Слова на букву terg-x-ch (737) Dictionary of invertebrate zoology
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Слова на букву terg-x-ch (737)

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tergopore
n. [L. tergum, back; porus, pore] (BRYOZOA: Stenolaemata) In Tubuliporina, a type of kenozooecium on the back side of a colony, having a polygonal aperture.
tergum
n.; pl. terga [L. tergum, back] (ARTHROPODA) The dorsal surface of any body segment.
termen
n. [L. terminus, boundary] (ARTHROPODA: Insecta) The outer, or distal margin of the wing.
terminal
adj. [L. terminus, boundary, end] At the end; forming the end of a series or part; at the extreme end.
terminal anecdysis
When maximum size is reached, no more ecdyses occur; see anecdysis.
terminal arborizations
Branching fibrils ending the axon and collateral ends; see telodendria.
terminal cirri tetraploid
n. [Gr. tetraple, fourfold; eidos, like] A polyploid with four haploid chromosome sets.
tetrapod
n. [Gr. tetra, four; pous, foot] Having 2 pair of legs; see bipod.
tetrapterous
adj. [Gr. tetra, four; pteron, wing] Having 4 wings.
tetrasomic
adj. [Gr. tetra, four; soma, body] Polysomic cells with one chromosome represented 4 times in a normal diploid; 2n+2.
tetrathyridium
n. [Gr. tetra, four; thyridion, window] (PLATYHELMINTHES: Cestoda) A cysticercoid of Mesocestoides which has a solid body and a scolex not surrounded by special membranes. ...
tetraxon
n. [Gr. tetra, four; axon, axis] (PORIFERA) A spicule of 4 equal and similar rays meeting at equal angles; tetractine; quadriradiate; tetraxonid adj..
thalassophilous
adj. [Gr. thalassa, sea; philos, loving] Inhabiting or dwelling in the sea; pelagic; thalassic.
thallus
n. [Gr. thallos, young shoot] The body or colony of a compound animal.
thamnophilous
adj. [Gr. thamnos, shrub; philos, loving] Inhabiting thickets or dense shrubbery.
thanatocoenosis
n. [Gr. thanatos, death; koinos, common] An assemblage of fossils comprised of the remains of organisms brought together after death; see biocenosis.
thanatosis
n. [Gr. thanatos, death] Feigning death; letisimulation.
theca
n.; pl. thecae [Gr. theke, case] 1. A sheath or sac-like covering or structure for an organ or organisms, as proboscis, tubes, shells, pupa or larvae. 2. (ANNELIDA: ...
thelycum
n. [Gr. thelykos, feminine] (ARTHROPODA: Crustacea) In some female Decapoda, an external pocket on the ventral side of the thorax, functioning as a seminal receptacle.
thelygenous
adj. [Gr. thelys, female; genes, producing] Producing mostly or only female offspring; arrhenogenous.
thelyotoky
n. [Gr. thelys, female; tokos, offspring] A type of parthenogenesis in which unfertilized eggs develop into females; thelytoica; thelyotokous a; see arrenotoky, deuterotoky, ...
theory of probabilities
A mathematical theory used by taxonomists, whereby they assume that no two individuals will simultaneously have the same combination of characters as those of a given species; ...
thermocline
n. [Gr. therme, heat; klinein, to slope] In the strata of rapidly changing temperatures in lakes, the narrow dividing stratum between the epilimnion and hypolimnion.
thermophile
n. [Gr. therme, heat; philos, loving] Living at high temperatures; hot springs fauna.
thermophobe
n. [Gr. therme, heat; phobos, hate] An organism that lives at low tempertures.
thermoreceptor
n. [Gr. therme, heat; L. recipere, to receive] A sensory receptor that reacts to temperature stimuli.
thermotaxis
n. [Gr. therme, heat; taxis, arrangement] A taxis in which heat is the response initiating stimulus; regulation of body temperature. thesocytes n. pl. [Gr. thesis, deposit; ...
thickness
n. [A.S. thicce, thick] (MOLLUSCA: Bivalvia) 1; see inflation. 2. Measurement from the inner to outer shell surface.
thigmotaxis
n.; pl. taxes [Gr. thigma, touch; taxis, arrangement] The taxis of contact; stereotaxis. a. Positive thigmotaxis: toward the contact. b. Negative thigmotaxis: away from the ...
thigmotropism
n. [Gr. thigma, touch; tropos, turn] Tropism in which direction is determined by contact with a solid body; stereotropism.
