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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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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 747ered ancestral.prototergite n. [Gr. protos, first; L. tergum, back] (ARTHRO:Insecta) The anterior dorsal segment <strong>of</strong> the abdomen.prototheca n. [Gr. protos, first; theke, case] (CNID: Hydrozoa)In corals, the surrounding walls <strong>of</strong> the calyx.prototrichy n. [Gr. protos, first; thrix, hair] Chaetotaxy inwhich certain areas have only idionymous ancestral setae.prototroch n. [Gr. protos, first; trochos, wheel] The preoralgirdle <strong>of</strong> cilia (first girdle) characteristic <strong>of</strong> a trochophorelarva.prototrochophore larva A young trochophore larva with anapical organ, prototrochal girdle and a digestive tract withmouth and anus.prototrochula larva (PLATY: Turbellaria) A free swimminglarva <strong>of</strong> some Polycladida supposed to be a precursor <strong>of</strong> thetrochophore larva <strong>of</strong> other animals.prototype n. [Gr. protos, first; typos, type] The original typespecies; the primitive or ancestral form.protozoea n. [Gr. protos, first; zoe, life] (ARTHRO: Crustacea)The postnaupliar substages in which the antennae andsome <strong>of</strong> the thoracic exopods are natatory. see zoea.protract v.t. [L. pro, before; tractus, a space drawn out] Toextend forward or outward; to protrude.protractive see prosoclineprotractor muscles 1. A contractile muscle that functions toextend an organ. 2. (NEMATA) Muscles attached to thestylet knobs or base and anteriorly to the body wall or headskeleton. 3. (SIPUN) In adult Xenosiphon and some larvalforms, an extra pair <strong>of</strong> muscles attached to the introvertnear the brain and to the body wall <strong>of</strong> the trunk anteriorly.protractor preputii see hood protractorprotriaenes n.pl. [L. pro, before; Gr. triaina, trident] (PORIF)Tetraxons, with three clads directed forward making an angle<strong>of</strong> less than 45° with the produced axis <strong>of</strong> the rhabdome.protrusile a. [L. pro, before; trudo, thrust] Capable <strong>of</strong> being

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