Слова на букву terg-x-ch (737) Dictionary of invertebrate zoology
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n. pl. [L. vena, vein] 1. Vessels conducting blood toward the heart. 2. (ARTHROPODA: Insecta) The heavily sclerotized portion of wings that usually enclose small central ...
n. [L. velarium, awning] (CNIDARIA) A velum-like structure having canals lined with endoderm; flaps on the edge of the bell.
n. [L. velum, curtain; concha, shell] (MOLLUSCA: Bivalvia) The shell of the veliger larva; prodissoconch.
n. [L. velum, curtain; gerere, to bear] (MOLLUSCA) A larval stage with a ciliated swimming membrane or membranes; a free-swimming young bearing a velum.
n.; pl. vela [L. velum, curtain] 1. A thin membranous covering. 2. (ANNELIDA: Hirudinoidea) A membrane separating the buccal cavity from the cavity of the oral opening. ...
adj. [NL. vellutum, velvet] Clothed with very dense, upright short hairs.
n. [L. vena, vein] The complete system of veins.
n. [L. venenum, poison] The secretion of the accessory venom, or poison gland; venomous adj..
venom apparatus
1. (ARTHROPODA: Insecta) The sting apparatus or accessory glands. 2. (ANNELIDA: Polychaeta) The seta or venomous jaws.
venom gland
1. A gland secreting an irritating or lethal substance. 2. (ARTHROPODA: Chelicerata) In true spiders, a pair of glands situated in the cephalothorax; in others, on the ...
adj. [L. vena, vein] Having veins or lines that branch like veins.
adj. [L. venosus, full of veins] Having numerous veins.
n. [L. findere, to split] The anus.
n. [L. findere, to split] The anus.
n. [L. venter, belly] The ventral side; the entire under surface of an animal.
ventilation tracheae
(ARTHROPODA: Insecta) Tracheae, that are subject to collapse, that respond to varying surrounding pressure; see diffusion tracheae.
adv. [L. venter, belly; -ad, toward] Toward the venter, or underside of the body; see dorsad.
adj. [L. venter, belly] 1. The lower or underside of the body. 2. (MOLLUSCA: Bivalvia) The edge remote from the hinge; opposite the umbones.
ventral brush
(ARTHROPODA: Insecta) In culicid larvae, a linear series of irregularly paired setae, often divided into two groups, posteroventrally on the midline of abdominal segment 10. ...
ventral cardo
(ARTHROPODA: Crustacea) In Ostracoda, that portion of the peniferum that serves as a hinge by which it articulates with the zygum.
ventral cirrus
see neurocirrus.
ventral comb
(ARTHROPODA: Crustacea) In Cephalocarida, a row of setae or bristles on the posteroventral margin of the last abdominal somite.
ventral cup
(ARTHROPODA: Crustacea) An element of the nauplius eye.
ventral diaphragm
(ARTHROPODA: Insecta) A horizontal septum above the nerve cord separating the perineural sinus from the main perivisceral sinus.
ventral frontal organ
(ARTHROPODA: Crustacea) Paired sensory structures associated with the nauplius eye.
ventral gland
see prothoracic gland.
ventral groove
(ARTHROPODA: Insecta) In Collembola, a cuticular channel down the middle ventral line of the body from the labium to the anterior part of the ventral tube; thought to ...
ventral membrane
(ARTHROPODA: Insecta) In Diptera, skin-like tissue connecting the tergites and the sternites along the sides of the abdomen.
ventral muscles
(ARTHROPODA: Insecta) Tergal and sternal longitudinal abdominal muscles running between the intersegmental folds or on the antecostae of successive sterna.
ventral nerve cord
The primary nerve cord of all invertebrates, except those of the Hemichordata and Chordata phyla.
ventral pharyngeal gland
see pharyngeal gland, ventral.
ventral plate
(ARTHROPODA: Insecta) 1. In embryology, a layer of columnar cells of the blastoderm on the ventral side of the egg. 2. In Diptera, the floor of the cibarium.
ventral process
see sternal coxal process.
ventral prolegs
(ARTHROPODA: Insecta) Prolegs occurring ventrally on the abdominal segments of larvae, except the last segment that are called anal prolegs.
ventral scale
(ARTHROPODA: 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 ...
ventral setae
(ARTHROPODA: Insecta) In Culicidae, four small peglike cibarial setae located at the posterior margin of the cibarium.
ventral sinus
(ARTHROPODA: Insecta) The space of the body cavity below the ventral diaphragm, containing the nerve cord; the perineural sinus.
ventral stylet
(ARTHROPODA: Insecta) In Siphunculata, the lower of 3 stylets (labium), toothed at the base for piercing.
