preaxial a. [L. prae, before; axis, axle] On the anterior border or before the axis.
preaxillary excision (ARTHRO: Insecta) In hind wings of Hy-menoptera, a second notch of the apex of the first anal fold, just anterior of the first anal vein, in addition to the axillary notch.
prebascillary eyes (ARTHRO: Chelicerata) In Arachnida, the anterior lateral, posterior lateral and posterior median eyes that have the retinal nuclei in front of the light-sensitive rods. see postbascillary eyes.
prebasilare n. [L. prae, before; basis, base] (ARTHRO: Diplopoda) In the gnathochilarium, a narrow transverse sclerite, just basal to the mentum.
precardo n. [L. prae, before; cardo, hinge] (ARTHRO: Diplopoda) The distal joint of a two piece cardo.
precheliceral a. [L. prae, before; Gr. chele, claw; keras, horn] (ARTHRO: Chelicerata) Anterior to the chelicerae; the acron and the three or four embryological segments anterior to the cheliceral segment; segment I.
precibarium n. [L. prae, before; L. cibarius, pertaining to food] (ARTHRO: Insecta) A canal formed by the union of the epipharynx and the hypopharynx, providing a connecting link between the food canal of the maxillary stylets and the cibarial pump.
precipitin n. [L. praeceps, head long] A specific antibody developed in response to foreign protein in the blood.
precocious stages 1. Premature development. 2. An organ that appears earlier in the development of a species than in the development of other related species.
preconnubia n. [L. prae, before; connubium, marriage] The coming together of animals before mating season.
precornua n. [L. prae, before; cornu, horn] (ARTHRO: Insecta) In Diptera larvae, the cornua of the cephalo-basipharynx.
precosta n. [L. prae, before; costa, rib] (ARTHRO: Insecta) In some primitive forms, the small first wing vein.
precoxa n. [L. prae, before; coxa, hip] 1. (ARTHRO: Crustacea) When present, the segment of the protopod proximal to the coxa; pleuropod. 2. (ARTHRO: Insecta) see subcoxa. pre-coxal a.
precoxal bridge (ARTHRO: Insecta) That part of the thoracic pleuron anterior to the trochantin, usually continuous with the episternum and the basisternum; precoxale.
precursor n. [L. prae, before; currare, to run] 1. Element or substance that preceeds the final one. 2. Ancestor or ancestral part. see anlage, rudiment.
precursory cell A mother cell or metrocyte.
predaceous, predacious a. [L. preda, prey] Having the characteristics of a predator.
predator n. [L. praedator, plunderer] An animal that kills or renders its prey insensible in order to mostly or entirely consume it.
predictive value The capability of a classification to make predictions on newly employed characters or newly discovered taxa.
pre-epipod(ite) n. [L. prae, before; Gr. epi-, on; pous, foot] (ARTHRO: Crustacea) The laterally directed lobe of the coxa.
pre-episternum n. [L. prae, before; Gr. epi-, on; sternon, chest] (ARTHRO: Insecta) The anterior part of the epister-num marked off as a separate plate.
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