third axillary
(ARTHROPODA: Insecta) A Y-shaped sclerite of the wing, with a flexor muscle inserted into the crotch of the Y and usually articulating with the posterior notal process and a ...
third-form reproductive
(ARTHROPODA: Insecta) In Isoptera, an ergatoid reproductive; a tertiary reproductive.
thoracic
adj. [Gr. thorax, chest] Associated with the thorax.
thoracic ganglia
(ARTHROPODA: Insecta) The first three ganglia of the ventral nerve cord, one in each thoracic segment, controlling the locomotory organs.
thoracic glands
see prothoracic glands.
thoracic region
(ARTHROPODA: Insecta) The second of three regions of the embryonic trunk; the future locomotor center.
thoracic squama
(ARTHROPODA: Insecta) In some Diptera, one of three membraneous lobes in the region of the wing base appearing to be derived from the posterior margin of the scutellum; see ...
thoracomere
n. [Gr. thorax, chest; meros, part] (ARTHROPODA: Crustacea) A thoracic segment.
thoracopod(ite)
n. [Gr. thorax, chest; pous foot] (ARTHROPODA: Crustacea) Any appendage of the thoracic somite; a cormopod; see phyllopod, maxilliped, pereopod.
thorax
n.; pl. thoraxes, thoraces [Gr. thorax, chest] 1. (ARTHROPODA: Chelicerata) In Arachnida, fused with the head to form the cephalothorax of spiders. 2. (ARTHROPODA: ...
thread
n. [A.S. thraed, twist] 1. A fine linear surface elevation. 2. (MOLLUSCA: Bivalvia) A narrow elevation on the shell surface. 3. (MOLLUSCA: Gastropoda) The silky fibers of ...
thread capsule
see nematocyst.
thread cell
(CNIDARIA) The cnidoblasts.
thread press
see silk press.
thylacium
n. [Gr. thylax, sack] (ARTHROPODA: Insecta) An external gall-like cyst in the abdomen of the host containing the Dryinidae parasitic larva.
thylacogen
n. [Gr. thylax, sack; genes, producing] A chemical produced by parasites that cause hypertrophy of host tissue.
thyridium
n; pl. -ia [Gr. dim. thyris, window] (ARTHROPODA: Insecta) 1. A small whitish spot in the wings of Neuroptera, Hymenoptera and Trichoptera. 2. In ichneumonid Hymenoptera, a ...
thyroid
n. [Gr. thyra, oblong shield] (ARTHROPODA: Insecta) In Diptera, a shield-shaped plate on the posterior wall of the beak.
thysanuriform larva
see campodeiform larva.
tibia
n.; pl. -iae [L. tibia, shin] 1. (ARTHROPODA: Chelicerata) The fifth segment of a spider leg, between the patella and metatarsus. 2. (ARTHROPODA: Insecta) The fourth ...
tibial comb
(ARTHROPODA: Insecta) A strigil or scraper.
tibial epiphysis
see epiphysis.
tibial process
См. tibial thumb.
tibial spur
(ARTHROPODA: Insecta) A large spine usually located on the distal end of the tibia.
tibial thumb
(ARTHROPODA: Insecta) In Anoplura Pediculus , a delicate modification of the tibia as a holdfast against the powerful claw of the tarsus.
tibiotarsal organ
(ARTHROPODA: Insecta) In Collembola Sminthurides , a sac-like swelling and an enlarged hair occurring near the distal ends of the tibiotarsus of the third pair of legs.
tibiotarsus
n. [L. tibia, shin; Gr. tarsos, sole of foot] (ARTHROPODA: Insecta) Fused tibia and tarsus; the tibiotarsal segment.
Tiedemann's bodies
(ECHINODERMATA: Asteroidea) Tiny, 9 spherical swellings on the inner wall of the ring canal that have been reported to produce amebocytes.
timbal
see tymbal.
tinctorial
adj. [L. tenctorius, of dyeing] Of or pertaining to color, i.e., staining.
tine
n. [A.S. tind, spike] Any slender, pointed, projecting part.
tissue
n. [F. tissu, tissue] A layer or group of cells of a particular type, or at most a few types, with intercellular material of essentially a particular type.
tissue culture
Tissues appropriated from animals and maintained or grown in vitro for more than 24 hours.
titillae
n. pl.; sing. titilla [L. titillo, tickle] (NEMATA) Small projections on the distal part of the protrusile gubernaculum.
