apotypic a. [Gr. apo, away; typos, type] Varying from a type.
apparatus n.; pl. -ratus, -ratuses [L. apparatus, equipment] Any group of structures or parts that unite together in a common function.
apparition n. [L. appareo, manifest] Something appearing.
appeasement behavior That which follows after the attack of one animal on another of the same species with the loser assuming a submissive attitude.
appeasement substance The secretion by a social parasite of attractive substances that reduce aggression in a host insect and aid the parasite's acceptance by the host colony.
appendage n. [L. ad, to; pendere, to hang] A structure attached or appended to a larger structure, as parts or organs that are attached to the body of various invertebrates.
appendicle n. [L. ad, to; pendere, to hang] A small appendage or appendix. appendicular a.
appendiculate a. [L. ad, to; pendere, to hang] Bearing or forming small appendages.
appendiculate cell (ARTHRO: Insecta) In Hymenoptera, a small cell just beyond the apex of the marginal cell of the wing.
appendicule n. [L. ad, to; pendere, to hang] (NEMATA) A large, single, ventral, extensible preanal supplementary male organ.
appendiculum n. [L. appendicula, small appendage] (CNID: Scyphozoa) The remainder of the partial veil on the pileus rim of jellyfish.
appendifer n. [L. ad, to; pendere, to hang; ferre, to carry] (ARTHRO: Trilobita) A ventral projection for the attachment of thoracic muscles.
appendix n.; pl. -dixes, -dices [L. ad, to; pendere, to hang] Any supplementary or additional piece or part appended to a regular structure.
appendix interna (ARTHRO: Crustacea) In Malacostraca, the median process of the pleopodal endopod uniting members of each pair; stylamblys.
appendix masculina (ARTHRO: Crustacea) In Isopoda, the modified second (sometimes first also) pleopod(s) in the form of a long, often grooved, rodlike organ that functions as a copulatory organ or gonopod.
appendotomy n. [L. appendix, appendage; Gr. tome, a cutting] The loss of appendages. see autospasy, autotilly, autotomy.
appose v.t. [L. ad, to; ponere, to put] To place opposite or before; to put, apply, or add one thing to another, to place in juxtaposition.
apposition n. [L. ad, to; ponere, to put] 1. Juxtaposition. 2. The growth of a structure by the successive deposition of layers on its outside. see intussusception.
apposition eye (ARTHRO) The compound eye of diurnal insects and crustaceans in which the rhabdom reaches the crystalline cone, it absorbs oblique rays of light in the pigmented walls of the ommatidium and, produces a mosaic image. see superposition eye.
apposition image A mosaic image.
appressed a., adv. [L. ad, to; premere, to press] Pressed or closely applied against something; adherent.
approximate a. [L. ad, to; proximare, to come near] Situated near or close together.
a priori weighting The weighting of taxonomic characters on the basis of preconceived criteria. see a posteriori weighting.
aprostatic a. [L. an, without; pro, before; stare, to stand] (ANN: Oligochaeta) Lacking prostates.
aptera n.pl. [Gr. an, without; pteron, wing] (ARTHRO: Insecta) Insects without wings; formerly an ordinal term including the fleas, lice and other wingless forms.
apterergate n. [Gr. an, without; pteron, wing; ergate, worker] (ARTHRO: Insecta) A wingless worker in vespid wasps, that are normally winged.
apterodicera a. [Gr. an, without; pteron, wing; dikeros, two-horned] (ARTHRO: Insecta) A wingless insect bearing two antennae.
apterogyne n. [Gr. an, without; pteron, wing; gyne, female] (ARTHRO: Insecta) A wingless female social insect that is normally winged.
apterous a. [Gr. an, without; pteron, wing] (ARTHRO: Insecta) Wingless, without wings or winglike expansions; exalate.
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