Слова на букву cycl-eleu (732) Dictionary of invertebrate zoology
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Слова на букву cycl-eleu (732)

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diagenodont teeth
(MOLLUSCA: Bivalvia) Having differentiated cardinal teeth (up to 3) and lateral teeth (up to 2) on the hinge plate.
n.; pl. -noses [Gr. diagignoskein, to distinguish] A formal statement of the characters distinguishing one taxon from closely related taxa.
adj. [Gr. diagignoskein, to distinguish] Uniquely characterizing a taxon.
diagonal ridge
(MOLLUSCA: Bivalvia) A ridge running diagonally from the umbo toward the posteriolateral margin of the valve.
n. [Gr. dia, through; kinesis, movement] The final stage of prophase in the first meiotic division; paired, contracted chromosomes with the disappearance of nucleolus and ...
n. [Gr. dialyein, to reconcile; neuron, nerve] (MOLLUSCA: Gastropoda) Having zygoneural connections on both left and right sides.
n. [Gr. dia, through; lyein, to loose] Used for both the material that will and will not diffuse through a membrane.
n.; pl. dialyses [Gr. dia, through; lyein, to loose] Separation of dissolved crystalloids and colloids through a suitable membrane.
См. dialysate.
n. [Gr. dia, through; morphe, form] (PORIFERA) A cell mass of spherical form and a continuous pinacoderm formed as a result of aggregation of dissociated cells.
n. [Gr. dia, through; pausis, a stopping] A quiescent phase during the development of an organism in which most physiological processes are suspended; maybe optional, ...
adj. [Gr. dia, through; phanos, light] Showing light through its substance; transparent; translucent; clear.
n. [Gr. diaphragma, partition, wall] 1. Any of the horizontal dividing membranes of a body cavity. 2. A structure controlling admission of light through an aperture. 3. ...
diapolar cells
(MESOZOA) Ciliated somatodermal cells located between the parapolar and uropolar cells; trunk cells.
n. pl. [Gr. dis, twice; rhysus, delivering] (PORIFERA: Hexactinellida) Radial canals that run through the skeletal wall and have a single flagellated chamber.
n. [Gr. dis, twice; arthron, joint] An articulation that permits free movement; diarthrodial adj..
adj. [Gr. dis, twice; articulus, joint] Said of, or pertaining to two joints.
См. diastatic.
see amylase.
n. [Gr. diastole, difference] The regular expansion of the heart during which it fills with blood; the relaxatory phase; diastolic a; see systole.
adj. [Gr. dia, through; stoma, mouth] Through the stomata or pores.
adj. [Gr. dia, through; stoma, mouth] (ARTHROPODA: Insecta) Pertaining to the orifice, (excluding ostiole), of the metathoracic scent gland of Heteroptera, consisting of a ...
n. [Gr. dia, through; thesis, position] An inherited constitutional state whereby an individual is especially vulnerable to a certain type of reaction, disease or ...
diatom rake
(ARTHROPODA: Insecta) A structure of the galea of mayfly nymphs composed of bristles and pectinated spines, or of hairs or spines on the maxillae, functioning in scraping ...
adj. [Gr. dis, twice; aulos, pipe] 1. With two separate ducts open to the surface. 2. (MOLLUSCA: Gastropoda) Male and female portions with separate gonopores; see monaulic, ...
n. [Gr. dis, twice; axon, axis] Having two axes or two axis-cylinder processes.
n. [Gr. dis, twice; blastos, bud] (CNIDARIA) A coelenterate embryo consisting of 2 layers arranged around a central cavity.
adj. [Gr. dis, twice; branchia, gills] Having two gills.
adj. [Gr. dis, twice; kentron, midpoint of a circle] Having chromosomes or chromatids with two centromeres.
