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Слова на букву terg-x-ch (737)

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n. [Gr. tropos, turn; taxis, arrangement] A type of taxis in which an animal directs itself in relation to a source of stimulation by comparing the amount of stimulation on ...
n. [OF. trompe, trumpet] (ARTHROPODA: Insecta) In Diptera, paired, usually movable respiratory structures, located on the dorsal portion of the cephalothorax of culicid ...
adj. [L. truncus, cut off] Terminating abruptly; ending squarely with a cut-off edge; truncation n.
n. [L. truncus, cut off] 1. (ANNELIDA) a. In Polychaeta, the body between the peristomium and the pygidium. b. In Oligochaeta, the body between the peristomium and ...
n. [Gr. tryein, to rub down; pepsis, digestion] An enzyme that catalyzes the hydrolysis of proteins; tryptic adj..
См. tryptophane.
n. [Gr. tryein, to rub down; phanein, to appear] An amino acid existing in proteins, from which it is set free by tryptic digestion, that gives a red or violet color on ...
n. [L. tubus, tube] Any hollow, cylindrical structure.
tube tracheae
(ARTHROPODA: Chelicerata) In Opiliones, Solifugae and most spiders, tube-like tracheae; usually unbranched ectodermal invaginations; see sieve tracheae.
(ECHINODERMATA) Small, fluid-filled tubes of the water vascular system functioning in locomotion, adhesion, food capture and transport to the mouth; some are sensory and ...
n. [L. dim. tuber, hump] 1. A small knoblike or rounded protuberance; see torus. 2. (ARTHROPODA: Insecta) In Diptera, sometimes used for an elongate facial swelling.
tubercula pubertatis
(ANNELIDA: Oligochaeta) A glandular swelling near the ventrolateral margin of the clitellum of mature adult earthworms during copulatory phase; differs in size, shape and ...
, tuberculose adj..
adj. [L. dim. tuber, hump; fero, bear] Bearing tubercles.
adj. [L. tubus, tube; colere, to dwell] Inhabiting a tube; a tubular spider web.
adj. [L. tubus, tube; facere, to make] Tube constructing.
n. [L. dim. tubus, tube] A minute tube.
n. [L. dim. tubus, tube] (ARTHROPODA: Insecta) In Lepidoptera, a tubular, telescoping ovipositor.
n. [L. tubus, tube] (NEMATA) A cuticular projection surrounding the spicules beyond the body outline; cloacal tubus.
tuft sensilla
(ARTHROPODA: Crustacea) In Decapoda, small branched hairs over pores in the carapace with two or three attached neurons, functioning in vibration and water movement ...
Tullgren funnel
Apparatus designed by adj. H. Tullgren for extraction of animals from duff and litter; the sample is placed on a sieve and heat is applied from above to drive the animals ...
n. [L. tumere, to swell; facere, to make] Abnormal tissue formations in invertebrates having characteristics in common with vertebrate neoplasms, however, precise nature is ...
n. [L. tumescere, to swell up] Slightly tumid or enlarged.
adj. [L. tumere, to swell] Swollen; enlarged; abnormally distended.
n. [L. tumulus, mound] (ARTHROPODA: Insecta) In Apis, a pile of earth at the mouth of an underground burrow.
n. [L. tunica, garment] (TARDIGRADA) A cryptobiotic shriveled, state of tardigrades produced by evaporation of surrounding water film.
n. [L. tunica, garment] A covering membrane or tissue.
n.; pl. -cae [L. tunica, garment] 1. A covering or enveloping membrane or tissue; a tunic. 2. (ARTHROPODA: Insecta) For Lepidoptera see diaphragm.
tunica adventitia
Outermost fibro-elastic layer of various tubular organs, such as vas deferens, esophagus, uterus, ureter, etc.
tunica intima
An inner lining or membrane.
tunica propria
(ARTHROPODA: Insecta) In females, an elastic membrane, with or without fine fibrils, that encloses the ovariole and terminal filament.
adj. [L. tunica, garment] Pertaining to a covering membrane or a tunic.
adj. [L. tunica, garment] 1. Having a tunic. 2. (ARTHROPODA) Applied to coupling joint of antennae.
adj. [L. turbo, a whirl] Top-shaped; nearly conical with a round base; turbiniform.