titillator
n. [L. titillo, tickle] (ARTHROPODA: Insecta) A terminal, small process (spines or small plates) at the distal extremity of the aedeagus.
tocopherol
n. [Gr. tokos, birth; pherein, to carry] Vitamin E.
tocospermal
adj. [Gr. tokos, birth; sperma, seed] Direct transfer of sperm between male and female.
tocospermia
n. [Gr. tokos, birth; sperma, seed] 1. (ARTHROPODA: Chelicerata) A type of sperm transfer by the male chelicera (gonopod), to the female vagina; see podospermia. 2. ...
tocostome
См. tokostome.
tokostome
n. [Gr. tokos, birth; stoma, mouth] (ARTHROPODA: Chelicerata) In Acari, the female genital aperture.
tomentum
n. [L. tomentum, stuffing of wool] Covered with closely matted scale-like hair or spines on the body or appendages that cannot be separated; downy; tomentose adj..
tone
see tonus.
tonic muscle
(MOLLUSCA: Bivalvia) White, opalescent part of the adductor muscle that reacts slowly, but can hold for long periods of time; catch muscle.
tonofibrillae
n.pl [Gr. tonos, stretching; L. dim. fibra, fiber] Fine connective fibrils extending from the ends of the skeletal muscles into the cuticle.
tonus
n. [Gr. tonos, stretching] 1. The normal, maintained nerve impulse traffic. 2. The normal prolonged steady contracture of muscle fibers; tonic adj..
topochemical sense
The sense of smell.
topogamodeme
n. [Gr. topos, place; gamos, marriage; demos, the people] Individuals inhabiting a particular geographic locality that form a deme.
topomorph
n. [Gr. topos, place; morphe, form] An environmental morphologic variant; topomorphic adj..
toponym
n. [Gr. topos, place; onoma, name] The name of a location thought to be the place of origin of a plant or animal.
topotype
n. [Gr. topos, place; typos, type] A specimen collected at the original type-locality.
tori
pl. of torus.
torma
n.; pl. -mae [Gr. tormos, socket] (ARTHROPODA: Insecta) 1. In Diptera, sclerotic processes between the labrum and clypeus. 2. In Scarabaeoidae larvae, heavily chitinized ...
tormogen
n. [Gr. tormos, socket; genes, producing] (ARTHROPODA: Insecta) An epidermal cell associated with a seta that secretes the cuticle of the socket and bounds the receptor ...
tornote
n. [L. tornatus, rounded with a lathe] (PORIFERA) A diactinal monaxon, lance-headed at each end.
tornus
see anal angle.
torose
adj. [L. torus, elevation] A swelling into knobs; cylindrical and swollen at intervals; torous.
torpid
adj. [L. torpidus, to be numb] Dormant; inactive; see aestivation, hibernation.
torqueate
adj. [L. torquatus, with a necklace] Having a ring or collar.
torsion
n. [L. torquere, to twist] 1. Spiral bending; twisting. 2. (MOLLUSCA: Gastropoda) The theory in ancestral gastropods that a 180-degree counterclockwise twisting occurred ...
tortuose
adj. [Gr. torquere, to twist] Twisting; winding; irregularly curved.
torulose
adj. [L. torulus, little bulge] Having knob-like swellings; moniliform.
torus
n.; pl. tori [L. torus, swelling] 1. A blunt, rounded, ridge or protuberance. 2. (ANNELIDA: Polychaeta) Low ridges provided with rows of acicular hooks or minute setae ...
totipotent
adj. [L. totus, all; potens, capable] Said of isolated blastomeres capable of becoming complete embryos.
totomount
n. [L. totus, all; mons, mountain] The mount of a whole organism for microscopic study.
toxa
n. [Gr. toxon, bow] (PORIFERA) A bow-shaped diactinal microsclere.
toxicognath
n. [Gr. toxikon, poison; gnathos, jaw] (ARTHROPODA: Chilopoda) The forcipulate poison fangs.
toxicology
n. [Gr. toxikon, poison; logos, discourse] The science of poisons.
toxin
n. [Gr. toxikon, poison] A poisonous substance in the secretions or excretions of a parasite.
toxinosis
n. [Gr. toxikon, poison] A disease caused by the action of a toxin.
toxoglossate
n. [Gr. toxon, bow; glossa, tongue] (MOLLUSCA: Gastropoda) Having a radula always enclosed in the radular sac; marginal teeth harpoon-shaped, filled with venom and ...