ventral sympathetic nervous system
(ARTHROPODA: 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 ...
ventral thickening
(ARTHROPODA: Insecta) In soft scales, two sclerotic, dorsal, internal processes that support the anal plates.
ventral tube
(ARTHROPODA: 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 ...
ventral vessel
(ANNELIDA: Oligochaeta) A major blood vessel found in the mesentery ventral to the alimentary canal.
n. [L. venter, belly] (GNATHOSTOMULIDA) Paired sensory bristles found ventrally on the head of jaw worms.
n. [L. dim. venter, belly] A cavity or chamber of an organ, especially of the heart; receives blood from the auricles; see heart chamber .
adj. [L. dim. venter, belly] 1. Distended, inflated toward the middle. 2. (MOLLUSCA: Gastropoda) In Harpidae, having the whorls or valves swollen or strongly convex; ...
ventricular valve
1. (ARTHROPODA: Insecta) see auricular valve. 2. (NEMATA) A valve between the esophagus and the mesenteron proper; esophagointestinal valve.
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 ...
n. [L. venter, belly] A ventral segment; ventral aspect of annular rings.
adj. [L. venter, belly; dorsum, back] Extending from ventral to dorsal.
adj. [L. venter, belly; latus, side] Of or pertaining to the area ventrally and to the side.
adv. [L. venter, belly; medius, median] Of or pertaining to the median ventral line.
adj. [L. dim. vena, vein] Having many small veins.
n. [F. verge, rod] (MOLLUSCA: Gastropoda) In Prosobranchia, the penis.
n. [L. vermis, worm] An obsolete term for animals that included all worm-like phyla.
adj. [L. vermis, worm] Worm-like.
n. [L. vermis, worm; caedere, to kill] Any of various therapeutic agents producing the death of a helminth; anthelmintic; see vermifuge.
adj. [L. dim. of vermis, worm] Resembling a worm, or having tracery simulating the tracks of a worm. vermiculation n.
adj. [L. vermis, worm; forma, shape] Worm-shaped.
vermiform cells
see plasmatocyte.
vermiform embryos
(MESOZOA: Rhombozoa) In Dicyemida, the young produced within the axial cell of adults.
vermiform larva
(ARTHROPODA: Insecta) A legless worm-like larva, lacking a well developed head; see pronymph.
n. [L. vermis, worm; fugare, to drive away] A therapeutic agent causing expulsion of a helminth, that may or may not cause its death; anthelmintic; see vermicide.
vernacular name
The colloquial designation of a taxon; see scientific name.
adj. [L. vers, spring] Appearing or occurring in spring.
adj. [NL. vernicosus, varnished] Appearing as though varnished or brilliantly polished.
n. [L. verriculum, net] A dense tuft of nearly parallel upright hairs; verriculate adj..
Verrill's organ
see funnel organ.
n.; pl. verrucae [L. verruca, wart] 1. A wart or wartlike prominence. 2. (ARTHROPODA: Chelicerata) In certain Acari, a genital papilla, sternal prominence, or the ...
verruciform cells
(MESOZOA) Somatic cells enlarged by lipoprotein bodies.
adj. [L. verruca, wart] Covered with minute warts or tubercles; see papillate.
adj. [L. versatilis, mobile, changeable] Moving freely.
adj. [L. versicolor, to change color] Having many colors; changeable in color.
Verson's cells
see apical cell.
Verson's glands
(ARTHROPODA: Insecta) In Lepidoptera larvae, large paired, segmental epidermal glands that secrete a " cement layer" over the wax layer; dermal glands.
Versonian glands
see Verson\'s glands.
n.; pl. -ae [L. vertebra, turning joint] (ECHIURANO) 1. In Asteroidea, the fused pair of opposite ambulacrals, articulating with adjacent vertebrae by ball-and-socket ...
n. [L. vertex, top] 1. The top; apex; summit; the highest or principal point. 2. (ARTHROPODA: Crustacea) The top point of the head or cephalon. 3. (ARTHROPODA: Insecta) ...
adj. [L. vertex, top] 1. Of or pertaining to the vertex; highest point. 2. (ARTHROPODA: Insecta) A wing vein when both ends are equally distant from the wing base.
vertical bristles
(ARTHROPODA: Insecta) In Diptera, two pair of bristles, "inner and outer" behind the upper and inner corners of the eyes; vertical cephalic bristles.
vertical classification
Classification focusing on common descent, tending to unite ancestral and descendant groups of a phyletic line into a single higher taxon, thereby separating them from ...
vertical triangle
see ocellar triangle.
adj. [L. verticillus, small whorl] Whorled; provided with whorls of fine hairs; having spines arranged in nodes or whorls.
verticillate antenna
(ARTHROPODA: Insecta) Antenna with whorls of hair at the joints or segments.
n. [L. vertere, to turn] An idionymous organ observed unilaterally among specimens of the same species and stage that has evolutionary significance.
see preputial sac.
adj. [L. vesica, blister, bladder] Blister-like.
