Antafossa see antennal fossa

antagonism n. [Gr. antagonistes, competitor] 1. Inhibition or interference in growth of an organism due to unfavorable conditions created by the presence of another species. 2. Opposing action by two different muscles or structures. 3. Neutralizing ability of one drug or hormone upon another; chalone.

antagonistic symbiosis A symbiotic association in which one symbiont seeks to establish domination over the other. see parasitism.

anteal a. [L. ante, before] Being in front or forward.

antealar a. [L. ante, before; ala, wing] (ARTHRO: Insecta) Pertaining to being positioned anterior to the front wing.

antealar sinus (ARTHRO: Insecta) In Odonata, the transverse grooved area in front of the base of the front wings.

anteapical a. [L. ante, before; apex, summit] Proximal of the apex.

anteapical cell (ARTHRO: Insecta) A cell in the distal part of the wing.

anteclypeus n. [L. ante, before; clypeus, shield] (ARTHRO: Insecta) The anterior division of the clypeus when differentiated from the postclypeus by a sulcus or suture. see clypeus.

antecosta n. [L. ante, before; costa, rib] (ARTHRO: Insecta) The anterior marginal or submarginal interior tergal or sternal plate, on which the longitudinal muscles are attached.

antecostal sulcus/suture (ARTHRO: Insecta) The groove of the intersegmental sclerite that marks the base of the antecosta.

antecoxal piece (ARTHRO: Insecta) An inner sclerite between the trochantin and the episternum; the lateral sclerites of the clypeus.

antecoxal sclerite (ARTHRO: Insecta) A part of the metaster-num just anterior to the hind coxae.

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