ventral prolegs (ARTHRO: Insecta) Prolegs occurring ventrally on the abdominal segments of larvae, except the last segment that are called anal prolegs.
ventral scale (ARTHRO: Insecta) In Diaspinae, the ventral part of the scale, composed of a thin layer of wax and the ventral exuviae that are interposed between the insect and the plant.
ventral setae (ARTHRO: Insecta) In Culicidae, four small peglike cibarial setae located at the posterior margin of the cibarium.
ventral sinus (ARTHRO: Insecta) The space of the body cavity below the ventral diaphragm, containing the nerve cord; the perineural sinus.
ventral stylet (ARTHRO: Insecta) In Siphunculata, the lower of 3 stylets (labium), toothed at the base for piercing.
ventral sympathetic nervous system (ARTHRO: Insecta) A pair of transverse nerves associated with the ganglia of the ventral nerve cord in each segment, passing to the spiracles of their segment; may be connected to the perisym-pathetic system.
ventral thickening (ARTHRO: Insecta) In soft scales, two sclerotic, dorsal, internal processes that support the anal plates.
ventral tube (ARTHRO: Insecta) In all Collembola, a basal column containing a pair of protrusible vesicles (shallow sacs or long and tubular), on the ventral aspect of the first segment; functioning in respiration, water absorption and/or adhesive organ for mobility over smooth or steep surfaces. see ventral groove.
ventral vessel (ANN: Oligochaeta) A major blood vessel found in the mesentery ventral to the alimentary canal.
ventricle n. [L. dim. venter, belly] A cavity or chamber of an organ, especially of the heart; receives blood from the auricles. see heart chamber.
ventricose a. [L. dim. venter, belly] 1. Distended, inflated toward the middle. 2. (MOLL: Gastropoda) In Harpidae, having the whorls or valves swollen or strongly convex; inflated in the middle or on one side.
ventricular valve 1. (ARTHRO: Insecta) see auricular valve.
2. (nemata) A valve between the esophagus and the mes-enteron proper; esophagointestinal valve.
ventriculus n. [L. dim. venter, belly] (NEMATA) Anterior part of the intestine if cellularly different from the rest of the intestine; sometimes corrupted to mean glandular portion of the esophagus. ventricular a. see ventricular valve.
ventrite n. [L. venter, belly] A ventral segment; ventral aspect of annular rings.
ventrodorsal a. [L. venter, belly; dorsum, back] Extending from ventral to dorsal.
ventrolateral a. [L. venter, belly; latus, side] Of or pertaining to the area ventrally and to the side.
ventromedially adv. [L. venter, belly; medius, median] Of or pertaining to the median ventral line.
venulose a. [L. dim. vena, vein] Having many small veins.
verge n. [F. verge, rod] (MOLL: Gastropoda) In Prosobranchia, the penis.
Vermes n. [L. vermis, worm] An obsolete term for animals that included all worm-like phyla.
vermicide n. [L. vermis, worm; caedere, to kill] Any of various therapeutic agents producing the death of a helminth; anthelmintic. see vermifuge.
vermiculate a. [L. dim. of vermis, worm] Resembling a worm, or having tracery simulating the tracks of a worm. ver-miculation n.
vermiform a. [L. vermis, worm; forma, shape] Worm-shaped.
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