turbinate eye
(ARTHROPODA: Insecta) In male Baetidae Ephemeroptera, eyes enlarged, divided into lower and outer pigmented ovals and raised on a broad stalk, with larger upper and inner ...
adj. [L. turgidus, swollen] Swollen; distended.
adj. [L. turris, a tower] Tower-shaped.
adj. [L. dim. turris, tower] (MOLLUSCA: Gastropoda) Having an acutely conical spire comprised of numerous flattish whorls; turriform; turrited.
n. [Gr. tyche, change; parthenos, virgin; genesis, beginning] Unfertilized eggs that can occasionally, or accidentally, develop through parthenogenesis.
n. [Gr. tylos, knob; aster, star] (PORIFERA) A starshaped spicule with a small center and knobbed rays.
tylenchoid esophagus
(NEMATODA: Secernentea) An esophagus with a narrow procorpus, a strongly formed median bulb (metacorpus), followed by a narrow typical isthmus and terminating with a ...
n.; pl. tyloides [Gr. tylos, knob] (ARTHROPODA: Insecta) In Trigonalidae and Ichneumonidae, any large indented, flattened or raised sensory area on the antennae.
n.; pl. -es [Gr. tylos, knob] A hardening or thickening; a callous.
adj. [Gr. tylos, knob; stylos, column] (PORIFERA) A monactinal monaxon knobbed at the broad end and pointed at the other; see subtylostyle.
n. [Gr. tylos, knob] (PORIFERA) A diactional monaxon in which both broad ends are knobbed.
n.; pl. tyli [Gr. tylos, knob] (ARTHROPODA: Insecta) The distal part of the clypeal region of the head.
n. [F. timbale, kettledrum] (ARTHROPODA: Insecta) In Hemiptera (Cicadidae), an area of thin cuticle supported by a cuticular rim and a series of dorso-ventral strengthening ...
tympanal air chamber
(ARTHROPODA: Insecta) An air-sac or space, usually posterior to the tympanal organ into which outside air is admitted by a spiracle allowing the tympanum to vibrate freely.
tympanal bullae
see tympanal hood.
tympanal fossa
(ARTHROPODA: Insecta) In Diptera, a largely membranous area between the suprasquamal ridge and the lower margin of the postalar wall.
tympanal frame
(ARTHROPODA: Insecta) The supporting framework of the tympanal membrane.
tympanal hood
(ARTHROPODA: Insecta) In some Lepidoptera, one of a pair of tubercles or rounded prominences on the dorsal surface at the base of the first abdominal segment.
tympanal organs
(ARTHROPODA: Insecta) Specialized chordotonal organs that occur on prothoracic legs, mesothorax, metathorax, or abdomen; the auditory organ or eardrum.
tympanal pockets
(ARTHROPODA: Insecta) In Lepidoptera, pockets in the tympanal frame, usually 4 in number.
tympanal ridge
(ARTHROPODA: Insecta) In some Diptera, a rib-like sclerite forked anteriorly, forming a single or double Y that encloses the tympanic pit.
tympanic pit
(ARTHROPODA: Insecta) In Diptera, a membranous area opening toward the base of the wing, enclosed by the two lowermost arms of the tympanal ridge.
n.; pl. -ana [Gr. tympanon, drum] (ARTHROPODA: Insecta) A vibrating membrane involved in hearing; typanic membrane; an auditory membrane.
Tyndall colors or scattering
(ARTHROPODA: Insecta) Color of certain insects resulting from interference of light reflected by granules cast upon an absorbing layer of dark pigment beneath a more or less ...
n. [Gr. typos, type] A zoological object that serves as the base for the name of a taxon.
type by absolute tautonomy
see type by original designation.
type by elimination
A type designated when some of the original species of a genus have been transferred to other genera, the type of the genus selected from among the original species that ...
type by original designation
A species designated as type in the original publication of a genus. a. If in the original publication of a genus, typicus or typus is used for any of the species. b. The ...
type by virtual tautonomy
An original species of a genus that has a specific or subspecific name, either as a valid name or a synonym, is virtually the same as the generic name, or of the same origin ...
type genus
In families, the specific genus on which the family is founded, not necessarily the first one described.
type host
A designated organism from which a type specimen has been collected.
type locality
The area from which a holotype, lectotype, or neotype was collected.
type method
The method by which the name for a taxon is unquestionably associated with a definite zoological object belong to the taxon.
type species
The species which was used by the author of a genus to designate as type of a nominal genus.
n. [Gr. typhlos, blind; solen, channel] A longitudinal infolding of the dorsal intestinal wall into the intestinal lumen.
n. [Gr. typos, type; logos, discourse] One who disregards variation and who considers the members of a population as replicas of the type.
n. [Gr. typos, type; lysis, loosing] Phylogerontic; stage that precedes extinction of a type organism or group.
n. [Gr. typos, type; stasis, standing] A static phase in evolution.
