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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 55nal megasclere with three short recurved rays and a singlelong shaft.anautogeny a. [Gr. an, without; autos, self; genes, producing](ARTHRO: Insecta) Refers to the necessity <strong>of</strong> a blood meal<strong>of</strong> certain Diptera before eggs can develop within the female.see autogeny.anaxial a. [Gr. an, without; L. axis, axle] Lacking a distinctaxis; asymmetrical.anaxon, anaxone n. [Gr. an, without; axon, axis] A nerve cellhaving no apparent axon.ancestral a. [L. antecedere, to go before] Referring to derivationfrom an earlier form or ancestor; primitive.ancestrula n. [L. antecedere, to go before] (BRYO) The firstformed colony founding zooid. a. In Stenolaemata andmost Gymnolaemata, the zooid formed by metamorphosis<strong>of</strong> a sexually produced larva. b. In Phylactolaemata, thezooid formed from a statoblast.anchialine a. [Gr. anchi, near; hals, salt] Pertaining to landlockedpools or cave lakes that have subterranean connectionsto the ocean.anchor n. [L. ancora, anchor] 1. (ARTHRO: Crustacea) In Copepoda,enlarged first thoracic segment <strong>of</strong> an anchor worm.2. (ARTHRO: Insecta) In Ephemeroptera, a distal fibrousknob <strong>of</strong> the egg, terminating an elongate adhesive threadcoiled around the base. 3. (ECHINOD: Holothuroidea) Ananchor-shaped ossicle or spicule <strong>of</strong> sea cucumbers. 4.(PLATY: Cestoda) In Monogenea, large curved hooks on theopisthaptor; hamuli.anchorate a. [L. anchora, anchor] (PORIF) Pertaining to a chelawith four clads at each end.anchor process (ARTHRO: Insecta) An anterior process <strong>of</strong>some dipterous larvae; sternal spatula. see breastbone.anchylosis see ankylosisanci see ankoancipital a. [L. anceps, double-headed] 1. Having two oppositeedges or angles. 2. (MOLL) A two-edged, double-faced,double-formed shell having two varices that are continu-

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