toxoid
n. [Gr. toxikon, poison; eidos, form] A toxin released from its toxic properties, but not from its antigenic properties.
trabecula
n.; pl. -lae [L. trabecula, little beam] 1. A small bar, rod, bundle of fibers, or septum together with other trabeculae which form part of the framework of various organs; ...
trabeculate
adj. [L. trabecula, small beam] (ANNELIDA: Oligochaeta) Used to describe seminal vesicles that develop as connective tissue proliferations from a septum that have ...
trachea
n.; pl. tracheae [L. trachia, windpipe] 1. The windpipe. 2. (ARTHROPODA: Chelicerata) For Arachnida, see tube trachae, sieve trachea. 3. (ARTHROPODA: Insecta) The larger ...
tracheal gills
(ARTHROPODA: Insecta) In aquatic larvae and some aquatic pupae, filiform, lamellate structures supplied with trachae and tracheoles, usually borne on the abdomen; see ...
tracheal system
(ARTHROPODA) A system of cuticle-line tube opening to the outside through spiracles, functioning in respiration.
tracheoblast
n. [L. trachia, windpipe; Gr. blastos, bud] (ARTHROPODA: Insecta) Cells derived from the epidermal cells lining the trachea, that give rise to the tracheoles.
tracheoles
n. [L. dim. trachia, windpipe] (ARTHROPODA: Insecta) The fine intracelluar terminal branches of the respiratory tubes; tracheolar adj..
trachychromatic
adj. [Gr. trachys, rough; chroma, color] Strongly staining.
tract
n. [L. tractus, region] 1. An area, region or parts of a system, as a bundle of nerve fibers between parts of the central nervous system. 2. (PORIFERA) A fascicular ...
Tragardh's organ
(ARTHROPODA: Chelicerata) In Acari, a long, conical hyaline protuberance of the articulation between the body of a chelicera, and its movable jaw; oncophysis.
tragus
n. [Gr. tragos, goat] (ARTHROPODA: Insecta) In Diptera, a somewhat elaborate lobe on the rim of the pinna of a laticorn trumpet of some culicid pupae.
transad
n. [L. trans-, across; Gr. ad, makes collective nouns] Closely related organisms separated by an environmental barrier.
transcoxa
n. [L. trans-, across; coxa, hip] (ARTHROPODA: Chelicerata) A term used instead of coxa in some groups.
transcurrent
adj. [L. trans-, across; currens, running] 1. Extending transversely. 2. (MOLLUSCA: Gastropoda) Passing continuously around whorls crossing growth lines.
transect
n. [L. trans-, across; secare, to cut] A cross section or profile of an area for study, as with organisms and/or vegetation.
transection
n. [L. trans-, across; secare, to cut] Cut across or transversely; a transverse section.
transformation zone
In males, that part of the testis follicle in which the spermatids develop into spermatozoa; known as spermiogenesis; see maturation zone.
transient
adj. [L. trans-, across; ire, to go] A passing phenomenon; of short duration.
transient polymorphism
Polymorphism existing in a breeding population during the period when an allele is being replaced by a superior one; see balanced polymorphism.
transitional cell
see chromophile.
translocation
n. [L. trans-, across; locus, place] The shift of a segment of a chromosome to another chromosome, not changing the total number of genes present.
translucent
adj. [L. trans-, across; lucere, to shine] Allowing the passage of light, but not necessarily transparent; semitransparent.
transmission
n. [L. trans-, across; mittere, to send] 1. Horizontal: the transfer of an infectious agent from one organism to another. 2. Vertical: transmission from one generation to ...
transposed hinge condition
(MOLLUSCA: Bivalvia) A condition of teeth usually found in the hinge of one valve being found on the opposite one.
transscutal suture
(ARTHROPODA: Insecta) 1. In many orders, a transverse suture connecting the lateral margins behind the anterior notal wing process, dividing the scutum into an anterior and ...
transstadial
adj. [L. trans-, across; stadium, stage] The retention of microorganisms from one stage of the host to the next; may be part or all of the host\'s life cycle.
transtilla
n.; pl. -lae [L. trans-, across; stilla, drop] (ARTHROPODA: Insecta) In Lepidoptera, a transverse bar, or variously shaped process, connecting dorso-proximal angles of the ...
transverse
adj. [L. trans-, across; vertere, to turn] Crossing at right angles to the longitudinal axis; lying across or between.