U-shaped notal ridge
see scutoscutellar suture.
См. uliginous.
adj. [L. uliginosus, swampy] Of or pertaining to mud; swampy.
adj. [L. ultra, beyond; dexter, right] (MOLLUSCA: Gastropoda) Having a shell appearing to be sinistral but soft parts organized dextrally; hyperstrophic.
adj. [L. ultra, beyond; sinister, left] (MOLLUSCA: Gastropoda) Having a shell appearing to be dextral but soft parts organized sinistrally; hyperstrophic.
adj. [L. ultra, beyond; sonus, sound] High frequency sounds inaudible to the human ear.
n. [L. ultra, beyond; struere, to construct] The fine structure of cells seen with an ultramicroscope or an electron microscope.
n. [L. umbella, a sunshade] 1. An arrangement in which a number of processes, nearly equal in length, spread from a common center. 2. (CNIDARIA: Anthozoa) In Umbellulidae, ...
umbilical suture
(MOLLUSCA: Gastropoda) In phaneromphalous type shells, a continuous line separating successive whorls.
n.; pl. -lici [L. umbilicus, navel] 1. A navel, or navel- like depression. 2. (MOLLUSCA: Gastropoda) A cavity formed around the shell axis between the faces of the adaxial ...
n.; pl. umbones, umbos [L. umbo, knob or boss] 1. (ARTHROPODA: Crustacea) a. In Cirripedia, a portion of the plate from which successive growth increments extend. b. In ...
(MOLLUSCAL:Bivalvia) In oysters, the last larval stage.
umbonal angle
(MOLLUSCA: Bivalvia) In pectinoid shells, the angle of divergence of the umbonal folds; in other shells the divergence of the posterodorsal and anterodorsal parts of the ...
umbonal cavity
(MOLLUSCA: Bivalvia) 1. Part of the valve interior which lies within the umbo and under the hinge plate. 2. In oysters, that part of the left valve interior lying in the ...
umbonal depression
(MOLLUSCA: Bivalvia) A depression at the umbo tip.
umbonal fold
(MOLLUSCA: Bivalvia) In pectinoid shells, a ridge originating at the umbo and setting the auricle off from the shell body.
umbonal pole
(MOLLUSCA: Bivalvia) The point of maximum curvature of the longitudinal profile of the dorsal valve.
umbonal reflection
(MOLLUSCA: Bivalvia) The reflection of the dorsal margin of the valves anterior to and usually over the umbos.
umbonal region
(MOLLUSCA: Bivalvia) The region of the umbo.
umbonal spine
(ARTHROPODA: Crustacea) In Conchostraca, a hollow, curved, looped or nodular spinose projection of variable size, sometimes covering the entire umbo.
see umbo.
adj. [L. umbo, knob or boss; forma, shape] 1. Like or shaped like an umbo. 2. (MOLLUSCA: Gastropoda) Having a low blunt or rounded spire, nearly lenticular in shape; ...
adj. [L. umbo, knob or boss; Gr. eidos, like] (BRYOZOA: Gymnolaemata) In cheilostomates, autozooids having frontal shields formed by calcification of the basal side of ...
См. umbraculiferous.
adj. [L. umbraculum, sunshade] Bearing an umbrella-like structure or organ.
n. [L. dim. umbra, shade] 1. Any umbrella-shaped structure. 2. The ectodermal cells located anterior to the preoral band of cilia in the development of a trochophore ...
umbrella organ
see sensillum campaniformium.
adj. [A.S. un-, not; L. arma, arms] Without armature of any kind, i.e., shield, spurs, spines, plates, teeth, etc.
adj. [A.S. un-, not; L. articulare, to divide] Not jointed or segmented.
adj. [L. uncus, hook] Hooked; hamate.
pl. uncus.
adj. [L. uncus, hook; forma, shape] Hook-shaped.
