Formative cells see prohemocyte

formic a. [L. formica, ant] (ARTHRO: Insecta) Of or pertaining to ants.

formic acid An organic acid naturally occurring in some hy-menopteran insects.

formicary n.; pl. -ies [L. formica, ant] (ARTHRO: Insecta) An ant's nest or dwelling; an ant-hill; a formicarium.

fornent prep. [A.S. for, fore; efen, even] Opposite to; facing; alongside.

fornicated a. [L. fornix, vault] Concave within, convex without; arched; vaulted.

fornix n.; pl. fornices [L. fornix, vault] 1. An arch or fold. 2. (ARTHRO: Crustacea) A ridge in the lateral part of the cephalon above insertion of antennal muscles in water fleas. 3. (MOLL: Bivalvia) The cavity on the inside under the hinge; the upper or convex shell of an oyster. fornical a.

fossa n.; pl. -sae [L. fossa, ditch] A depression or cavity.

fosse n.; pl. -ses [L. fossa, ditch] (CNID: Anthozoa) A groove between the collar and base of the capitulum in sea anemones.

fossette n. [L. dim. fossa, ditch] 1. A small, hollow, dimple or depression. 2. (MOLL: Bivalvia) Any socket; for example a socket for a cardinal tooth. 3. (PLATY: Cestoda) A ciliated, sensory pit.

fossil n. [L. fossilis, dug out] An organic relic of a previous geological period preserved by natural means in rock or softer sediments which afford information as to the character of the original organism.

fossoria n. [L. fossor, digger] 1. (ARTHRO: Insecta) Insects that burrow or dig, i.e., mole crickets, digger wasps, etc. 2. (nemata) The cheilostomal, outwardly movable teeth.

fossorial a. [L. fossor, digger] Fitted for or having the habit of digging.

fossula n.; pl. -lae; fossule, fossulet [L. dim. fossa, ditch] 1. A shallow fossa. 2. (ARTHRO: Insecta) Grooves on the head or sides of the prothorax, in which the antennae are concealed; a foveola. 3. (MOLL: Gastropoda) A shallow linear depression of the inner lip in some Cypraeidae.

fossulate a. [L. dim. fossa, ditch] Having slight hollows or grooves.

founder cells 1. Daughter cells from the early cleavages of the zygote, with potential to form the individual tissues and organs of the body. 2. (PORIF) Cells responsible for ray length during the secretion of calcareous spicules.

founder principle/effect The principle that when founders populate a new colony as an isolated entity, the population will contain only a small fraction of the total genetic variation of the parental population.

fourth axillary (ARTHRO: Insecta) In Hymenoptera and Or-thoptera wings, an axillary sclerite between the posterior notal process and the third axillary sclerite.

fovea n.; pl. -ae [L. fovea, pit] A small depression, pit, pocket; a fossa. foveolate a.

foveola n.; pl. -lae [L. dim. fovea, pit] 1. An extremely small pit; a small fovea. 2. (ARTHRO: Insecta) A small pit into which the antennae are inserted.

fractate a. [L. frangere, to break] Displaced; bent at an angle.

fractate antenna (ARTHRO: Insecta) An antenna with one very long joint with other annuli attached at angles.

fracture n. [L. frangere, to break] (ARTHRO: Insecta) The suture on the hemelytra of Heteroptera that separates the cuneus from the corium.

fragile a. [L. frangere, to break] Easily broken; delicate; thin and brittle.

fragmentation n. [L. frangere, to break] 1. Separated in parts or fragments. 2. Amitotic division. 3. (BRYO) Asexual production of a colony from a single or group of zooids from another colony.

frame n. [A.S. framian, fashion, prepare] (ECHINOD) A structure composed of pentagonal rings of small ossicles on the distal end of the tube feet.

frass n. [Ger. fressen, to devour] Insect larval excrement usually mixed with plant fragments.

free a. [A.S. freo, freedom] Unrestrained; motile; not attached.

free edge (ARTHRO: Crustacea) The line of contact of an ostra-cod shell between closed valves, except along hinge line marking the distal limit of the contact margin.

free-living Not attached or parasitic; capable of independent movement and existence. see sessile.

free margin (ARTHRO: Crustacea) All parts of an ostracod shell margin, except hingement.

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