Aglossa see Bivalvia

aglossate n. [Gr. a, without; glossa, tongue] Lacking a tongue.

agminate a. [L. agminis, crowd] Grouped together; aggregated. see cluster.

agnathous a. [Gr. a, without; gnathos, jaw] Lacking a jaw.

agnotobiotic culture Any population with one or more kinds of organisms present. see gnotobiotic culture.

agonist n. [Gr. agonistes, contestant] A primary muscle responsible for the movement of a part or appendage.

agonistic a. [Gr. agonistes, contestant] Behavior signaling aggressive attitude.

agriotype n. [Gr. agrios, wild; typos, type] Ancestral type.

agriotypiform a. [Gr. agrios, wild; typos, type; L. forma, shape] (ARTHRO: Insecta) In Hymenoptera, referring to the peculiar form of larval Agriotypidae, with the first instar having a heavily sclerotized, mandibulate head, rows of spiniform setae on the succeeding segments, and a slender, bifurcate caudal appendage.

ahermatype corals (CNID) Non-reef building species of corals. ahermatic a. see hermatype corals.

aileron n. [F. dim. aile, wing] (ARTHRO: Insecta) A large scale or structure in front of the base of the fore wing; sometimes used as synonymous with alula.

air chamber (MOLL: Cephalopoda) The gas-filled cavity of a nautilus shell that was previously occupied by that organism.

air sacs 1. (ARTHRO: Insecta) Pouch-like enlargements of tracheal tubes in winged forms, usually lacking taenidia, capable of inflation and thought to function as an aid in flight and to lessen specific gravity. 2. (CNID: Hydrozoa) In Si-phonophora, that portion of a pneumatophore that contains gas.

air stores (ARTHRO: Insecta) The covering of bubbles of air carried by hydrofuge structures of certain aquatic forms.

air tube A respiratory tube or siphon.

aitiogenic a. [Gr. aitios, causing; gennaein, to produce] Referring to the resultant reaction from stimulation.

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