uncinal plate
see radula.
uncinal seta
(ANNELIDA: Polychaeta) Setae modified into hooks, functioning in feeding or gripping.
adj. [L. uncinus, hook] 1. Hooked or barbed at the end; unciniform. 2. (PORIFERA) Pertaining to megascleres, a fusiform oxea with thornlike spines.
uncinate mastax
(ROTIFERA) A mastax with fulcrum and manubria greatly reduced, stout rami, and large subunci; specialized for food laceration.
n.pl; sing. uncinus [L. uncinus, hook] 1. (ANNELIDA: Polychaeta) Deeply embedded seta with only its multidentate head showing above the cuticle. 2. (MOLLUSCA: Gastropoda) ...
n.; pl. unci [L. uncus hook] 1. (ARTHROPODA: Insecta) a. In some larvae, a hooked process on the distal inner margin of the maxillary mala, possibly a reminant of the ...
adj. [L. unda, wave] Wavy, undulating.
n. [A.S. under, below; bricg, bridge] (NEMATODA: Secernentea) In Heterodera cysts, a structure extending across the vulval cone below and parallel to the vulval bridge.
adj. [A.S. un-, not; L. differens, dissimiler] 1. Immature or embryonic form; unspecialized; capable of differentiation into more specialized form. 2. With cells, meaning ...
adj. [L. unda, wave] Undulating; nearly parallel depressions blending more or less into each other.
adj. [L. unda, wave] Having a wavy surface or margin.
adj. [L. unguis, claw] Pertaining to the ungues or claws.
n.; pl. unguiculi [L. dim. unguis, claw] 1. A small terminal claw or nail-like process. 2. (ARTHROPODA: Insecta) The smaller of the toothed tarsal claws of Collembola; ...
n. [L. unguis, claw; ferre, to bear] (ARTHROPODA: Insecta) A median process of the last tarsomere, articulating with the pretarsal claws.
adj. [L. unguis, claw; ferre, to bear] (PORIFERA) Pertaining to a type of chelate microsclere with short and discrete teeth, often more than three at each end of the ...
n. [L. unguis, claw; flectere, to bend] (ARTHROPODA: Insecta) Muscles responsible for moving or extending the ungues.
adj. [L. unguis, claw; forma, shape] Shaped like a claw.
n.; pl. ungues [L. unguis, claw] (ARTHROPODA) 1. The lateral claw of the pretarsus of several groups. 2. The larger of the toothed tarsal claws of Collembola; ungual a; ...
n. [L. unguis, claw; tract, to pull] (ARTHROPODA: Insecta) A ventral sclerotized plate of the pretarsus from which arises the retractor muscles of the ungues or claws; ...
unguitractor tendon
(ARTHROPODA: Insecta) The tendon serving for attachment of the unguitractor to the pretarsal depressor muscle; apodeme.
see unguis.
adj. [L. unus, one; auricula, outer ear] Having a single ear-like process.
adj. [L. unus, one; branchia, gill] Having one gill.
adj. [L. unus, one; camera, chamber] Having one chamber.
adj. [L. unus, one; capsula, little box] Having only a single capsule.
adj. [L. unus, one; carina, keel] Having a single ridge or keel.
adj. [L. unus, one; cellula, small chamber] Consisting of only one cell.
adj. [L. unus, one; cilium, eyelash] Having a single cilium or flagellum.
adj. [L. unus, one; colere, to dwell] (ARTHROPODA: Insecta) A population of social insects not recognizing nest boundaries; multicolonial.
adj. [L. unus, one; color, tint] Having one color throughout.
adj. [L. unus, one; cornu, horn] Having only one horn.
adj. [L. unus, one; cuspis, point of spear] Having a single tapering point; one tooth.
adj. [L. unus, one; dens, tooth] Having only one tooth.
adj. [L. unus, one; diverticulum, bypath] Having one diverticulum.
adj. [L. unus, one; flagellum, whip] With one flagellum; monociliated.
adj. [L. unus, one; folliculus, small bag] Having one follicle.
adj. [L. unus, one; geminus, twin-born] 1. With one pair. 2. (ECHINODERMATA: Echinoidea) Pertaining to one row of pore pairs.
adj. [L. unus, one; labium, lip] Having one lip.
unilaminate colony
(BRYOZOA) A colony consisting of a single layer of zooids opening in approximately the same direction.