См. vesicula.
n. [L. dim. vesica, bladder, blister] 1. A sac, bladder, or cyst, frequently extensible. 2. (ANNELIDA: Oligochaeta) The anteriorly or posteriorly directed pockets of a ...
vesicula seminalis
see seminal vesicle.
adj. [L. dim. vesica, bladder, blister] Containing small cavities or vesicles.
vesicular cell
(BRYOZOA) A cell enclosing a large vesicle; found in peritoneal network and funicular strands.
n. [L. vespa, wasp; -arium, place for] (ARTHROPODA: Insecta) In Hymenoptera, a natural or artificial colonial nest of vespine wasps.
vespid venom gland
(ARTHROPODA: Insecta) In Hymenoptera, a type of venom gland in which two tubes end in a distinct spherically formed reservoir whose wall has a strong muscular layer, but no ...
adj. [L. vespa, wasp; -oid, like] Wasp-like.
n. [L. dim. vas, vase] A tubular structure that conveys fluid.
vestibular organs
(CHAETOGNATHA) A transverse row of papillae, or papillae on a ridge, just behind the teeth.
vestibular pit
(CHAETOGNATHA) A glandular depression behind the vestibular organs.
vestibular wall
(BRYOZOA) The body wall surrounding the vestibule and connecting the tentacle sheath to the wall of the orifice.
См. vestibulum.
n.; pl. -bula [L. vestibulum, entrance hall] 1. A cavity forming an entryway to another cavity or passageway. 2. (ANNELIDA) Containing a penis or male porophore and pore ...
n. [L. vestigium, footprint] A degenerate or imperfect remaining ancestral organ.
adj. [L. vestigium, footprint] Pertaining to a small, degenerate, nonfunctional organ that was ancestrally more fully developed or functional.
n. [L. vestis, garment] The body covering, as scales or hairs.
n.; -illa [L. vexillum, flag] (ARTHROPODA: Insecta) In fossorial Hymenoptera, an expansion on the tip of the tarsi.
adj. [L. vita, life] Capable of living; the ability to grow and develop.
n.; pl. vibracula [L. dim. vibrare, to vibrate] (BRYOZOA: Gymnolaemata) A heterozooid with the operculum in the form of a long bristle or seta between pivots, supposedly ...
n.; pl. -sae [L. vibrissa, whisker] 1. Stiff hairs or bristles. 2. (ARTHROPODA: Insecta) For Diptera, see oral vibrissae.
vibrissal ridge
(ARTHROPODA: Insecta) In Diptera, a ridge arising on each side of the face, inside the arms of the frontal suture; limited distally by the epistoma and the vibrissal ...
n. [L. vibrare, to vibrate; Gr. taxis, arrangement] An organism\'s response to mechanical vibrations.
adj. [L. vicarius, deputy] 1. Taking the place of. 2. Closely related taxa in corresponding but separate environments.
vicarious polymorph
(BRYOZOA: Gymnolaemata) A polymorph in a budding series that communicates with several zooids.
adj. [L. vicinus, neighbor] Neighboring; nearby.
n. [L. vicinus, neighbor] The propensity to variation due to proximity of related organisms.
pl. of villus.
adj. [L. villus, tuft of hair] Covered with villi.
n.; pl. villi [L. villus, tuft of hair] Soft flexible hairs; see microvillus.
n.; pl. -la [L. vinculum, anything used for binding] 1. Anything used to bond structures together. 2. (ARTHROPODA: Insecta) In male Lepidoptera, an U-shaped genital plate, ...
adj. [L. vinum, wine] Wine-colored; vinaceous.
adj. [L. viola, violet] Having a violet hue.
adj. [L. virescere, to grow green] Greenish or turning green.
n. [L. virga, rod] (ARTHROPODA: Insecta) In Dermaptera, a threadlike, sclerotized extension of the ejaculatory duct that guides the passage of the spermatophore into the ...
n.; pl. -lia [L. virga, rod] (ECHINODERMATA: Asteroidea) Ossicles lateral to and symmetrically placed on each side of the ambulacral ossicles.
adj. [L. virga, rod] Rod-shaped.
