aphidicolous a. [NL. aphis, plant-louse; L. colere, to dwell] (ARTHRO) Pertaining to associating with aphid colonies, as certain ants.
aphidilutein n. [NL. aphis, plant-louse; L. luteus, yellow] The yellowish liquid found in plant lice. see aphins.
aphidivorous a. [NL. aphis, plant-louse; L. vorare, to devour] Feeding on aphids.
aphins n.pl. [NL. aphis, plant-louse] Fat soluble pigments derived from various aphids that impart a purple or black color to the whole insect.
aphodus n.; pl. aphodi [Gr. aphodos, departure] (PORIF: Desmospongiae) The short channel connecting the flagellated chamber with the excurrent canal. see prosodus.
aphorism n. [Gr. aphorizein, to define] The concise definition of a principle.
aphotic zone That zone of ocean water that lies below 800 meters and which receives little or no light.
aphototropic a. [Gr. an, without; phos, light; tropein, to turn] Turning away from light.
aphrodisiac pheromone (ARTHRO: Insecta) A pheromone that facilitates copulation.
aphytal zone Those waters in which the penetration of light is too poor to support photosynthesis.
apian a. [L. apianus, of bees] Of or pertaining to bees.
apiary n.; pl. -ies [L. apiarium, beehive] The area where bees are kept; a collection of hives maintained for honey production.
apicad adv. [L. apex, tip; ad, toward] Toward the apex.
apical a. [L. apex, tip] Refers to the apex or top, as of a conical or spherical structure.
apical angle 1. (ARTHRO: Insecta) The angle of a wing at its apex. 2. (MOLL: Gastropoda) In a plane through the axis, that angle subtended between two straight lines that touch adjacent whorls on opposite sides near the apex; identical with the spire angle if whorls increase at a regular rate.
apical area 1. (ARTHRO: Insecta) see petiole. 2. (MOLL: Poly-placophora) The short part of the periostracum and tegmentum on the head and intermediate valves that is adjacent to the posterior dorsal edge of a valve and which extends over the edge and onto the ventral side.
apical carina (ARTHRO: Insecta) In ichneumonid Hymenoptera, the posterior transverse carina.
apical cell 1. A cell situated at the apex of a structure distinguished by location, shape, size and function. 2. (ARTHRO: Insecta) Apical testicular cell of Orthoptera, Dictyoptera, Diptera and Homoptera, and some Lepidoptera, that supplies mitochondria to the spermatogonial cytoplasm during spermatogenesis; Verson's cell; Versonian cell. 3. (NEMATA) An epithelial cell that forms the gonoduct wall.
apical chamber (ARTHRO: Insecta) Pertaining to the germar-ium in the acrotrophic egg tubes.
apical cross vein (ARTHRO: Insecta) A cross vein near the apex of the wing.
apical field (ROTIF) The central anterior unciliated area of the corona.
apicalia n. [L. apex, tip] (GNATHO) Paired sensory cilia on the head.
apical lip notches (nemata) Indented lip margins at the junction of the lips.
apical margin (ARTHRO: Insecta) The outer margin of the wing. see costal margin, anal margin.
apical organ A sensory organ located at the apex of tro-chophore larvae and some cestodes.
apical orifice (MOLL) An opening at the top or apex of a shell.
apical plate An external sensory organ of a primitive nervous system or cluster of nerve cells at the anterior pole of the body of certain arthropods and annelids.
apical scutellars (ARTHRO: Insecta) In Diptera, the apical pair of marginal bristles on the scutellum; sometimes refers to the sub-apical scutellars, when the true apicals are absent.
apical spur 1. (ARTHRO: Insecta) The short bristles on the ventral surface of the tibia. 2. (MOLL) The initial pointed plug forming a posterior septum in truncate shells.
apical system (ECHINOD: Echinoidea) Plates surrounding the body organs of sea-urchins, found at the dorsal or aboral pole of the test. see coronal system.
apices pl. of apex apicobasal ridge or furrow (ARTHRO: Crustacea) A longitudinal feature of barnacles, dividing the tergum from the remaining valve.
apiculate a. [L. dim. apex, tip] Pertaining to a short, abrupt point or points.
apiculture n. [L. apis, honeybee; cultura, cultivation] (ARTHRO: Insecta) The culturing of bees; beekeeping.
apiculus n. [L. dim. apex, tip] Any small apical tip or point.
apid venom gland (ARTHRO: Insecta) A type of venom gland in which the single venom gland is widened into a saclike reservoir that contains glandular elements, but no muscles. see braconid venom gland.
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