adj. [L. unus, one; latus, side] On one side only.
adj. [L. unus, one; loculus, small place] Having one cell or cavity.
adj. [L. unus, one; loculus, small place] (ANNELIDA) Having only one seminal chamber, such as the spermathecal diverticulum.
adj. [L. unus, one; mucro, sharp point] Having a single sharp tip.
adj. [L. unus, one; nomen, name] Having only one name; monominal.
uninominal nomenclature
The designation of a taxon above species rank by a scientific name consisting of a single word.
uniordinal crochets
(ARTHROPODA: Insecta) In larvae, crochets arranged in a single row of uniform length or somewhat shorter towards the ends of the row; see ordinal.
adj. [L. unus, one; parere, to beget] Producing one egg or young at a time.
adj. [L. unus, one; plicare, to fold] Having a single fold or line of folding.
adj. [L. unus, one; polus, pole] Having one pole only.
unipolar cell
A nerve cell with one fiber issuing from it.
adj. [L. unus, one; radius, wheel spoke] One-rayed.
adj. [L. unus, one; ramus, branch] Having one branch only.
uniramous appendage
(ARTHROPODA) An unbranched appendage.
uniramous parapodium
(ANNELIDA: Polychaeta) A parapodium that has only one part.
adj. [L. unus, one; septum, partition] Having one partition.
adj. [L. unus, one; series, row] Arranged in one row or serial.
uniserial circle
(ARTHROPODA: Insecta) Referring to crochets of larvae arranged in a single row or series with bases in a continuous line; see serial crochets.
adj. [L. unus, one; serra, saw] One row of serrations.
adj. [L. unus, one; sexus, male or female sex] Individuals having separate sexes (dioecious, gonochoric) and producing only one kind (male or female) of gamates, therefore, ...
adj. [L. unus, one; spira, coil] A single turn of a spiral.
unit character
A trait behaving as a unit in heredity, inheritable independently of other traits.
adj. [L. unus, one; valens, strong] One member of a pair of homologous chromosomes.
adj. [L. unus, one; valva, leaf of a folding door] (MOLLUSCA: Bivalvia) Having a shell composed of one piece.
univariate analysis
A biometric analysis of one character.
adj. [L. unus, one; It. volta, time] Having one generation a year; monovoltine.
unjointed seta
(ANNELIDA: Polychaeta) A seta without a joint; a simple seta.
adj. [A.S. un, not; Gr. myelos, marrow] Nerves not covered with a myelin sheath.
adj. [A.S. un, not; L. species, a particular kind] Lacking modifications for any special function or purpose.
unsuitable host
An immune or resistant animal or plant.
upcurved growth line
(ARTHROPODA: Crustacea) In Conchostraca, an upwardly bent growth line covering a tear in the shell margin at the site of an injury.
upper latus
(ARTHROPODA: Crustacea) In Lepadomorph barnacles, the plate in the upper whorl between the scutum and tergum or carina.
upper lip
see labrum.
see furca.
see pterine.
adj. [Gr. ouron, urine] A salt of uric acid.
urate cells
(ARTHROPODA: Insecta) Special cells of the fat-body or in the epidermis or elsewhere that segregate the uric acid, when not excreted through the Malpighian tubules.
n. [L. dim. urceus, pitcher] A pitcher- or urn-shaped structure.
n. [Gr. ouron, urine] A simple organic compound, CO(NH 2 ) 2 , a major nitrogenous waste product.
n. [Gr. ureter] 1. (ARTHROPODA: Insecta) A discharging duct of aggregate Malphigian tubules. 2. (MOLLUSCA: Gastropoda) A duct connecting the kidney with the mantle cavity. ...
uric acid
A nitrogenous waste product, more complex and usually formed in smaller amounts than urea.
adj. [Gr. ouron, urine; telos, end] The excretion of nitrogen as uric acid.
urinary vessels
see Malphigian tubules.
n. [L. urina, urine] A solution of various waste products.
see cirrus.
urn bodies
1. (MESOZOA: Rhombozoa) An urn-like sac on the ventral surface of infusoriform larvae of a dicyemid that contains four germinal cells. 2. (SIPUNCULA) Vase-shaped, ...
urocardiac ossicle
(ARTHROPODA: Crustacea) In a decapodan gastric mill, a T-shaped plate running backwards and downwards, sometimes bearing a U- or V-shaped median tooth.
