ample a. [L. amplus, large] Large in size, capacity, volume or scope.
amplected a. [L. amplexus, embracing] (ARTHRO: Insecta) Having the head set into a hollow or recess of the prothorax.
amplexiform wing coupling (ARTHRO: Insecta) Lepidopterous wing coupling by virtue of an extensive area of overlap between the fore and hind wing.
ampliate a. [L. ampliatus, made wider] To enlarge; to make greater.
amplification n. [L. amplificare, to enlarge] An enlargement or extension; expanding a statement or description.
anamorphosis n.; pl. -ses [Gr. ana, backwards; morphosis, forming] 1. A process of slow, steady evolution without apparent gross mutant variation. 2. (ARTHRO: Insecta) a. The increase of number of segments after hatching. b. Development in which the young gradually become more like the adult in body form after each ecdysis, as opposed to metamorphosis. anamorphic a. see ametabolous, metamorphosis, epimorphosis.
anandric a. [Gr. an, without; aner, man] (ANN: Oligochaeta) Designating earthworms without testes.
anaphase n. [Gr. ana, up; phasis, appearance] The period of mitotic division in which the daughter chromosomes move toward opposite poles.
anaphylaxis n. [Gr. ana, again; phylax, guard] A state of excessive sensitivity to a serum or foreign protein that can result in a state of shock, that may develop with marked circulatory disturbances and possible death. anaphylactic a.
anaplasis n. [Gr. ana, up; plassein, to form] Progressive ontogenetic development.
anapleurite n. [Gr. ana, up; pleuron, side] (ARTHRO: Insecta) A dorsal sclerite of the thoracic pleural region.
anapolysis n. [Gr. an, without; apo-, separate; lysis, loosen] (PLATY: Cestoda) The detachment of a spent proglottid after it has shed its eggs. anapolytic a. see apolysis.
anapterygote a. [Gr. an, not; a, without; pterygotos, winged] (ARTHRO: Insecta) Designates apterous insects that are derived from winged ancestors.
anaptychus n. [Gr. an, without; apo-, away from; ptychos, fold] (MOLL: Cephalopoda) A shelly plate found in some fos sil cephalopods, thought to function as an operculum. see synaptychus.
anarsenosomphic a. [Gr. an, without; arsen, male; somphos, porous] (ANN: Oligochaeta) Designates earthworms without male terminalia, such as parthenogenetic morphs, cephalic regenerates, or abnormal individuals.
anarthrous a. [Gr. an, without; arthron, joint] Lacking a distinct joint or joints.
anascan n. [Gr. an, without; askos, sac] (BRYO: Gymnolae-mata) Cheilostomata in which the autozooids have a hydrostatic system including the flexible part of the frontal wall, thus lacking an ascus.
anastomosing colony (BRYO) A branching erect colony where branches join and rebranch to form an open network.
anastomosis n.; pl. -ses [Gr. anastomosis, formation of a network] A union or joining between two or more structures forming a network.
anastral a. [Gr. an, without; aster, star] Lacking an aster, with reference to mitosis.
anastrophic a. [Gr. ana, backwards; strephein, to turn] (MOLL: Gastropoda) In Prosobranchia, as in Architectonica , pertaining to a heterostrophic shell with the protoconch coiled about the same axis as the teloconch and the nucleus directed toward the base of the shell.
anatomy n. [Gr. ana, again; temnein, to cut] The science of internal morphology, as revealed by dissection. see zootomy.
anatoxin n. [Gr. ana, backwards; toxikon, poison] A toxin modified by heat or chemical treatment eliminating its toxic properties, but retaining its antigenic properties; toxoid.
anatrepsis n. [Gr. anatrepein, to turn over] 1. Increase of movement during blastokinesis. 2. (ARTHRO: Insecta) In blastokinesis, a term used to describe the movement of the embryo inside the egg from one pole to another; refers to different activities in different groups of insects, i.e., ventral to dorsal, dorsal to ventral. see katatrepsis.
anatriaene n. [Gr. ana, up; triaina, trident] (PORIF) A tetracti-
nal megasclere with three short recurved rays and a single long shaft.
anautogeny a. [Gr. an, without; autos, self; genes, producing] (ARTHRO: Insecta) Refers to the necessity of a blood meal of certain Diptera before eggs can develop within the female. see autogeny.
anaxial a. [Gr. an, without; L. axis, axle] Lacking a distinct axis; asymmetrical.
anaxon, anaxone n. [Gr. an, without; axon, axis] A nerve cell having no apparent axon.
ancestral a. [L. antecedere, to go before] Referring to derivation from an earlier form or ancestor; primitive.
ancestrula n. [L. antecedere, to go before] (BRYO) The first formed colony founding zooid. a. In Stenolaemata and most Gymnolaemata, the zooid formed by metamorphosis of a sexually produced larva. b. In Phylactolaemata, the zooid formed from a statoblast.
anchialine a. [Gr. anchi, near; hals, salt] Pertaining to landlocked pools or cave lakes that have subterranean connections to the ocean.
anchor n. [L. ancora, anchor] 1. (ARTHRO: Crustacea) In Cope-poda, enlarged first thoracic segment of an anchor worm. 2. (ARTHRO: Insecta) In Ephemeroptera, a distal fibrous knob of the egg, terminating an elongate adhesive thread coiled around the base. 3. (echinod: Holothuroidea) An anchor-shaped ossicle or spicule of sea cucumbers. 4. (platy: Cestoda) In Monogenea, large curved hooks on the opisthaptor; hamuli.
anchorate a. [L. anchora, anchor] (PORIF) Pertaining to a chela with four clads at each end.
anchor process (ARTHRO: Insecta) An anterior process of some dipterous larvae; sternal spatula. see breastbone.
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