Fixed hairs see microtrichia

fixed jaw (ARTHRO: Chelicerata) In Acari, the distal (fixed) part of the cheliceral segment.

fixed-wall colony (BRYO: Stenolaemata) Feeding zooids with oral walls attached to the body apertures.

flabellate a. [L. flabellum, fan] Having fanlike processes or projections. flabelliform a.

flabellum n.; pl. -la [L. flabellum, fan] 1. Any leaflike or fanlike process. 2. (ARTHRO: Crustacea) The thin distal exite of a branchiopod; or epipodite of a thoracopod. 3. (ARTHRO: Insecta) A transparent distal lobe of the glossa of bees; bouton.

flaccid a. [L. flaccus, flabby] Lacking firmness or elasticity; limp; limber.

flagellate a. [L. flagellum, whip] 1. Having flagella or whip-like structures. 2. Having a lash-like appendage as the terminal part of an antenna.

flagellated chamber (porif) Cavities lined with coanocytes.

flagelliform a. [L. flagellum, whip; forma, form] Flagella-like; whip-like; lash-like.

flagellomere n. [L. flagellum, whip; Gr. meros, part] (ARTHRO: Insecta) In Diptera, an individual subdivision or unit of the antennal flagellum; in mosquitoes 13-14 flagellomeres.

flagellum n.; pl. -lums, -lla [L. flagellum, whip] 1. Any of various whiplike appendages. 2. A protoplasmic process, longer than a cilium, whose movements usually effect locomotion of the cell. 3. The whip-like tip of the male copu-latory organ in some invertebrates. 4. (ARTHRO: Crustacea) The multiarticulate distal portion of the antennule, antenna, or exopod. 5. (ARTHRO: Insecta) The distal portion of an insect antenna beyond the second segment (pedicel). see flagellomere. 6. (PORIF) A long projection from a cell, used as a propeller.

flame bulb Common name for solenocytes.

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