archoophorans n.pl. [Gr. arche, beginning; pherein, to carry] (PLATY: Turbellaria) 1. Individuals with modified cleavage in which yolk is stored in the oocytes; entolecithal eggs. see neophorans. 2. Archoophora A former division of the Tubellaria; a superorder.
arciform a. [L. arcus, bow; forma, shape] Being arcuate; shaped like a bow or arch.
arctic a. [Gr. arktos, bear] 1. Pertaining to the region of the North Pole within the Arctic Circle. 2. Pertaining to the high latitude regions, that may or may not be inside the geographical Arctic Circle, from which tree growth is normally absent, but with plants and animals.
arcticoid teeth (MOLL: Bivalvia) Heterodont teeth intermediate between corbiculoid and lucinoid types.
arctogaea n. [Gr. arktos, bear; gaia, the earth] One of the primary zoogeographic zones comprising North America (except Central America), Europe, Asia and Africa.
arcuate a. [L. dim. arcus, bow] 1. Pertaining to being shaped like an arc; arch-like. 2. (MOLL: Bivalvia) Referring to the ventral edge in some pelecypods. 3. (PORIF) Referring to the chelate microsclere in the form of one to three curved plates; commonly three plates.
arcuate vein (ARTHRO: Insecta) The first jugal vein.
arculus n. [L. dim. arcus, bow] (ARTHRO: Insecta) A basal cross vein between the radius and the cubitus.
are n. [L. area, open place] A metric area measurement of a square, 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 in or inhabiting sand. see psammophilous.
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