См. dicerus.
adj. [Gr. dis, twice; keros, horn] Having two horns, tentacles or antennae.
n. [Gr. dicha, in two; gamos, marriage] The production of male and female gametes at different times in an hermaphroditic organism; protogynous and protandrous hermaphrodites; ...
n. [Gr. dicha, in two; L. patria, native country] Populations geographically separated to the extent that individuals of the involved species never meet; see parapatric ...
adj. [Gr. dicha, in two; ops, sight] Having eyes separated dorsally by integument; see holoptic.
v.t. & i. [Gr. dicha, in two; temnein, to cut] To cut into two parts; to divide into pairs.
adj. [Gr. dicha, in two; temnein, to cut] Divided or dividing into two parts; successive bifurcation; two-forked.
n. [Gr. dicha, in two; triaina, trident] (PORIFERA) A tetractinal megasclere with forked clads.
n. [Gr. dis, twice; chros, color] The property of showing two very different colors, one by transmitted light and the other by reflected light, or as some dyes staining ...
adj. [Gr. dis, twice; chroma, color] 1. Having two color varieties. 2; seeing only two colors.
dichthadiform ergatogyne
(ARTHROPODA: Insecta) In army ants, an individual of an aberrant reproductive caste, characterized by a wingless alitrunk, large gaster, and expanded postpetiole.
n. [Gr. dichthadios, double; gyne, female] (ARTHROPODA: Insecta) A permanently wingless ant with greatly reduced eyes, massive pedicel, abdomen and ovaries, and strong legs. ...
adj. [Gr. dis, twice; kondylos, knuckle] Pertaining to an articulation with two condyles; bicondylar.
see secundibracts.
n. [Gr. dikranon, pitchfork; klon, twig] (PORIFERA) A megasclere spicule having a desma with swollen terminal couplings.
dictyonal framework
(PORIFERA) Spicules fused together into a rigid framework.
n.; pl. dictyonalia [Gr. diktyon, net] (PORIFERA: Hexactinellida) Rays of regular hexactines fused at their tips to form a more or less regular three dimensional network.
n. [Gr. diktyon, net; soma, body] The flattened set of membranes resembling a stack of plates found in a Golgi body.
adj. [Gr. dis, twice; kyklos, circle] (ECHINODERMATA: Crinoidea) Calyx plates of primitive stalked crinoids that have an additional five infrabasal plates on the ...
adj. [Gr. dis, twice; daktylos, finger] Having two tarsi of equal length; didactyl n.; didactylism n.; didactylous adj..
adj. [Gr. dis, twice; delphys, womb] Having two uteri; see amphidelphic.
diductor muscles
(BRACHIOPODA) Two pairs of muscles that open valves of articulates, commonly attached to brachial valve immediately anterior to beak; principal pair usually inserted in ...
adj. [Gr. didymos, double] Formed in pairs; twin; double.
n. [Gr. dia, through; ekdysis, escape from molt] Condition in which ecdysial processes are going on continuously and one ecdysis cycle passes rapidly into another.
see dioecious.
adj. [L. dies, day] Occurring in a 24 hour period.
n.; pl. -ae (BRYOZOA) Large laterobasal pore chamber that functions in interzooidal communication; see pore chambers.
n.; pl. -tiae [L. differentia, difference] The specific difference of one species from other species of the same genus.
differential diagnosis
A statement of characters distinguishing a given taxon from other specifically mentioned equivalent taxa; see delimitation.
adj. [L. dis, twice; frangere, to break] 1. Bent in different directions. 2. Separated into parts.
n. [L. diffusus, spread out] Material that diffuses through a semi-permeable membrane; dialyzate.
adj. [L. diffusus, spread out] 1. Not sharply distinct at the edge or margin. 2. Widely spread; extended. 3. (MOLLUSCA: Gastropoda) The aperture when spread out or widened.
n. [L. diffusus, spread out] The spreading of a dissolved substance through solvent by virtue of the random movements of its molecules or ions.
diffusion tracheae
(ARTHROPODA: Insecta) Cylindrical tracheae not subject to collapse; see ventilation tracheae.
see heterogametic.
n. [Gr. dis, twice; genesis, beginning] Alternation of generations.
