Funnel shaped see infundibulum

furca n.; pl. -cae [L. furca, fork] 1. Any forked process. 2. (ARTHRO: Crustacea) The caudal furca; cercopod. 3. (ARTHRO: Insecta) a. The cercopods; the forked sternal process arising from the thoracic sternum of pterygote insects formed by the sternal apophyses, supported on a medium inflection; referred to as pro-, meso, or metafurca. b. In Collembola, the modified abdominal jumping appendages. see furcula. c. In some male Lepidoptera, the sclerotized structure of the juxta. d. For furca of the labellum, see la-

bellar sclerite. furcae maxillares see superlinguae furcal arms see sternal apophyses furcal ramus see caudal ramus furcapectinae see pectina furcasternal suture (ARTHRO: Insecta) In pterygote insects, the internal median longitudinal line formed at the point of meeting the mesopleurosternal ridges of opposite sides and confluent with the mesosternal ridge.

furcasternum n. [L. furca, fork; sternum, breast] (ARTHRO: Insecta) 1. In apterygote insects, that area of the thoracic sternum separated from the basisternum by the sterna-costa. 2. In pterygote insects, the bases of the sternal apophyses form the furca, the sternacosta is lost, and the separation of the basisternum and furcasternum is usually obscure.

furcate a. [L. furca, fork] Forked; having two divergent branches from a common base.

furcate plates see pectina furcella see spina furcilia n. [L. dim. furca, fork] (ARTHRO: Crustacea) In Euphausiacea, the larval stage following the calyptopis (mysis type) with stalked and movable compound eyes and with thoracic and abdominal appendages; antennae not used for locomotion.

furcina n. [L. dim. furca, fork] (ARTHRO: Insecta) The outer surface of the sternum bearing an invaginated furca. see furcasternal suture.

furcocercous cercariae (PLATY: Trematoda) Cercariae with forked tails into which the body is not retractable; divided into several groups: 1. Bucephalus group (including gasterostomes). 2. Lophocercous group (apharyngeate, monostome cercariae). 3. Apharyngeate or ocellate group. 4. Pharyngeate, nonocellate group. 5. Suckerless apharyngeate group.

furcocystocercous cercariae see cysticercariae cercariae furcula n.; pl. -lae [L. dim. furca, fork] (ARTHRO: Insecta) 1. The forked springing apparatus of springtails; furca. 2. In Hymenoptera, a small sclerite of the anterior sting base which depresses, raises and rotates the sting of bees. fur-cular a.

furculate a. [L. dim. furca, fork] Having a furcula.

furrow n. [A.S. furh, trench] A groove separating parts, divisions or segments of an invertebrate body.

furrow spines (ECHINOD: Asteroidea) Spines on the adambu-lacral plates that protect the ambulacral furrow.

fuscescent a. [L. fuscus, dusky] Having a dusky or somber hue.

fuscous a. [L. fuscus, dsky] Brown or grayish black; dusky.

fused a. [L. fundere, to pour] Pertaining to being united, blended or run together.

fused phobal mass (ARTHRO: Insecta) In certain scarabaeoid larvae, the large, coalesced group of phobae located on each side of the pedium, slightly anterior to the tormae.

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