urogastric groove
(ARTHROPODA: Crustacea) A short transverse groove in the median or submedian region of a decapod carapace posterior to the postcervical groove, sometimes joining the upper ...
urogastric lobe or area
(ARTHROPODA: Crustacea) In Decapoda, a posterior division of the gastric region of a brachyuran carapace; genital region.
adj. [L. urina, urine; gignere, to beget] Of or pertaining to the urinary and genital system.
urogenital opening
(MOLLUSCA: Bivalvia) Opening through which the gonadal products and excretory products are released into the cloacal passage of the exhalant mantle chamber.
n. pl.; sing. urogomphus [Gr. oura, tail; gomphos, club] (ARTHROPODA: Insecta) In Coleoptera larvae, a pair of outgrowths of the tergum of segment 9 in the form of short ...
n. [Gr. oura, tail; meros, part] (ARTHROPODA) An abdominal segment.
n.; pl. uropatagia [Gr. oura, tail; patagium, border] (ARTHROPODA: Insecta) One of the paraprocts located on either side of the anus.
n. [Gr. oura, tail; pous, foot] (ARTHROPODA: Crustacea) 1. In Malacostraca, an appendage of the 6th abdominal somite, fanlike or reduced or modified. 2. In Amphipoda, the ...
uropolar cells
(MESOZOA: Rhombozoa) In Dicyemida, somatoderm cells at the posterior end of the trunk.
n. [Gr. ouron, urine; poros, passage] (ARTHROPODA: Chelicerata) In Prostigmata and Tarsonemida, an external opening of the excretory duct in groups that have an incomplete ...
n. [Gr. oura, tail; soma, body] 1. (ARTHROPODA) The abdomen. 2. (ARTHROPODA: Crustacea) That part of the body posterior to the major articulation, usually including last ...
См. urosoma.
n. [Gr. oura, tail; sternon, chest] (ARTHROPODA) The sternal or ventral part of the uromeres.
n. [Gr. oura, tail; L. tergum, back] (ARTHROPODA) An abdominal tergite.
n. pl.; sing. urstigma [Ger. ur, primitive; Gr. stigma, mark] (ARTHROPODA: Chelicerata) In Acari, sense organs between the coxae of the first and second pairs of legs; ...
v. [L. urtica, nettle] To sting or burn. urtication n; see nematocyst.
urticating hairs
(ARTHROPODA: Insecta) In some caterpillars and adults, bristles with minute lateral points producing marked irritation upon contact, whether due to mechanical action alone or ...
n. [L. uritica, nettle] (CNIDARIA) Cnidocytes; a nettle or sting cell.
see prohemocyte.
adj. [L. ustulatus, scorch or burn] Having the appearance of being scorched or burned; brownish.
uterine bell
(ACANTHOCEPHALA) A bell-like or tubular structure of some females, that moves eggs from the pseudocoel to the uterus.
uterine vagina
see vagina uterina.
n. [L. uterus, womb] An enlargement of the lower end of the oviduct, in which eggs are retained temporarily or in which the embryo develops; uterine adj..
n. [L. dim. uter, bag] A small bag or bladder.
n. [L. dim. uter, bag] (ARTHROPODA: Insecta) In Lepidoptera, the larger lobe of the spermatheca; may be fused into one organ; see lagena.
n. [L. dim. uva, grape] (NEMATODA: Adenophorea) The glandular region where the efferent tubes of the Demanian vessels meet before passing on to one or more exit pores in ...
n. [L. vacuus, empty] A minute cavity within a cell, usually filled with a liquid product of protoplasmic activity. vacuolar adj..
adj. [L. vagus, wandering] Freely wandering; motile.
n; see sessile.
n. [L. vagina, sheath] The terminal portion of the female reproductive tract, that opens to the outside; vaginal adj..
vagina uterina
(NEMATA) An inward extension of the vagina, uniting with the distal part of the uterus, that histologically resembles the vagina, but lacks cuticular lining.
vagina vera
(NEMATA) The outermost part of the vagina, lined with cuticle.
adj. [L. vagina, sheath] Enclosed by a sheath.
adj. [L. vagina, sheath; penna, wing] (ARTHROPODA: Insecta) To ensheath a wing; having wings covered with a hard sheath.