transverse band of crochets
(ARTHROPODA: Insecta) In larva, crochets being arranged transversely or across the longitudinal axis of the body in a single uniserial or multiserial band, or in two such ...
transverse costal vein
(ARTHROPODA: Insecta) A wing cross vein in the costal cell.
transverse cubital vein
(ARTHROPODA: Insecta) A transverse wing vein connecting the marginal and cubital veins.
transverse fission
A form of asexual reproduction by division of an organism at right angles to the long axis; see binary fission.
transverse impression
see genal groove.
transverse marginal vein
(ARTHROPODA: Insecta) A wing cross vein in the marginal cell.
transverse notal suture
see prescutal sulcus.
transverse partition
(BRYOZOA) A wall separating members of a successive line of zooids.
transverse plane
A plane or section perpendicular to the longitudinal axis.
transverse radial vein
(ARTHROPODA: Insecta) A transverse marginal wing vein.
transverse septum
(ARTHROPODA: Crustacea) In Cirripedia, the thin walled, normal to longitudinal septum, parallel to basis, dividing the parietal tubes into a series of cells.
transverse striation
A circular groove or arc whose plane is perpendicular to the longitudinal axis.
transverse suture
(ARTHROPODA: Insecta) In Diptera, a suture across the middle of the mesonotum of some species; usually incomplete in the center of the notum; in Tipulidae it is V-shaped.
transverse wall
(BRYOZOA: Gymnolaemata) One of a pair of walls separating individual zooids in a linear series; perpendicular to direction of growth.
trapezium
n. [Gr. trapezion, small table] A four-sided figure, having no two sides parallel; trapeziform.
trapezoid
n. [Gr. trapezion, small table; eidos, shape] A plane four-sided figure in which two sides are parallel and two are not. trapezoidal, trapeziform adj..
trema
n.; pl. tremata [Gr. trema, hole] (MOLLUSCA: Gastropoda) An orifice in the outer wall of some shells, excretory in function; may occur singly or in a series.
Trematoda
n. [Gr. trema, hole; eidos, form] A class of Platyhelminthes, commonly call flukes; all are endoparasitic flatworms.
trenchant
adj. [OF. trenchier, to cut] Having a sharp edge.
trepan
n. [Gr. trypanon, borer] (ANNELIDA: Polychaeta) Part of the eversible pharynx containing chitinized teeth anteriorly, especially Syllidae.
triact
n. [Gr. treis, three; aktis, ray] (PORIFERA) A microsclere spicule with three rays; see regular triact, saggital triact.
triactinal
adj. [Gr. treis, three; aktis, ray] (PORIFERA) Having a three-pointed or rayed spicule; see diactinal, tetractinal, monactinal.
triad
n. [Gr. treis, three; -ad, forms collective noun] An arrangement of three; a trinity.
triaene
n. [Gr. triaina, trident] (PORIFERA) A tetraxonid spicule with three rays shorter than the fourth.
triage
n. [F. a culling] The process of grading.
triangle
n. [L. triangulus, having three angles] (ARTHROPODA: Insecta) In Odonata, a small triangular cell or group of cells near the base of the wing; discoidal triangle; cardinal ...
triangular plates
(ARTHROPODA: Insecta) In Hymenoptera, the second of three pairs of movable plates associated with the sting; see quadrate plates, oblong plates.
triaulic
adj. [L. tres, three; aulos, pipe] (MOLLUSCA: Gastropoda) In opisthobranch hermaphroditic snails, the female part having two separate openings and the male part one; see ...
triaxial symmetry
A type of symmetry such as biradial- or bilateral symmetry, with three axes known as sagittal, longitudinal, and transverse.
triaxon
n. [Gr. tries, three; axon, axle] (PORIFERA) A spicule with three axes.
tribe
n. [L. tribus, tribe] A taxonomic category containing a group intermediate between the genus and the subfamily; names of tribes end in -ini.
tribocytic organ
(PLATYHELMINTHES: Trematoda) In Strigeiudea, a glandular, pad-like organ behind the acetabulum.
trichite
n. [Gr. trix, hair] (PORIFERA) Hair-like siliceous spicule.
trichobothrium
n.; pl. -ria [Gr. thrix, hair; bothros, pit] (ARTHROPODA: Chelicerata) A compound structure of many groups consisting of a small cavity (bothridium) and variously shaped ...
