Areole see areola

areolet n. [L. dim. area, small open space] (ARTHRO: Insecta) A small cell in a wing.

argentaffin a. [L. argentum, silver; affinis, related] Of or pertaining to the taking of a silver stain; an argyrophil.

argentaffin(e) cell Any cell that stains readily by silver techniques.

argenteous a. [L. argentum, silver] Silver-like, silvery, white, shinning.

argentophilic cells (ARTHRO: Insecta) In aquatic larvae, specialized cells for ion uptake in the anal papillae or rectal gill.

argillaceous a. [L. argilla, white clay] Containing or consisting of, or like clay; clayey.

argyrophil a. [Gr. argyros, silver; philein, to love] Pertains to staining readily with silver dyes; argentaffin.

arista n.; pl. -tae [L. arista, awn] A bristlelike appendage.

aristate a. [L. arista, awn] Having an arista; aristate antenna.

aristopedia n. [L. arista, awn; podos, foot] (ARTHRO: Insecta) A developmental deviation in which the arista may mature as a leg.

Aristotle's lantern (ECHINOD: Echinoidea) A complicated masticating apparatus consisting of several ossicles surrounding the mouth of sea urchins; called Aristotle's lantern because it resembles an early Greek lantern.

aristulate a. [L. dim. arista, awn] Bearing a short bristle.

ark n. [L. arca, chest] (MOLL: Bivalvia) A marine arcoid bivalve with an equivalve shell; a heavy box-like shell; an ark-


arm n. [A.S. arm, forelimb] 1. Anything resembling or corresponding to an arm. 2. (ECHINOD) a. In Asteroidea, the radial extension of the body surrounding the axis; the ambulacra. b. In Crinoidea, the radial evagination of the body extending from the theca; undivided distal branches. 3. (ECHI) The forked section of the proboscis. 4. (MOLL: Cephalopoda) a. In squids and cuttlefish, eight of the ten short and heavy appendages around the head, the other two larger dorsal appendages being tentacles. b. The tentacles of an octopod.

armate cercaria (PLATY: Trematoda) A larva of the xiphidio-cercariae group with oral and ventral suckers unequal, without a virgula organ and with a Y-shaped excretory bladder.

armature n. [L. armare, to arm] Defensive or protective structures of invertebrates, such as spinous or chitinous processes in the form of hooks, horns, teeth, spines and claws on various parts of the body.

armilla n.; pl. -lae [L. armilla, bracelet] Bearing a bracelet-like ring or annulus. armillate a.

arolium n.; pl. -ia [Gr. arole, protection] (ARTHRO: Insecta) A medium lobe or pad-like cushion of the foot. a. Between the claws of Orthoptera. b. The base of each tarsal claw of Hemiptera. c. Between the tarsal claws and comprising part of the pretarsus of Hymenoptera. see pseudarolium.

aromorphosis n.; pl. -ses [Gr. airein, to raise; morphosis, shaping] An advancement in organization of an organism, without a marked increase in specialization; an aromorph. see allomorphosis.

arrhenogeny n. [Gr. arrhen, male; genos, offspring] The condition of producing only male offspring. see monogeny, thelygeny.

arrhenoidy n. [Gr. arrhen, male; eidos, form] (NEMATA: Se-cernentea) Sex reversal from female to male; recognized by males having two testes, instead of one. arrhenoid a.

arrhenoplasm n. [Gr. arrhen, male; plasma, formed or molded] The male element of idioplasm.

arrhenotoky n. [Gr. arrhen, male; tokos, birth] The haplodip-loid parthenogenesis in which males arise from unfertilized, haploid egg cells. see thelyotoky.

arsenosomphic a. [Gr. arsen, male; somphos, porous] (ANN: Oligochaeta) Pertaining to earthworms with male termina-lia.

artatendon n. [L. artus, joint; tendere, to stretch] (ARTHRO: Insecta) The tendon articulating the post-tarsus.

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