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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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828Maggenti and Gardnertwisted.sigmoid a. [Gr. the 16th letter, sigma; eidos, form] Shapedlike the letter S; sigmoidal.sigmoid curve see logistic curvesigna n.pl.; sing. signum [L. signum, sign] (ARTHRO: Insecta)In female Lepidoptera, spines or dentate or roughenedpatches on the inner wall <strong>of</strong> the corpus bursae, thought t<strong>of</strong>unction in holding or breaking up spermatophores.silicalemma n. [L. silex, flint; Gr. lemma, peel] (PORIF) A unitmembrane enclosing the axial filament <strong>of</strong> a siliceous spicule.siliceous, silicious a. [L. silex, flint] Of or pertaining to silica.silicoblasts n.pl. [L. silex, flint; Gr. blastos, bud] (PORIF) A cellthat secretes all or part <strong>of</strong> a siliceous spicule.siliquiform a. [L. siliqua, a pod; forma, shape] Having theshape <strong>of</strong> a silique; long, tubular and narrow like a pod.silk n. [Gr. serikos, silk] 1. A secretion that hardens so rapidlyon extrusion that it may be produced as a long continuousthread. 2. (ARTHRO: Chelicerata) Secreted by specializedsalivary glands in Acari; anterior <strong>of</strong> the abdomen in Araneae;the galea <strong>of</strong> Pseudoscorpionida. 3. (ARTHRO: Insecta)Secreted from dermal openings on the abdomen in someColeoptera; foretarsi in Embioptera and some empididDiptera; malpighian tubes discharging at the anus in Neuroptera,some Coleoptera and Hymenoptera; mouth cavity(usually modified salivary glands) in Psocoptera, Siphonaptera,some Diptera, Trichoptera, Lepidoptera and Hymenoptera.silk glands Glands that secrete the liquids that produce silk onexposure to the air.silk press (ARTHRO: Insecta) In Lepidoptera larvae, a structuresimilar to a typical salivary pump in which the silk ismolded to a thread; silk regulator; thread press.silvicolous a. [L. silva, forest; colere, to dwell] Inhabiting orgrowing in forests or woodlands.simple a. [L. simplex, simple] Without embellishment; notmodified, forked, toothed, branched or divided.

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