trichobranchia
n. pl. [Gr. thrix, hair; branchia, gill] (ARTHROPODA: Crustacea) A gill with a series of filamentous lateral branches arising from the main stem or branchial axis.
trichocerous
adj. [Gr. thrix, hair; keras, horn] (PLATYHELMINTHES: Trematoda) Pertaining to cercaria having a tail provided with conspicuous spines or bristles.
trichodes
see trichomes.
trichodragmata
n. pl. [Gr. thrix, hair; dragma, sheaf] (PORIFERA: Desmospongiae) In Axinellidae ( Tragosia ), raphides grouped into bundles.
trichogen
n. [Gr. thrix, hair; genes, producing] (ARTHROPODA: Insecta) An epidermal cell that secretes the cuticle of the seta or peg, the scolopale and the pore tubules.
trichoid
adj. [Gr. thrix, hair; eidos, form] Formed like a hair.
trichoid sensilla
see sensillum trichodeum.
trichomes
n. pl. [Gr. thrix, hair] 1. (ARTHROPODA: Insecta) Modified tufts or hair on certain myrmecophilous and non-myrmecophilous insects that aid in the dissemination of ...
trichophore
n. [Gr. thrix, hair; pherein, to bear] (ANNELIDA) A saclike structure or cavity from which setae emerge.
trichopore
n. [Gr. thrix, hair; poros, channel] (ARTHROPODA: Insecta) A pore in the cuticle through which a sensory hair or bristle is formed.
trichosors
n. pl. [Gr. thrix, hair] (ARTHROPODA: Insecta) In Neuroptera, thickenings of the wing margin bearing several hairs; a single trichosor between each pair of vein-endings in ...
trichostichal bristles
see metapleural bristles.
trichotomous
adj. [Gr. tricha, in three parts; tome, a cutting] Divided into three parts; three-forked.
trichroism
n. [Gr. treis, three; chros, color] The condition of having three color forms in different individuals of the same species.
tricolumella
see columella.
tricostate
adj. [Gr. treis, three; costa, rib] Having three ribs or ridges.
tricrepid
adj. [Gr. treis, three; krepis, base] (PORIFERA) A triaxonid desma.
tricuspid
См. tricuspidate.
tricuspidate
adj. [Gr. treis, three; cuspis, a point] Divided into three cusps or points.
tridactyl
adj. [Gr. treis, three; daktylos, finger] (ARTHROPODA) Pertaining to an appendage, ambulacrum, or claw with three ungues; see monodactyl, bidactyl.
trident
adj. [L. tres, three; dens, tooth] Having three teeth; three-pronged; tridentate adj..
trifid
adj. [L. tres, three; findere, to split] Having three clefts, parts, or branches.
trifid nerve
(BRYOZOA) A three-branched peripheral motor nerve connected to the retractor muscle, esophagus, and along the tentacle sheath to the direct nerve.
trifurcate
adj. [L. tres, three; furca, fork] Having three branches or forks; trichotomous.
triglycerides
n. pl. [Gr. treis, three; glykys, sweet] Esters of fatty acids with glycerin that form fats and oils.
trignathan
adj. [Gr. treis, three; gnathion, jaw] (ARTHROPODA) Having mandibles and two pair of maxillae, such as Chilopoda, Symphyla and Insecta; see dignathan.
trigonal
adj. [Gr. treis, three; gonia, angle] Pertaining to, or in the form of a triangle.
trigoneutism
n. [Gr. treis, three; gonos, offspring] The production of three broods in one season.
trilabiate
adj. [L. tres, three; labium, lip] Having three lips.
trilateral
adj. [L. tres, three; latus, side] Three-sided.
trilobate
adj. [Gr. treis, three; lobos, lobe] Bearing three lobes.
trilocular
adj. [L. tres, three; loculus, small place] With three cavities or cells.
trimorphic
adj. [Gr. treis, three; morphe, form] Having three distinct forms in one individual, as certain hydrozoan colonies.
