Ventral process see sternal coxal process

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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