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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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792Maggenti and Gardner(ANN: Hirudinoidea) A cavity at the anterior end <strong>of</strong> the digestivetract. 2. (NEMER) A tubular chamber anterior to theproboscis, opening anteriorly by means <strong>of</strong> the proboscispore.rhynchostome n. [Gr. rhynchos, snout; stoma, mouth] (NE-MER) The proboscis pore.rhynchoteuthis stage (MOLL: Cephalopoda) In Ommastrephidae,a juvenile form with tentacles fused into a rostrum ortrunklike proboscis; the tentacles separate later.rhypophagous a. [Gr. rhypos, dirt; phagein, to eat] Eating dirtor filth.rhythm n. [Gr. rhythmos, measured motion] Regular periodicchanges. see circadian, diurnal.rib n. [A.S. ribb, a rib] 1. In Gastropoda and Brachiopodashells, a long and narrow ridge; a costa. 2. (MOLL: Bivalvia)A broad and prominent elevation <strong>of</strong> the shell surface; usuallydirected radially; costa.Ribaga's organ (ARTHRO: Insecta) In some female Hemiptera,pouches on various places <strong>of</strong> the nongenital abdomen;hemocoelic fecundation instead <strong>of</strong> by means <strong>of</strong> the customaryducts; ectospermalege; Berlese's organ. seemesospermalege.ribbon n. [OF. ribon] (MOLL: Gastropoda) A flat spiral surfaceelevation.riblet n. [A.S. dim. ribb, rib] A small or rudimentary rib;costella.rib<strong>of</strong>lavin n. [L. alteration <strong>of</strong> arabinose; flavus, yellow] 6,7-dimethyl-9-D-ribitylisoallozazine, a water-soluble yellowpigment, generally occurring in animal tissues in a form inwhich it is metabolically active.ribonucleic acid (RNA) Long chain polymers <strong>of</strong> ribose andcertain organic bases; differing from DNA in using the baseuracil and usually single stranded.ribose n. [L. alteration <strong>of</strong> arabinose] Pentose sugar which withcertain organic bases makes up RNA and DNA polymers.ribosome n. [L. alteration <strong>of</strong> arabinose; Gr. soma, body] Aggregations<strong>of</strong> RNA and proteins that act in synthesis <strong>of</strong>

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