
folliculate a. [L. dim. follis, windbag] Having, consisting of, or enclosed in a follicle or follicles.
fontanelle, fontanel n. [F. fontannella, little fountain] (ar-THRO: Insecta) In Isoptera, when present, a small circular or slit-shaped orifice of the frontal or cephalic gland near the center of the head, through which a liquid is emitted; a frontal pore.
food n. [A.S. foda, fodder] Any material that an organism obtains from the environment that yields energy or supplies matter for its growth.
food bodies (ARTHRO: Insecta) In Hymenoptera, secretions on the seeds and leaves of some plants used by ants as food.
food chain Food energy transferred from plants through a sequence of organisms in which each is food of a later member of the sequence.
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