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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> 255secta) In Lepidoptera and on other insect larvae, one <strong>of</strong> aseries <strong>of</strong> sclerotized hooklike cuticular structures, in rowsor circles on the prolegs; also on cremaster <strong>of</strong> chrysalides;frequently called hooks. 2. (ANN) see crotchet.crook n. [ON. krokr, crook] A hook; recurved tip; bend orcurve.crop n. [A.S. crop, craw] An enlarged portion in the alimentarycanal in certain invertebrates functioning in storage ortransporting and passing on to the digestive tract; theingluvies; esophageal bulb.crop caeca (ANN: Hirudinoidea) Segmental pouches or diverticula<strong>of</strong> the crop.cross n. [OF. crois, cross] An organism produced by two differingforms; hybrid.crossed-lamellar shell (MOLL: Bivalvia) A shell structure withsecondary lamellae inclined in alternate directions withinthe primary lamellae.cross-fertilization The union <strong>of</strong> gametes from different individuals;allogamy; allomixis; xenogamy. see self-fertilization.crossing over The exchange <strong>of</strong> corresponding portions <strong>of</strong> homologouschromosomes during synapsis.cross-reflex The reaction <strong>of</strong> an effector on one side <strong>of</strong> thebody to stimulation <strong>of</strong> a receptor on the opposite side.cross section A cut <strong>of</strong> an organism or structure at right anglesto the longitudinal axis; a transverse cut.cross-striation In striped and cardiac muscle fibers, darkbands running across a fiber perpendicular to the my<strong>of</strong>ibrilsand representing lines <strong>of</strong> A-bands.cross veins Any vein connecting adjacent longitudinal veins.crotchet n. [F. crochet, small hook] 1. A hooked or forklikeprocess. 2. (ANN) A curved seta (chaeta), notched at thedistal ends. 3. (ARTHRO: Insecta) see crochet.crown n. [L. corona, crown] 1. A circular structure at or nearthe summit <strong>of</strong> an organ or part. 2. A corona. 3. (ECHINOD:Crinoidea) The whole crinoid without stem; corona. 4.(NEMATA) see corona radiata.

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