adj. [Gr. dis, twice; genesis, beginning] With sexual reproduction in the mature forms and asexual reproduction in larval stages.
adj. [Gr. dis, twice; genos, birth; poros, passages] Having two genital pores.
n. [L. digestus, render food assimilable] The process by which nutrient materials are rendered soluble and absorbable for incorporation into the metabolism.
n. [L. digitus, finger] A finger or finger-like structure; a toe.
adj. [L. digitus, finger] Digit-like.
digitate processes
(SIPUNCULA) Finger-like processes or leaf-like projections originating at the dorsal surface of the brain.
adj. [L. digitus, finger] Fingered or clawed; divided into finger-like processes.
n. [L. digitus, finger] (MOLLUSCA: Gastropoda) The fingerlike, outward projection from the outer lip of the shell.
n. pl. [L. dim. digitus, finger] (CNIDARIA: Scyphozoa) Tentacle- like gastric filaments on the inner edge of each septum.
adj. [L. digitus, finger; forma, shape] Shaped like, or functioning like a finger.
n. [L. digitulus, little finger] (ARTHROPODA: Insecta) Appendages in the form of dilated or knobbed hairs on the feet of scale insects; see empodium.
n.; pl. -ti [L. digitus, finger] 1. A digit. 2. (ARTHROPODA: Insecta) a. The dactylus. b. In Hymenoptera genitalia, a curved or hooked, strongly muscled process projecting ...
adj. [Gr. dis, twice; glyphein, to engrave] (CNIDARIA: Anthozoa) In sea anemones, having two siphonoglyphs: one siphonoglyph= sulcus; two siphonoglyphs= sulculus.
adj. [Gr. dis, twice; gnathion, jaw] (ARTHROPODA) Having mandibles and one pair of maxillae, such as Pauropoda and Diplopoda; see trignathan.
adj. [Gr. dis, twice; goneuein, to produce] Having two broods in one year; digoneutism n.
adj. [Gr. dis, twice; gone, seed] Sperm and ova are produced in separate gonads of the same individual; see syngonic, amphigonic.
adj. [Gr. dis, twice; kontos, punting pole] Biflagellate.
v.t.; -ated [L. dis, apart; lacera, torn] To tear to pieces; tear apart.
adj. [L. dilatus, spread] Having a wide margin; flattened; expanded; widened.
v.t. [L. dilatus, spread] To expand or distend.
n. [L. dilatus, spread] A muscle that functions to dilate.
dilator valve
(NEMATA) Ventrolateral hypodermal muscles that function to open the vulva; see constrictor valve.
adj. [L. dilutus, mixed] Being diluted; thin; weak.
adj. [Gr. dis, twice; meros, part] 1. Having two parts. 2. Bilaterally symmetrical.
adj. [Gr. dis, twice; meros, part] 1. Composed of two parts. 2. Having two tarsal segments.
adj. [L. dimidius, half] 1. Divided into two equal parts. 2. Only one-half the normal development. 3. (ARTHROPODA: Insecta) Having an elytra that covers only half the ...
n. [Gr. dis, twice; morphe, form] An individual displaying dimorphism.
a; see sexual dimorphism, polymorphism.
n. [Gr. dis, twice; morphe, form] A morphological difference in form, color, size or sex in a single population.
n. pl. [Gr. dis, twice; mys, muscle] (MOLLUSCA: Bivalvia) Taxon sometimes used to include those bivalve mollusks whose shells are closed by two adductor muscles;.
