rheogameon n. [Gr. rheein, to flow; gamos, marriage; on, being] Rassenkreis; polytypic species.
rheophile a. [Gr. rheein, to flow; philos, loving] Living in rivers and streams; reophilic. rheophily n.
rheoreceptor n. [Gr. rheein, to flow; L. recipere, to receive] A sensory structure that signals the presence or strength of water currents.
rheotaxis n.; pl. -taxes [Gr. rheein, to flow; taxis, arrangement] Tactic response due to stimulation from moving fluid; rheotropism. a. Positive rheotaxis: migrating against the current of moving fluid. b. Negative rheotaxis: Moving with the fluid. reotactic a.
rhinarium n.; pl. -ia [Gr. rhinos, nose; -arium, place] (AR-THRO: Insecta) In Hemiptera, usually round or oval, sometimes transversely elongate secondary sense organs on antennae of Aphididae.
rhinophores n.pl. [Gr. rhinos, nose; phorein, to bear] (MOLL: Gastropoda) 1. In Opisthobranchia, the second pair of modified tentacles commonly surrounded at the base by a collarlike fold, located behind the first pair; chemoreceptors at base of the tentacles. 2. In Nautiloidea, a digitiform chemoreceptor present beneath each eye.
rhipidoglossate a. [Gr. rhipis, fan; glossa, tongue] (MOLL: Gastropoda) Having a radula with each transverse row furnished with numerous long, narrow, hooked marginal teeth arranged in a fan-like manner and usually five similar ad-medians on either side.
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