false umbilicus (MOLL: Gastropoda) A cavity or depression in the base of the last whorl of the shell; a pseudumbilicus.
famulus n.; pl. -li [L. famulus, servant] (ARTHRO: Chelicerata) In Acari, microsensory seta found on the genu, tibia and tarsi.
fan n. [A.S. fann, fr. L. vannus, fan] 1. A segment or process flattened and spread triangularly or in a semicircle, appearing fan-like. 2. (ANN: Polychaeta) The parapodia on the l4th, 15th, or 16th segments. 3. (CNID: Anthozoa) A colony of zooids. 4. A flabellum.
fang n. [A.S. fang, seizure] (ARTHRO: Chelicerata) The clawlike distal segment of the chelicera of spiders.
farctate a. [L. farctus, filled] Fully filled; distended; to swell out.
farinaceous a. [L. farina, flour] 1. Mealy. 2. (ARTHRO: Insecta) Has been used to describe powdery looking insect surfaces and wings; pulverulent; pollinose.
fascia n., pl. -ciae [L. fascia, bundle] 1. A broad and well-defined band of color; striped. 2. Marked with transverse bands of color. see vitta. 3. A layer of connective tissue covering an organ or attaching a muscle. fasciate a.
fascicle, fasciculus n.; pl. -li, -les [L. dim. fascia, bundle] 1. A small bundle or tuft. 2. A bundle of nerve or muscle fibers. 3. (ANN) A bundle of setae originating from a common muscular source, normally two dorsolateral and two ventrolateral fasciculi per segment. 4. (ARTHRO) A stylet bundle or combination of mouthparts of blood-feeding arthropods that function to pierce the skin. 5. (CNID) Tubes intergrown together to form a stem or branches. 6. (MOLL: Polyplacophora) A bundle of hairs or bristles against each valve end. 7. (PORIF) Fibers intertwined in bundles to produce complex interlocking tracts.
fasciole n. [L. dim. fascia, bundle] 1. (CNID: Echinoidea) In Spatangidae, a small band of minute spine-bearing tubercles used to produce water currents in the burrow for feeding, respiration and excretion. 2. (MOLL: Gastropoda) A spiral band formed by the successive growth lines on the edges of a canal.
fascio-maculata Having spots arranged in bands.
fascio-punctate Ornamented with colored points arranged in bands.
fastening or fixing muscle (SIPUN) A thin strand or filament of muscle joining or attaching some part of the alimentary canal, (the esophagus or posterior region of the intestine) to the body wall.
fastigiate a. [L. fastigium, gable end] Arranged into a conical bundle.
fastigium n. [L. fastigium, gable end] (ARTHRO: Insecta) In Orthoptera, the anterior dorsal surface of the vertex of grasshoppers.
fat body Aggregated cells that store food reserves, storage for excretory materials, or light producing organ; a center in which many metabolic processes occur.
fate map Diagrammatic method of indicating the fate of embryonic cells.
fauces n.pl. [L. fauces, gullet] That portion of the interior of a spiral shell that can be viewed by looking into the aperture.
fauna n. [L. Faunus, diety of herds and fields] The animal life of a region. see flora, biota.
faunal region An area where certain groups of animals are found.
faveolate a. [L. favus, honeycomb] Pitted; having depressions or cells resembling a honeycomb; favose.
feces n.pl. [L. faex, dregs] Pertaining to sediment, refuse or excrement.
fecula n. [L. dim. faex, dregs] (ARTHRO: Insecta) Excrement.
fecundate v.t. [L. fecundus, fruitful] To fertilize; to impregnate.
fecundity n. [L. fecundus, fruitful] The potential reproductive capacity as measured by the quantity of gametes, particularly eggs, produced.
feedback mechanism Regulation mechanism in cells by which the final product of a metabolic reaction inhibits further production of that product.
feeding zooid (bryo) A zooid that at some developmental stage feeds and provides nourishment to the entire colony.
feeler n. [A.S. felan, to feel] A tactile organ of many invertebrates.
felt chamber (ARTHRO: Insecta) A spongy structure within the spiracular chamber of larval trypetid flies, thought to act as an air filter.
felt setae (ANN: Polychaeta) In scale worms, threadlike setae that arise from the notopodia and trail back over the dorsal surface of the animal.
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