n. [Gr. auxein, to increase; trophe, nourishment]
Nutritionally dependent cells, individuals or strains whose growth depends on a specific nutrient in addition to their basic ...
adj. [Gr. a, without; L. vesicula, small bladder]
a. Referring to a genital system without seminal vesicles. b. Refers to a nephridium without a bladder.
adj. [L. dim. avis, bird]
n.; pl. -ria [L. dim. avis, bird]
An enlarged pedunculate operculum of polymorphs, resembling a bird\'s beak and more intricately reinforced than those of ordinary ...
adj. [L. dim. avis, bird; Gr. eidos, form]
Having winglike projections.
adj. [Gr. a, without; xenos, guest]
Without, or free from associated organisms; aseptic; see xenic, dixenic, monoxenic, polyxenic, trixenic.
adj. [L. axis, axle]
Of or pertaining to an axis; relative to the central axis of a cylindrical body or organ.
Central cells, comprised of a nucleus and germinal cells (axoblasts).
A type of skeletal organization with certain components condensed to form a dense central region or axis.
1. (ARTHROPODA: Insecta)
A protein core around which siliceous spicules are organized.
A dark elongated mass of spongy tissue extending along the length of the stone canal, forming part of the hemal system; sometimes called axial organ or ...
Gradation in metabolic rate along the three main body axes, anterior-posterior, dorsoventral and median- lateral.
n. [L. axilla, armpit]
The angle formed by junction of rays or straight-sided arms with no interbrachial arcs.
A main-axil arm and its branches, exclusive of terminal branchlets (omega-ramule).
n.; pl. axillae [L. axilla, armpit]
In Hymenoptera, a triangular or rounded sclerite on each side of the scutellum.
n. [L. axillaris, of an axil]
The second and third anal wing veins.
adj.; pl. -ies [L. axilla, armpit]
1. (ARTHROPODA: Insecta)
Pertaining to the axilla.
2. (ECHINODERMATA: Asteroidea)
In an axil, applied to a single ossicle.
A cell in the anal area of a wing.
The posterior edge of the articular membrane of a wing base.
In Hymenoptera, a notch in the hind wing that is at the distal end of the second anal furrow between the 2nd and 3rd anal veins.
In Diptera, an incision on the inner margin of a wing, distinguishing the alula from the main part.
One of the sclerites covering the base of a wing.
The membrane of the wing base extending from the tegula at the base of the costal margin to the axillary cord at the base of the anal area.
In Odonata, a large plate hinged to the tergum, supported by an arm from the pleural wing process.
That area of a wing base that contains the axillary sclerites.
Small plates between the notum and base of the wing, functioning in wing-flexing; sometimes called ossicles or pteralia.
A vein in the anal area of the hind wing.
n.; pl. axes [L. axis, axle]
A line of reference around, along or across where symmetry is established or gradients measured.
n. [Gr. axon, axle; blastos, bud]
Germinal cells of dicyemids that undergo cleavage and produce new individuals.
n. [Gr. axon, axle; koilos, hollow]
The first pair of coelomic sacs in an embryo, that open to the surface by the hydropore.
n. [Gr. axon, axle]
A long-unbranched or sparsely branched, nerve fiber, which usually conveys impulses away from the cell-body of its neuron.
n. [Gr. axon, axle; nema, thread]
The core of a cilium or flagellum, comprising microtubles; genoneme of a chromosome.
n. [Gr. axon, axle; plasma, formed or molded]
The cytoplasm or neuroplasm of an axis cylinder.
A geologic era embracing the first four or five billion years of earth history, antedating any record of organized life forms.
adj. [Gr. a, without; zone, belt]
Not restricted to a zone or locality.
adj. [F. azur, blue; Gr. philein, to love]
Having an affinity for staining with azure-eosin combinations; see eosinophil.
adj. [Gr. a, without; zygon, yoke; branchia, gills]
Pertaining to gills or ctenidia variously reduced on one side.
n. [Gr. a, without; zygon, yoke]
An unpaired appendage, structure or process; azygous, azygote adj..
adj. [L. bacca, berry]
Berry-like in appearance; bacciform.
adj. [L. bacillum, little stick]
Rod-shaped, or consisting of rod-shaped structures.
