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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> 741projections <strong>of</strong> the prostomium.prostomium n. [Gr. pro, before; stoma, mouth] 1. The anteriorpreoral unsegmented portion <strong>of</strong> a segmented animal'sbody. 2. An acron. 3. (ANN: Oligochaeta) The anterior protuberanceabove the mouth in the first segment; a preorallobe. prostomial a.protaesthesis n. [Gr. protos, first; aisthesis, sense] A primitivesensilla or sense-bud.protamphibion n. [Gr. protos, first; amphibios, double life](ARTHRO: Insecta) The hypothetical common ancestor <strong>of</strong>Plecoptera, Ephemeridae and Odonata. see protentomon.protandrous hermaphrodite A hermaphrodite that functionsfirst as male and then transforms into female. see protogynoushermaphrodite.protandry n. [Gr. protos, first; aner, male] 1. Maturation <strong>of</strong>the male gonads, then <strong>of</strong> the female organs, within a hermaphroditicindividual. 2. Males appear earlier in the seasonthan females. protandrism n. see protogyny.protaspis larva (ARTHRO: Trilobita) Larval period after emergencefrom the egg, covered by a single, dorsal carapaceand consisting <strong>of</strong> an acron and four postoral segments. seemeraspis larva.protease n. [Gr. proteios, primary; -ase, enzyme] Any proteolyticenzyme.protective coloration/mimicry see cryptic colors, Batesianmimicry, Mullerian mimicry.protective zooid or polyp see dactylozooid, tentaculozooidprotegulal node (BRACHIO) The apical area <strong>of</strong> the adult shell;site <strong>of</strong> protegulum and further growth to brephic stage.protegulum n. [L. pro, before; tegulum, ro<strong>of</strong>] (BRACHIO) Theembryonic shell <strong>of</strong> organic material secreted simultaneouslyby both mantles.proteiform a. [Gr. Proteus, changing god; L. forma, shape]Assuming different forms; variable.proteins n.pl. [Gr. proteion, primary] Complex organic compounds<strong>of</strong> carbon, nitrogen, hydrogen, oxygen and <strong>of</strong>ten

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