virgate mastax
(ROTIFERA) With fulcrum and manubrium in the shape of elongate rods; rami are triangular plates.
virgula organ
(PLATYHELMINTHES: Trematoda) Two pyriform sacs fused in the median line with forward pointed ends and placed near the posterior margin of the oral sucker.
virgulate cercaria
(PLATYHELMINTHES: Trematoda) A Xiphidiocercaria group with a ventral sucker smaller than the oral, tail without a fin and a virgula organ near the posterior margin of the ...
adj. [L. viridis, green] Green; greenish; viridescent.
n. [L. virus, poison] The mature virus.
n. [L. virus, poison; Gr. logos, discourse] The study of viruses.
n. [L. virulentus, fr. virus, poison] The state of being pathogenic.
n. [L. virus, poison] An intracellular obligate, infectious parasitic agent visible only under the electron microscope, causing many diseases in man, animals and plants; ...
n. pl. [L. viscera, entrails, flesh inside the body] Internal organs; visceral adj..
visceral ganglion
1. (MOLLUSCA: Bivalvia) Ganglion found near the posterior adductor muscle in the posterior viscera. 2. (MOLLUSCA: Gastropoda) Unpaired, median ganglion lying posteriorly ...
visceral hump or mass
(MOLLUSCA) The main metabolic region of the body; contains the body organs; the visceropallium.
visceral nervous system
see stomogastric nervous system or sympathetic system.
visceral pouch
(MOLLUSCA: Bivalvia) A small extension of the visceral mass on the anterior side of the adductor muscle in oysters.
visceral segments
(ARTHROPODA: Insecta) All abdominal segments anterior to the genital segments; only the anterior visceral segments are variously modified.
visceral sinus
(ARTHROPODA: Insecta) A central cavity between the dorsal and ventral sinuses, containing the main internal organs.
visceral trachea
(ARTHROPODA: Insecta) The median segmental trachea beginning at a spiracle and branching to the alimentary canal, fat tissue, and reproductive organs.
visceral tracheal trunk
(ARTHROPODA: Insecta) A longitudinal trunk associated with the walls of the alimentary canal.
see visceral hump or mass.
adj. [L. viscidus, sticky] Having a thick or sticky consistency; adhesive.
n. [L. viscidus, sticky] The resistance of a fluid to flow due to adherence of particles of one to another; viscous adj..
vital staining
Staining of living cells and tissues by relatively non-toxic dyes; intravital staining; see intra vitam.
vitellaria larva
(ECHINODERMATA: Holothuroidea, Crinoidea, Ophiuroidea) A nonfeeding, barrel-shaped larva possessing ciliated bands with no arms.
n.; pl. -ia [L. vitellus, yolk; -arium, place for] 1. A yolk gland; a zone of growth. 2. (ARTHROPODA: Insecta) That part of an ovariole that contains the developing eggs. ...
adj. [L. vitellus, yolk; gignere, to produce] Producing yolk; sometimes applied to certain cells in the ovaries.
adj. [L. vitellus, yolk] Yellow like the yolk of an egg.
vitelline body
see yolk nucleus.
vitelline duct
(PLATYHELMINTHES: Turbellaria) One of paired ducts connecting the vitelline glands to the common vitelline duct.
vitelline membrane
A membrane enclosing eggs of invertebrates located within an egg shell.
n. [L. vitellus, yolk; Gr. genesis, beginning] The production of yolk.
См. vitellophags.
n. pl. [L. vitellus, yolk; Gr. phagein, to eat] Cells involved with the breakdown of the yolk at all stages of development; vitellophagic adj..
n. [L. vitellus, yolk] The yolk of an egg.
adj. [L. vitrum, glass] Glassy; transparent.
vitreous body
see crystalline cone.
vitreous humor
(MOLLUSCA: Cephalopoda) A jelly-like substance filling the posterior chamber of the eye.
n.; pl. -tae [L. vitta, band] A broad stripe or band; see fascia, frontal vitta; vittate adj..
vitta frontalis
see frontal stripe.
adj. [L. vivere, to live; parere, to beget] Bringing forth living young. viviparity n; see oviparous, ovoviviparous.
adj. [L. volare, to fly] Capable of flying.
adj. [L. volare, to fly] Passing away by evaporation.
n.; pl. -ae [L. volsella, pincers] (ARTHROPODA: Insecta) In Hymenoptera, the inner basal process of the gonocoxite; -voltine suff. [It. volta, time] Used with a prefix to ...
voluntary muscle
Striated muscle capable of rapid contraction and relaxation; found in arthropods and other groups of animals.
n. [L. volvere, to roll] (MOLLUSCA) A whorl or turn of a spiral shell.