См. dimyaric.
adj.; dimyarian adj. & n.
n. [Gr. deinos, terrible; ergates, worker] (ARTHROPODA: Insecta) A soldier ant, characterized by a huge head and mandibles (for defense) and a thoracic structure sometimes ...
n. [Gr. deinos, terrible; ergates, worker; gyne, woman] (ARTHROPODA: Insecta) A mosaic form in ants, combining the characteristics of a dinergate and a ergatogyne.
n. [Gr. deinos, terrible; gyne, woman; morphe, form] (ARTHROPODA: Insecta) In ants, any individual in which female characteristics alternate with worker and soldier.
n. [Gr. deinos, terrible; phthisis, decline; ergates, worker] (ARTHROPODA: Insecta) In ants, a soldierworker pupal mosaic that fails to progress to the adult stage due to ...
adj. [Gr. dis, twice; oikos, house] Separate sexes; males and females being different individuals; gonochoristic; unisexual; opposed to monoecious.
adj. [Gr. dis, twice; ops, eye] Having eyes or ocelli divided by a septum or line.
adj. [Gr. dis, twice; ops, eye] Refractive; vision by refraction of light.
adj. [Gr. dis, twice; orchis, testicle] Having two testes; see monorchic.
diphagous parasitoid
(ARTHROPODA: Insecta) In Hymenoptera, a species in Adelinidae in which the male (parasitoid) and female inhabit the same host species, but both feed differently; see ...
adj. [Gr. diphyes, twofold; genesis, beginning] Producing two different types of embryos.
adj. [Gr. dis, two; phyle, race) Pertaining to animals which are derived from two ancestral lines.
n. [Gr. dis, twice, dim. pleuron, side] (ECHINODERMATA) Collective term applied to planktonic bilaterally symmetrical, ciliated larvae; echinopaedium; see auricularia, ...
n. [Gr. diploos, twofold; bionai, to live] An organism with two morphologically distinct haploid and diploid generations; see haplobiont.
adj. [Gr. diploos, twofold; blastos, bud] Having two embryonic germ layers, ectoderm and endoderm.
diplocotylea cercaria
(PLATYHELMINTHES: Trematoda) An amphistome cercaria with a pigmented anterior end; see pigmenta cercaria.
adj. [Gr. diploos, twofold; hodos, way] (PORIFERA) Leuconoid sponges with narrow canals leading into and out of the flagellated chambers; see aphodus, prosodus.
n. [Gr. diploos, twofold; ergates, worker] (ARTHROPODA: Insecta) A mosaic ant showing characteristics of both major and media workers.
adj. [Gr. diploos, twofold; ganglion, ganglion] With paired ganglia.
adj. [Gr. diploos, twofold] Having dual (2n) chromosomes, the normal number of cells in all but the mature germ cells in any individual derived from a fertilized egg; see ...
n. [Gr. diploos, twofold; karyon, nut] The nucleus of the zygote containing two diploid genomes; see amphikaryon.
adj. [Gr. diploos, twofold; nema, thread] When chromosome tetrads begin separation, resulting in chiasmata at the points of cross over; sometimes used to denote diplotene ...
adj. [Gr. diploos, twofold; neuron, nerve] Having a double nerve supply.
n. [Gr. diploos, twofold; on, being] An organism with diploid somatic cells and haploid gametes; see haplont.
n. [Gr. diploos, twofold; phasis, state] Diploid phase in the life cycle of an animal (fertilization to meiosis); diplotene stage in the prophase of meiosis; zygophase; ...
n. [Gr. diploos, twofold; pous, foot] A class of arthropods, commonly called millipedes, having the body somites fused into diplosegments, each with two pairs of legs.
См. diplopod.
n. [Gr. diploos, twofold; L. segmentum, piece] (ARTHROPODA: Diplopoda) Fusion of two body segments resulting in a segment with two pairs of legs each; a diplosomite.
n. [Gr. diploos, twofold; soma, body] A double centrosome; paired centrioles.
n. [Gr. diploos, twofold; soma, body] (ARTHROPODA: Diplopoda) A diplosegment; see prozonite, metazonite.
adj. [Gr. diploos, twofold; stenos, narrow; oikos, house] Pertains to the phenomena of certain species occurring in two contrasting habitats.
adj. [Gr. diploos, twofold; stichos, line] 1. Arranged in two rows or series. 2. (NEMATODA: Adenophorea) In Mermithida, the stichosome.