Trinominal nomenclature
An extension of the binominal system of nomenclature consisting of three words: the generic name, the specific name, and the subspecific name, together constituting the ...
triordinal crochets
(ARTHROPODA: Insecta) Crochets of larvae with proximal ends in a single row, but distal ends of three alternating lengths; see ordinal.
tripartite
adj. [L. tres, three; partitus, divided] Divided into three parts, divisions or segments.
tripectinate
adj. [L. tres, three; pecten, comb] Having three rows of comb-like branches.
triplet
n. [L. tres, three; plus, more] Three successive nucleotide base pairs that code for an amino acid.
triploblastic
adj. [Gr. triploos, threefold; blastos, bud] Derived from three embryonic germinal layers: ectoderm, endoderm and mesoderm.
triploid
adj. [Gr. triploos, threefold] A cell or individual having three haploid chromosome sets in their nuclei; a form of polyploidy.
triquetral
См. triquetrous.
triquetrous
adj. [L. triquetrus, three sided] Having three angles or arms; triangular in section.
triradiate
(s) adj. [L. tres, three; radius, spoke of wheel] 1. Having three radiating process. 2. (PORIFERA) Spicules having the three rays somewhat in the same plane; see sagittal ...
tritocerebral commissure
see postesophageal commissure.
tritocerebral segment
see tritocerebrum.
tritocerebrum
n. [Gr. tritos, third; L. cerebrum, brain] (ARTHROPODA) The posterior (third) small part of an arthropod brain that gives rise to nerves that innervate the labium, the ...
tritonymph
n. [Gr. tritos, third; nymphe, young woman] (ARTHROPODA: Chelicerata) In Acari, the third stage nymph.
tritosternum
n. [Gr. tritos, third; sternon, chest] (ARTHROPODA: Chelicerata) In Mesostigmata, a secondary, ventral, bristlelike sensory organ just behind the gnathosoma.
triturate
v.t. [L. tritum, rub to pieces] To rub or grind to a fine powder; masticate; pulverize.
triungulin
См. triungulinid.
triungulinid
n. [L. tres, three; ungula, claw] (ARTHROPODA: Insecta) First-instar larva of some hypermetamorphic Neuroptera, Coleoptera, Hymenoptera, and the Strepsiptera (triungulinid), ...
trivial name
An obsolete designation by Linnaeus for the specific name; vernacular name.
trivium
n. [L. trivium, crossroads] (ECHINODERMATA: Asteroidea) Collectively, the three rays of a sea star farthest from the madreporite; see bivium.
trivoltine
n. [L. tres, three; It. volta, time] (ARTHROPODA: Insecta) Having three annual broods, especially in the silkworms of Bombycidae.
trixenic
adj. [Gr. treis, three; xenos, guest] The rearing of one or more individuals of one species in association with three known species of organisms; see axenic, dixenic, ...
troch
n. [Gr. trochos, wheel] A band of cilia found on trocophores and related larvae.
trochal disc
(ROTIFERA) Anterior ciliated disc functioning in locomotion and/or food ingestion.
trochalopodous
adj. [Gr. trochos, wheel; pous, foot] (ARTHROPODA: Insecta) Refers to a posterior coxae having an articulation of a ball and socket joint; see pagiopodous.
trochantellus
n. [Gr. dim. trochanter, runner] (ARTHROPODA: Insecta) In Hymenoptera, the proximal end of the femur; sometimes appearing as a second segment of the trochanter.
trochanter
n. [Gr. trochanter, runner] (ARTHROPODA) A segment or segments of an insect or acarine leg that articulate basally with the coxa and distally with the femur; a pivot or ...
trochanteral organ
(ARTHROPODA: Insecta) In Collembola, a group of short setae on the trochanter.
trochantin
n. [Gr. trochanter, runner] (ARTHROPODA: Insecta) Any small intercalated sclerite of an insect appendage. a. The basal segment of the trochanter when two-jointed. b. A ...
trochiform
adj. [Gr. trochos, wheel; forma, shape] 1. Shaped like a top. 2. (MOLLUSCA: Gastropoda) In Trochidae, a flat-sided conical shell, without a highly acute spire and rather ...
trochlea
n. [Gr. trochilia, pulley] A pulley-like structure, short, circular, compressed and contracted in the middle of the circumference.
trocholophous
adj. [Gr. trochos, wheel; lophos, crest] (BRACHIOPODA) A lophophore with a simple disk around the mouth, bearing usually a single row of unpaired filamentary appendages, ...
trochophore
n. [Gr. trochos, wheel; phora, bearing] An invertebrate free-swimming larva found in many groups, marine turbellarians, nemerteans, brachiopods, phoronids, bryozoans, ...
trochosphere
see trochophore.
trochus
n.; pl. trochi [Gr. trochos, wheel] (ROTIFERA) The inner, anterior circlet of coronal cilia along the margin of the apical band; cingulum.
