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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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790Maggenti and Gardnerrhegmatocytoid see spherule cellrheogameon n. [Gr. rheein, to flow; gamos, marriage; on,being] Rassenkreis; polytypic species.rheophile a. [Gr. rheein, to flow; philos, loving] Living in riversand streams; reophilic. rheophily n.rheoreceptor n. [Gr. rheein, to flow; L. recipere, to receive] Asensory structure that signals the presence or strength <strong>of</strong>water currents.rheotaxis n.; pl. -taxes [Gr. rheein, to flow; taxis, arrangement]Tactic response due to stimulation from movingfluid; rheotropism. a. Positive rheotaxis: migrating againstthe current <strong>of</strong> moving fluid. b. Negative rheotaxis: Movingwith the fluid. reotactic a.rhinarium n.; pl. -ia [Gr. rhinos, nose; -arium, place] (AR-THRO: Insecta) In Hemiptera, usually round or oval, sometimestransversely elongate secondary sense organs onantennae <strong>of</strong> Aphididae.rhinophores n.pl. [Gr. rhinos, nose; phorein, to bear] (MOLL:Gastropoda) 1. In Opisthobranchia, the second pair <strong>of</strong>modified tentacles commonly surrounded at the base by acollarlike fold, located behind the first pair; chemoreceptorsat base <strong>of</strong> the tentacles. 2. In Nautiloidea, a digitiformchemoreceptor present beneath each eye.rhipidoglossate a. [Gr. rhipis, fan; glossa, tongue] (MOLL:Gastropoda) Having a radula with each transverse row furnishedwith numerous long, narrow, hooked marginal teetharranged in a fan-like manner and usually five similar admedianson either side.rhizocaul, rhizocaulome see hydrocaulusrhizoclad n. [Gr. rhiza, root; klados, branch] (PORIF) A megascleredesma with rootlike processes; rhizoclonerhizoid n. [Gr. rhiza, root; eidos, like] (BRYO) A rootlike structurecomposed <strong>of</strong> one or more kenozooids.rhizoid spines (BRACHIO) Spines that serve to attach the animal,either by entanglement or by cementing themselvesto a foreign surface.rhizome n. [Gr. rhiza, root] (CNID: Hydrozoa) The stolon; the

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