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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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826Maggenti and Gardnernatural phenomena, pathology, or artificial means.sexthecal a. [L. sex, six; Gr. theke, case] (ANN) Having 3 pairs<strong>of</strong> spermathecae.sexual cell see gametessexual dimorphism The notable phenotypic difference betweensexes <strong>of</strong> the same species. see polymorphism.sexuales n.pl. [L. sexus, sex] (ARTHRO: Insecta) In the life-cycle<strong>of</strong> aphids and adelgids, apterous forms produced on theprimary host; the eggs the females lay hatch in the autumn,giving rise to nymphs <strong>of</strong> the apterous fundatrices.sexual hybrid A hybrid in which the DNA is recombined by thefusion <strong>of</strong> haploid nuclei <strong>of</strong> different mating types.sexual pore see gonoporesexual reproduction Reproduction involving the fusion <strong>of</strong> twocells (gamete nuclei), resulting from meiosis.sexual zooid (BRYO) a. In Gymnolaemata, autozooid in whichsex cells develop, may or may not show skeletal modification.b. In Cheilostomata, it may loose the feeding ability.sexupara n.; pl. -ae [L. sexus, sex; parere, to bear] 1. Production<strong>of</strong> male and female <strong>of</strong>fspring by parthenogenesisthen available for sexual reproduction. 2. (ARTHRO: Insecta)The later generation <strong>of</strong> parthenogenetic viviparousAphididae females originating from alienicola.shaft n. [A.S. sceaft, shaft] The cylindrical part <strong>of</strong> a limb orstructure.shagreened a. [Turk. saghri, crupper] Having numeroustooth-like projections.sheath n. [A.S. sceth, shell or pod] A covering enclosing anorganism, part or organ.sheath laminae (BRYO: Stenolaemata) A concentrically enclosedstylet core, continuous with zoarial sheaths, butnormally at right angles to them.sheath <strong>of</strong> penis see ligulashell n. [A.S. scell, shell] A hard, rigid, calcareous or chitinousstructure covering an animal or part <strong>of</strong> an animal.shell fold 1. (ARTHRO: Crustacea) The part <strong>of</strong> the carapace be-

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