n. [Gr. diploos, twofold; L. dim. stoma, mouth] (PLATYHELMINTHES: Trematoda) Strigeoid metacercaria in the family Diplostomatidae. diplotene adj. [Gr. diploos, twofold; ...
adj. [Gr. diploos, twofold; zoon, animal] Bilaterally symmetrical.
adj. [Gr. dis, twice; pneumon, lung] Having two lungs.
n. [Gr. dis, twice; porpe, buckle] (PLATYHELMINTHES: Trematoda) A larval stage in the life cycle of the monogean Diplozoon that permanently unites with another.
n. [Gr. dis, twice; pteron, wing; dim. kekis, gall] (ARTHROPODA: Insecta) A gall formed by any dipterous insect.
adj. [Gr. dis, twice; pteron, wing] (ARTHROPODA: Insecta) Belonging to the insect order Diptera.
direct eyes
(ARTHROPODA: Chelicerata) The anterior median pair of eyes in spiders.
direct metamorphosis
see incomplete metamorphosis.
direct wing muscles
(ARTHROPODA: Insecta) The axillary and dorsal muscles of a wing.
directive mesentaries
(CNIDARIA: Anthozoa) In Zoantharia, the dorsal and ventral pairs of specialized mesentaries attached to the siphonoglyph.
directive rib
(MOLLUSCA: Bivalvia) A rib on the shell surface lying in a single plane.
directive spiral
(MOLLUSCA: Bivalvia) A directive rib that is spiral in a single plane.
n. pl. [L. dis, twice; saccharum, sugar] A carbohydrate which can be hydrolized into two monosaccharides.
См. disk.
discal area
(ARTHROPODA: Insecta) In wings, the central area or area covered by the discal cell.
discal bristle
(ARTHROPODA: Insecta) In Diptera, one or more pairs of bristles in the mid-dorsal wall of the abdominal segment.
discal cell
(ARTHROPODA: Insecta) A cell in the basal or central part of the wings.
discal cross vein
(ARTHROPODA: Insecta) A cross vein behind the discal cell in a wing.
discal elevation
(ARTHROPODA: Insecta) In Hemiptera, the central area of the anterior wing raised above the surrounding level.
discal patch
(ARTHROPODA: Insecta) In male hesperoid butterflies, conspicuous patches, tufts, or brushes of modified scales, sometimes contained in eversible folds of the anterior wing.
discal scutellar bristles
see dorsoscutellar bristles.
discal seta
(ARTHROPODA: Insecta) Large seta on the dorsal surface of the operculum.
discal vein
(ARTHROPODA: Insecta) In Lepidoptera, a crossvein closing the discal or median cell of the wing.
adj. [L. discus, circular plate; forma, shape] Having the shape of a plate or disc; discoid.
n. [L. discus, circular plate] (BRACHIOPODA:Inarticulata) A planktonic bivalve larva with round valves, and five pairs of major setae, the fourth of which is larger than the ...
adj. [L. dis, twice; Gr. skleros, hard] (ARTHROPODA) Pertaining to tergites and sternites being distinct and separate; see synscleritous.
discocellular vein
(ARTHROPODA: Insecta) The discal vein.
n. pl. [Gr. diskos, circular plate; okto, eight; aster, star] (PORIFERA) Spicules containing 8 rays terminating in disks; discooctasters.
adj. [Gr. diskos, circular plate; daktylos, finger] Having a sucker at the end of a digit.
n. [Gr. diskos, circular plate; hex, six; aster, star] (PORIFERA) A spicule with 6 rays meeting at right angles and terminating in discs; the individual rays may be ...
adj. [Gr. diskos, circular plate; eidos, form] 1. Flat and circular; disc-like; disciform; discous. 2. (MOLLUSCA) Certain univalve shells with whorls coiled in one plane. ...
adj. [Gr. diskos, circular plate: eidos, form] 1. Approaching a disc in form. 2. (MOLLUSCA: Gastropoda) Convolute or involute and more or less flattend, as the spire of a ...