n. [L. dim. vagina, sheath] (ARTHROPODA: Insecta) The covering of the terebra.
see stomogastric nervous system.
n. [L. valentia, strength] Power; important; value.
valid name
An available name for a taxon that is not preoccupied by a valid senior synonym or homonym.
n.; pl. valvae [L. valva, leaf of a folding door] (ARTHROPODA: Insecta) In Lepidoptera, a valve in the external male genitalia; the coxite and the stylus; see harpagones. ...
adj. [L. valva, leaf of a folding door] 1. Furnished with valves. 2. Hinged only at the margin. 3. Of or pertaining to a valve.
n. [L. valva, leaf of a folding door] 1. Any structure that limits or closes an opening. 2. One of the discrete shells or plates of a mollusk, brachiopod or crustacean. 3. ...
valve coverage
(MOLLUSCA: Polyplacophora) 1. Complete coverage Two contiguous valves with the rear edge of one covering the whole front edge of the one posterior to it. 2. Partial ...
n. [L. dim. valva, leaf of a folding door] A small valve or fold.
n. pl. [L. valva, leaf of a folding door; ferre, to bear] (ARTHROPODA: Insecta) The basal plates of the ovipositor, derived from the basal segment of the gonopods; also ...
n.; pl. valvulae [L. dim. valva, leaf of a folding door] 1. Any small valve-like process. 2. (ARTHROPODA: Insecta) In Hymenoptera, processes from the valvifers forming the ...
adj. [L. dim. valva, leaf of a folding door] Of or pertaining to a small valve or valvula.
vannal fold
(ARTHROPODA: Insecta) A radial line of folding of a wing, commonly between the cubital field and the first vannal vein; sometimes variable.
vannal lobe
(ARTHROPODA: Insecta) A lobe in the anal area of a wing, immediately distad of the jugal lobe (when present).
vannal region
(ARTHROPODA: Insecta) That part of the wing comprising the vannal veins, or veins directly associated with the third axillary; vannus.
vannal veins
(ARTHROPODA: Insecta) The veins of a wing in the vannal region, with basal association with the third axillary sclerite.
see vannal region.
n. [L. variare, to change] A sampling statistic relating to deviations from the mean.
n. [L. variare, to change] A variable quantity or character.
n. [L. variare, to change] Differences resulting from nongenetic responses of the phenotype to immediate environmental conditions; ecophenotype.
adj. [L. varix, dilation] Having small or indistinct varices.
pl. of varix.
adj. [L. varix, dilation] Bearing a varix or varices.
adj. [L. variegatus, of different sorts] Marked by different shades or colors.
n. [L. variare, to change] An ambiguous taxonomic term for a heterogeneous group of phenomena including nongenetic variations of the phenotype, morphs, domestic breeds, and ...
n. [F. variole, smallpox] A pock-like mark; fovea; fossa; variolate adj..
n.; pl. varices [L. varix, dilation] (MOLLUSCA: Gastropoda) Transverse elevations that occur on the outer shell surface; more prominent than the costa and generally spaced ...
n.; pl. vasa [L. vas, vessel] A small tubular vessel, duct or canal, especially leading from the testis.
vas deferens
sing.; pl. vasa deferentia. 1. A sperm duct leading away from a testis. 2. (ANNELIDA: Oligochaeta) A duct carrying sperm from the male funnel to the male pore.
vas efferens
sing.; pl. vasa efferentia Tubule leading from the testis to the vas deferens.
n. pl.; sing. -um [L. dim. vas, vessel] (BRACHIOPODA) Branches of the mantle canal system.
adj. [L. dim. vas, vessel] Pertaining to vessels adapted for transmission or circulation of fluids.
vascular markings
(BRACHIOPODA) Impressions of the mantle canals on the inside of the shell; pallial markings.
adj. [L. vas, vessel; forma, shape] Vessel-shaped.
n. [L. vehere, to carry] 1. Any carrier, particularly an animal that transmits a disease organism from one host to another. 2. In helminthic disease, an intermediate ...
vegetal pole
In an early embryo, a region with large cells with much yolk; portion of egg or zygote with more yolk than opposite end.
vegetative functions
All natural functions of living organisms that maintain life.
vegetative reproduction
The development of a new individual from a group of cells in the absence of any sexual process.
n. pl. [L. dim. vena, vein] Small veins.

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