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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> 787cular head and extending to the hypodermis in the region<strong>of</strong> the lateral chords.retroarcuate a. [L. retro, backwards; arcuare, to bow] Curvedbackwards.retrobursal a. [L. retro, backwards; bursa, purse] (PLATY: Turbellaria)In Tricladida, having the bursal stalk short, so thatthe bursa lies behind the penis; retrobursalia. see probursal.retrocerebral endocrine system (ARTHRO: Insecta) Systemcomprised <strong>of</strong> corpora allata, corpora cardiaca and ventralgland.retrocerebral organ (ROTIF) A small glandular organ, attachedto the epidermis above and behind the brain, comprised<strong>of</strong> the retrocerebral sac and the subcerebral glands;function unknown.retrocerebral pore (CHAETO) A pore on the dorsal surface behindthe brain where the rectocerebral organs open.retrocerebral sac 1. (CHAETO) A pair <strong>of</strong> sacs imbedded in theposterior part <strong>of</strong> the cerebral ganglion, separated by amembrane but connected by a nerve proximally, andopening by means <strong>of</strong> the retrocerebral pore. 2. (ROTIF) Aforked duct opening on the apical field, <strong>of</strong>ten on a single orpaired papilla; part <strong>of</strong> the retrocerebral organ.retrocession n. [L. retro, back; cedere, to go] The act <strong>of</strong> retroceding;to move backward.retrocurrent see opisthoclineretr<strong>of</strong>ection see autoinfectionretr<strong>of</strong>lected a. [L. retro, backwards; flectere, to bend] Bendingin different directions; bent or turned backwards.retrogressive development Developmental trend in evolutionresulting in simplification <strong>of</strong> an organism, usually throughthe complete or partial loss <strong>of</strong> one or more structures; regressivedevelopment.retrorse a. [L. retrorsus, turned or bent backwards] Turned,bent, or directed backward; backward projecting. see antrorse,detrorse.retrovesicular ganglion (NEMATA) The largest ganglion, usu-

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