discoidal area
1. The middle area of an organ. 2. (ARTHROPODA: Insecta) The middle of a wing; discoidal field.
discoidal areolets
see discal cells.
discoidal cell
(ARTHROPODA: Insecta) 1. An outstanding cell of a wing. 2. In Odonata, the quadrilateral. 3. In Diptera, the median cell.
discoidal crossvein
see discal cross vein.
discoidal field
see discoidal area.
discoidal triangle
see triangle.
discoidal vein
(ARTHROPODA: Insecta) 1. In Hymenoptera, the vein forming a continuation of the median vein beyond the end of the transverse median vein, and extending along the posterior ...
См. discolour.
n. [L. discolor, of different colors] Change of color; more than one color.
discontinued varices
(MOLLUSCA: Gastropoda) Varices of shell formation when revolution is not in a straight line with those of the next.
discontinuous variation
Phenotypic variation in an animal population in which the characters do not grade into each other; qualitative inheritance; see continuous variation.
see discoctasters.
discordent margins
(MOLLUSCA: Bivalvia) Valve margins not matching, but overlapping one another.
n. [Gr. diskos, circular plate; rhabdos, rod] (PORIFERA) A linear spicule with disc-like outgrowths arising from a straight axis.
n. [Gr. diskos, circular plate] (ARTHROPODA: Insecta) Adult development from imaginal discs in the embryo; see adiscota.
n. [Gr. diskos, circular plate; triaina, trident] (PORIFERA) A tetractinal spicule with three rays flattened flush in one plane with a short pointed fourth axis.
adj. [L. discrepantia, discordancy] Discordant; disagreeing; different.
adj. [L. discretus, separated] Well separated; applied to distinct parts.
n. [L. discrimen, division] (ARTHROPODA: Insecta) A median longitudinal sulcus with an internal ridge running along the middle of the sternum.
n. [L. discus, circular plate] A flat circular structure, part or area.
n. [L. dis, without; F. aise, comfort] An alteration of function or structure of a tissue or organ or of an organism; sickness; malady; impaired health.
disjugal furrow
(ARTHROPODA: Chelicerata) Pertaining to the furrow separating the prosoma and opisthosoma of mites.
adj. [L. disjunctus, disunited] 1. Pertaining to separation of parts or formed into groups. 2. (ARTHROPODA: Insecta) Having the head, thorax and abdomen set off by ...
disjunct pallial line
(MOLLUSCA: Bivalvia) A pallial line broken up into unequal muscle attachments.
n. [L. disjunctus, disunited] Separation of daughter chromosomes during anaphase of mitosis and meiotic division.
n. [L. discus, circular plate] 1. Any flattened part in the form of a disc. 2. Circumoral area of many animals. 3. (ARTHROPODA: Insecta) In Coleoptera, the general dorsal ...
v.t. [L. dis, without; locus, place] To move out of its proper place, as when stria bands or lines are in discontinuity.
adj. [Gr. dis, twice; soma, body] Cells or individuals in the 2n condition; cells in the n+1 condition.
n. [L. dispergere, to disperse] 1. The act or result of scattering. 2. The scattering or distribution of organisms in the biosphere.
n. [OF. desplacier, to displace] An abnormal position of any part due to shifting from its normal position.
adj. [L. dis, away from; ponere, to place] Distributing, arranged or laid out.
v. [L. dissecare, to cut open] 1. To divide or separate into parts; to cut into pieces for examination. 2. To analyze, to examine.
n. [L. dis, away from; seminare, to sow] One who originates colonization.
(s) n.; n. pl. [L. dissaepire, to separate] 1. A partitioning wall; a septum. 2. (ARTHROPODA: Insecta) a. The septa of an embryo, separating the coelom-sacs. b. The ...
adj. [L. dissilire, to burst asunder] Bursting or springing open.
see catabolism.
n. [Gr. dissos, double; konche, shell] (MOLLUSCA) The shell of a second stage larva.