troglobiont
n. [Gr. trogle, hole; bios, life] A cave dwelling organism; troglobite.
troglodytic
adj. [Gr. trogle, hole; dyein, to enter] Living underground only.
troglophile
n. [Gr. trogle, hole; philein, to love] 1. Cave-loving. 2. (ANNELIDA: Oligochaeta) Many species of earthworms are referred to in this manner, however, they are not obligatory ...
trogloxene
n. [Gr. trogle, hole; xenos, guest] 1. A cave guest. 2. Sometimes used to characterize organisms that do not complete all of their life cycle in caves.
tropeic
adj. [Gr. tropis, keel] Resembling a keel; cariniform.
trophallaxis
n. [Gr. trophe, food; allaxis, exchange] (ARTHROPODA: Insecta) The mutual or unilateral exchange of alimentary canal liquid, from the mouth or anus, among colony members ...
trophamnion
n. [Gr. trophe, food; amnion, membrane around the fetus] (ARTHROPODA: Insecta) An envelope surrounding the embryonic mass in the polyembryonic ova of mainly parasitic ...
trophi
n. pl.; sing. trophus [Gr. trophe, food] 1. (ARTHROPODA) The mouth parts, especially of insects and barnacles, collectively. 2. (ROTIFERA) The mastacatory apparatus of the ...
trophic chord
(ARTHROPODA: Insecta) In telotrophic ovarioles, slender chords connecting the nurse cells to the eggs.
trophic egg
(ARTHROPODA: Insecta) In Apis, an egg that is fed to the colony members, usually degenerate and nonviable.
trophic pouch
(ARTHROPODA: Insecta) In Siphunculata (Anoplura), a pouch opening off the cibarium housing three closely compressed stylets, with only the anterior end exposed, functioning ...
trophic sac
См. trophic pouch.
trophic symbiosis
A form of symbiosis between a social insect and another organism; tended by the social insect for the sake of the food or secretions they derive from them; see trophallaxis, ...
trophidium
n. [Gr. dim. trophe, food] (ARTHROPODA: Insecta) In Hymenoptera, the first larval stage of some Formicidae.
trophobiont
n. [Gr. dim. trophe, food; bios, life; ont, one who] (ARTHROPODA: Insecta) An organism living in a social species nest, or cared for and protected by a social species in ...
trophobiosis
n. [Gr. trophe, food; biosis, manner of life] A form of symbiosis in which there is a mutual exchange of food; trophallaxis; trophobiotic a; see trophic symbiosis.
trophocytes
n. pl. [Gr. trophe, food; kytos, container] 1. Cells that provide nutritive material. 2. (ARTHROPODA: Insecta) Cells of the fat body of the embryo. 3. (PORIFERA) In ...
trophodisc
n. [Gr. trophe, food; diskos, disc] (CNIDARIA: Hydrozoa) In the female gonophore, endodermal tissue that nourishes sperm or ova.
trophogeny
n. [Gr. trophe, food; genes, producing] (ARTHROPODA: Insecta) In social insects, caste difference determined by nutritional mechanism.
trophoporic field
(ARTHROPODA: Insecta) In social insects, the environment from which the colony gains food.
trophorhinium
n. [Gr. trophe, food; rhine, rasp] (ARTHROPODA: Insecta) In Hymenoptera, two striated plates located within the mouth of Myrmeciinae larvae that grind their food pellets.
trophosome
n. [Gr. trophe, food; soma, body] 1. (CNIDARIA: Hydrozoa) All of the asexual structures of a polyp or polypoid hydrozoan colony; see gonosome. 2. (NEMATA) A food ...
trophotaxis
n. [Gr. trophe, food; taxis, arrangement] A response to the stimulation of food; see telotaxis, klinotaxis.
trophothylax
n. [Gr. trophe, food; thylax, sack] (ARTHROPODA: Insecta) In Hymenoptera Formicidae, a specialized pouch of Pseudomyrmecinae larvae located on the ventral part of the thorax ...
trophozooid
see gastrozooid.
trophus
pl. see trophi.
tropis
n. [Gr. tropus, keel] 1. (ARTHROPODA: Crustacea) In Ostracods, a heavy chitinous (or two unfused rods) connecting the zygum to the sternix and pastinum. 2. (NEMATODA: ...
tropism
n. [Gr. tropos, turn] A movement, orientation or locomotion of a motile organism in response to a stimulus. a. Positive tropism: toward the stimulus. b. Negative ...

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