Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

86Maggenti and Gardnerlatitude regions, that may or may not be inside the geographicalArctic Circle, from which tree growth is normallyabsent, but with plants and animals.arcticoid teeth (MOLL: Bivalvia) Heterodont teeth intermediatebetween corbiculoid and lucinoid types.arctogaea n. [Gr. arktos, bear; gaia, the earth] One of theprimary zoogeographic zones comprising North America(except Central America), Europe, Asia and Africa.arcuate a. [L. dim. arcus, bow] 1. Pertaining to being shapedlike an arc; arch-like. 2. (MOLL: Bivalvia) Referring to theventral edge in some pelecypods. 3. (PORIF) Referring tothe chelate microsclere in the form of one to three curvedplates; commonly three plates.arcuate vein (ARTHRO: Insecta) The first jugal vein.arculus n. [L. dim. arcus, bow] (ARTHRO: Insecta) A basalcross vein between the radius and the cubitus.are n. [L. area, open place] A metric area measurement of asquare, with each side 10 meters in length.area n. [L. area, open place] (BRYO: Gymnolaemata) In anascans,the space occupied by the frontal membrane.arenaceous a. [L. arena, sand; -aceus, having the nature of]Sandy, or the nature of sand.arenicolous a. [L. arena, sand; colere, to inhabit] Burrowing inor inhabiting sand. see psammophilous.areocel see accessary cellareola, areole n.; pl. -lae, -las (areoles) [L. dim. area, smallopen place] 1. (ARTHRO: Crustacea) In crayfish, the longitudinalstrip between the brachiocardiac grooves and posteriorto the cervical groove on the dorsum. 2. (ARTHRO:Insecta) a. An accessory wing cell of Lepidoptera. seebasal cell. b. In ichneumonid Hymenoptera, the pentagonalor hexagonal area on the propodeum enclosed by carinae.3. (BRYO: Gymnolaemata) In cheilostomes, a smallopening in the frontal wall connecting the endocyst with theectocyst. 4. (ECHINOD) see scrobicula. 5. (NEMATA) A smallarea within longitudinal striae delimited by transverse annuli.6. (NEMATOM) Round or polygonal cuticular plates,