См. dissogony.
n. [Gr. dissos, double; genos, descent] (CTENOPHORA) A form of reproduction in an animal of sexual maturity in the larval stage and again as an adult.
see antisquama.
adv. [L. distare, to stand apart] Away from the body, or from point of attachment; toward the end farthest from the body.
n. pl. [L. distare, to stand apart; dentis, tooth] The dentes distad on the mandible.
adj. [L. distare, to stand apart] Pertaining to any part of a structure farthest from midline of the body or base of attachment; opposed to proximal.
distal bud
(BRYOZOA: Gymnolaemata) The bud arising from the distal side of the vertical wall of the parent zooid; see basal bud.
distal cell
(ARTHROPODA: Insecta) The cell bounded by the branches of the crossveins in a wing.
distal process
The peripheral process of a sensory nerve cell.
distal tubes
see marginal tubes.
n. pl. [L. distare, to stand apart] (ARTHROPODA: Insecta) The segments of an antenna excluding the scape and pedicel.
n. [Gr. distichos, of two rows] 1. Two vertical rows; two ranked. 2. (NEMATODA: Adenophorea) In Mermithida, the stichosome esophagus with a row of gland cells on either ...
distichous antennae
(ARTHROPODA: Insecta) Pectinate antennae with processes issuing from each joint and bending forward at acute angles.
n. [L. distare, to stand apart; proboscis, trunk] The enlarged distal portion of a proboscis.
n. [L. distare, to stand apart; stipes, stock] (ARTHROPODA) The distal part of the maxillary stipes.
n.; pl. -li [L. distare, to stand apart; Gr. stylos, pillar] (ARTHROPODA: Insecta) In Culicidae, the distal segment of the gonopods; clasp filament.
n. [Gr. dis, double; stoma, mouth] (PLATYHELMINTHES: Trematoda) A fluke with an oral and ventral sucker.
n. [L. distributus, allot, divide] Range of an organism or group of organisms in space and time.
ditaxic foot
(MOLLUSCA: Gastropoda) Foot of Pomatiasidae, divided by a transverse sulcus (groove-furrow) at about its anterior third.
see Bivalvia.
adj. [Gr. dis, twice; trochis, runner] (ARTHROPODA: Insecta) Pertaining to Hymenoptera having a two-segmented trochanter.
adj. [Gr. dia, through; ouron, urine] Pertaining to urine excretion in excess of the usual amount, directly referable to drinking, eating or certain metabolites.
adj. [L. diurnus, of the day] Pertaining to animals active only during the daytime; see nocturnal, crepuscular.
diurnal eyes
(ARTHROPODA: Chelicerata) In spiders, eyes that are dark in color.
diurnal rhythm
Having a 24 hour periodic cycle; see circadian.
adj. [L. divaricatus, spread apart] 1. Forked or divided into branches; diverging. 2. (MOLLUSCA: Bivalvia) Pertains to ornamentation consisting of widely divergent ...
n. [L. divaricatus, spread apart] 1. A muscle which causes parts to open. 2. (BRACHIOPODA) A muscle from the ventral valve to the cardinal process which opens the shell. 3. ...
adj. [L. diversus, different] Becoming more separated distally; extending in different directions from the same origin.
divergent adaptation
Adaptation to different kinds of environmental influence that results in a change from a common ancestral form.
adj. [L. diversus, different] Being distinct; differing in size or shape; dissimilar; separate.
n.; pl. -ula [L. devertere, to turn away] An outgrowth or pouch of some sort from the main axis of an organ.
adj. [L. dividere, to separate] Parted or disunited.
divided eyes
(ARTHROPODA: Insecta) 1. One in which the ommatidia in one area are different in size and often in pigmentation. 2. In many Odonata, the dorsal facets are nearly twice the ...
adj. [Gr. dis, two; xenos, guest] Parasitizing two host species; see monoxenous.