n. [L. volvere, to roll] (MOLLUSCA: Gastropoda) A complete coil of a helicocone; see whorl.
see desmoneme.
n. [L. vomer, plowshare] (ARTHROPODA: Insecta) In the infraorder Phasmatidea or suborder Anareolatae, a movable sclerotized process that functions during copulation; vomer ...
n. [L. vulva, womb] The external opening of the female reproductive system.
vulva cone
(NEMATODA: Secernentea) In some Heterodera cysts, the posterior protuberance on the posterior portion.
vulva fenestra
(NEMATODA: Secernentea) In some Heterodera, a thin transparent zone in the body wall of a white female and the cyst wall; encircling or at the sides of the vulva.
vulval bridge
(NEMATODA: Secernentea) In some Heterodera cysts, a narrow connection across the fenestra of the vulval cone, forming two semifenestrae.
vulval flap
См. vulval membrane.
vulval membrane
see epiptygma.
vulvar lamina
(ARTHROPODA: Insecta) In Odonata, a subgenital plate of the 8th abdominal sternite.
Wagener's larva
(MESOZOA: Rhombozoa) In Mycrocymea , a free swimming larval stage that attaches to the host kidney tissue and transforms into a nematogen.
waggle dance
(ARTHROPODA: Insecta) A dance performed by honeybees indicating source and location of a good source.
walking leg
see pereopod.
n. [L. vallus, a palisade] The encumbering sides of an organ or structure.
see homoiothermal.
warning coloration
Conspicuous colors of invertebrates causing predators to ignore them as food, either because they are poisonous or distasteful or because they are mimicking organisms ...
see verruca, tubercle.
water pore
see hydropore.
water vascular system
(ECHINODERMATA) A unique system comprised of tube-like body wall appendages (tube-feet), and a system of canals derived from the coelom.
Waterston's organ
(ARTHROPODA: Insecta) In Hymenoptera Ceraphronidae, a medial patch of reticulum on the 5th gastric tergite; function unknown.
n. [A.S. weax, wax] (ARTHROPODA: Insecta) A substance secreted by various insects consisting of a complex mixture of lipids, varying from species to species.
wax gland
Any gland in various parts of the body that secrete a waxy product in the form of a scale, string or powder.
wax layer
(ARTHROPODA: Insecta) Wax secreted by oenocytes at or near the surface or incorporated into the inner layers of the cuticle; responsible for waterproofing the cuticle.
wax scale
(ARTHROPODA: Insecta) In Apis, thin plates of wax secreted from the intersternal pockets of younger worker bees.
(ARTHROPODA: Insecta) A plate where the secretions of the wax glands are deposited.
n. [A.S. webb] (ARTHROPODA) A network of threads spun by spiders, mites and some insects.
n. [A.S. gewiht, weight] An evaluation of phyletic content of a character and the evaluation of its probable contribution to a sound classification.
Weismann's ring
see ring gland.
wheel organ
(ROTIFERA: Bdelloidea) Ciliated trochal discs, raised on pedestals, functioning in locomotion and in the production of food currents; corona.
white body
see Hensen\'s gland.
white cuticle
(ARTHROPODA: Insecta) The inner thick, tough, laminated endocuticle of an egg membrane secreted by the serosa, and containing chitin; see yellow cuticle.
An intact specimen prepared for examination.
n. [A.S. hweorfan, to turn] (MOLLUSCA: Gastropoda) 1. Any complete coil of a helicocone. 2. The exposed surface of any complete coil of a helicocone.
n. [A.S. wid, broad] (MOLLUSCA) The maximum dimension measured at right angles to the length or height of a shell.
wild type
A strain, organism, or gene of the type predominating in nature; natural.
n. [ME. winge, wing] 1. (ARTHROPODA) One of paired, thin, membranous reticulated organs of flight. 2. (MOLLUSCA) A projection, flattened, expansion, or earlike extension ...
winter egg
Resting egg; where applicable, a type of egg with a thick shell that protects the egg over winter; opsiblastic; see summer egg.
With's organs
(ARTHROPODA: Chelicerata) In Acari, paralabial hypertrophied setae mediad from the rutella.
worker jelly
(ARTHROPODA: Insecta) In Apis, food given to larvae that causes them to become workers; bee milk.
n. pl. [A.S. worc, work] (ARTHROPODA) 1. An individual of the semisocial and eusocial Hymenoptera, nonreproductive, laboring caste. 2. In Isoptera, individuals which lack ...
In most dioecious diploid organisms, sex chromosomes of which there are a pair in the female, but only one in the male.

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