Deoxyribonucleic acid.
adj. [Gr. dokos, main beam; glossa, tongue] (MOLLUSCA: Gastropoda) Pertaining to the long radula containing a few strong teeth (up to 12) per transverse row; median ...
doersal border
1. (G.T.). 2. (ARTHROPODA: Crustacea) In Ostracoda, part of the valve outline, above or at the hinge line.
adj. [L. dolabra, ax; forma, shape] Hatchet-shaped.
n. pl. [Gr. dolichos, long; aster, star] (ARTHROPODA: Insecta) In Neuroptera larvae, modified setae on the lateral segmented processes of the dentate mandibles.
adj. [L. dolium, wine-cask; forma, shape] Barrel-shaped; globose; capacious.
См. doliioform.
doliolaria larva
(ECHINODERMATA: Crinoidea) A free-swimming bilaterally symmetrical larva of the crinoids and a post auricularia holothurian larva; characterized by possessing a large ...
Dollo's rule
The principle that evolution is irreversible, i.e., structures or functions once lost cannot be regained.
dome organ
A sensillium campaniformia.
dominant allele
An allele that determines the phenotype of a heterozygote; see recessive allele.
dominant character
A character from one parent that manifests itself in offspring to the exclusion of a contrasted (recessive) character from the other parent; see recessive character.
n. [L. dormire, to sleep] A period of inactivity or suspended animation usually referable to adverse environmental conditions, but can be genetically controlled.
adj. [L. dormire, to sleep] Being in a state of torpor or sleep, hibernating, quiescent or aestivating.
adv. [L. dorsum, back; ad, to] Toward the back or top.
adj. [L. dorsum, back] 1. Pertaining to the upper surface or back of the body. 2. (ARTHROPODA: Crustacea) In Ostracods in normal position, the upper part comprising the ...
dorsal area
1. (G.T.). 2. (ARTHROPODA: Crustacea) In Ostracoda, that part of the valve surface adjacent to the dorsal border, comprised of anterodorsal, mid-dorsal and posterodorsal ...
dorsal arms of the tentorium
(ARTHROPODA: Insecta) A pair of dorsal arms arising from the anterior arms; may be attached to the dorsal wall of the head by short muscles.
dorsal blastoderm
see serosa.
dorsal blood vessel
1. (ARTHROPODA: Insecta) The posterior heart and anterior aorta. 2. (ECHIURA) A dorsal tubular blood vessel in the anterior part of the body cavity often associated with ...
dorsal bristles
see dorsocentral bristles.
dorsal cardo
(ARTHROPODA: Crustacea) In Ostracoda, that portion of the peniferum that serves as a hinge by which it articulates with the zygum.
dorsal denticle
1. (G.T.). 2. (ARTHROPODA: Crustacea) In Ostracoda, a small, solid spinose projection on the dorsal margin; smaller than the dorsal spine.
dorsal diaphragm
(ARTHROPODA: Insecta) Muscular sheets of tissue extending from the ventral wall of the heart and vessels to the laterodorsal parts of the body wall, usually incomplete ...
dorsal foramen
(BRACHIOPODA) A posterior perforation of the cardial plate that may or may not encroach on the beak of the brachial valve.
dorsal gland orifice
1. The opening of any dorsal gland. 2. (ARTHROPODA: Insecta) In Diaspididae, disc pores and ducts for wax production on the surface of the pygidium.
dorsal hair tuft
see dorsal tuft.
dorsal lip
1. (G.T.). 2. (ARTHROPODA: Insecta) In Coccoidea, a chitinized plate supporting the anal tube.
dorsal margin
См. doersal border.
dorsal ocelli
(ARTHROPODA: Insecta) Simple eyes of adults, that vary in number from 2 to 3 in different orders.
dorsal organ
1. (ANNELIDA: Polychaeta) In Orbiniida and Spionida, ciliated sensory tubercles, ridges, or bands located on the dorsal surface of the segments; see lateral organs. 2. ...
dorsal ostioles
(ARTHROPODA: Insecta) In Pseudococcidae, the dorsal tranverse, slit-like openings on the pronotum and the sixth abdominal segment.

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