A modification of the hypodermis, consisting of glandular and nonglandular cells.
adj. [L. bacillum, little stick; forma, shape]
2. (ARTHROPODA: Insecta)
In certain male Diptera, refers to a pair of sclerites in the postabdomen joining the ...
n. [A.S. baec, the rear or dorsal part]
The dorsal or upper surface.
n. [Gr. bakterion, small rod; haima, blood]
The presence of bacteria in the hemolymph or blood of invertebrates, without production of harmful toxins or other deleterious ...
adj. [Gr. bakterion, small rod; phagein, to eat]
Feeding on bacteria.
adj. [L. baculum, stick or rod; forma, shape]
Appearing rod- or staff-like.
n. [L. baculum, stick or rod]
A straight shelled ammonite, extinct at the end of the Cretaceous Period.
n. [Gr. bainein, to walk; meros, part]
The leg-bearing thoracic segment.
n. [Gr. bainein, to walk; pous, foot]
The thoracic legs.
n. [Gr. bainein, to walk; soma, body]
In Aspidogastrea, the large, ventral sucker; see opisthaptor.
n. [F. baille, a bucket]
An exopod of the maxilla of crayfish and lobsters that functions in regulating the flow of water in the gill chamber; ...
Heterozygotes in which a gene mutation or chromosome structural change occurs that blocks normal development and is fatal before sexual maturity; see lethal factor.
A term describing a decrease in the overall fitness of a population due to the component genes that are maintained in the population because they add to fitness in different ...
A polymorphism maintained in the same breeding population by a selective superiority of the heterozygotes over either type of homozygotes; see transient polymorphism.
n. pl. [L. bis, two; lanx, plate, pan of a balance]
The halteres of Diptera.
adj. [Gr. balanos, acorn; eidos, like]
n. [Gr. balantidion, little bag]
Male and prostatic pores in segment xix.
In chironomid Diptera, a large RNA puff on chromosome IV of the salivary glands during larval development.
adj. [ME. balled, equivalent to ball, white spot]
Lacking specific hair or other surface covering.
The condition in which an organism can stay in a favorable environment, with modification of the phenotype by mutation and selection, until genetic assimilation has been ...
n. pl. [OHG. balla, a spherical body]
Four inflated areas in the cephalic region, immediately posterior to the lips, that form a collarette in ...
n. [OHG. balla, a spherical body]
Flying through the air on silken lines spun by spiders.
n. [A.S. bindan, band]
1. A transverse marking broader than a line.
2. (ARTHROPODA: Insecta)
a. In Diptera, the chromosome pairing of like chromomeres that produce the ...
n. [L. barba, beard]
1. Any spine or hair-like bristle with a process projecting obliquely or crosswise from the surface.
2. A spine with teeth pointing backward.
adj. [L. barba, beard]
Tufts or fascicles of hair or short bristles; bearded; having tufts of hair.
n.; pl. -lae [L. dim. barba, beard]
In Coleoptera, a tuft of hairs or short bristles at the sides of the abdomen near the anal region of scarabaeoid ...
n. [Sw. bark, rind]
The outer casing of spongin of those having discontinuous fiber structure.
n. [Gr. baros, weight; L. capere, to take]
An organ perceiving changes in pressure.
n. [Gr. baros, weight; tropein, to turn]
A response to pressure stimuli.
n. [OF. barre, bar]
An obstacle or obstruction that limits the spread or distribution of animals.
adv. [L. basis, base; ad, to]
Toward the base.
adj. [L. basis, base]
Pertaining to the base; near the point of attachment of a structure or appendage.
The bud arising from the basal wall of the parent zooid; see distal bud.
The circumoral lacuna of the lophophore into which the internal lacunae of all the tentacles open.
The diaphragm acting as the floor of the living chamber.
The encrusting proximalmost part of an ancestrula.
The posterior knobs of the oral stylet; see stylet knobs.
In Cirripedia, the lower edge of the scutum, tergum or other plates.
basal pigment cell
When present, a second sleeve of pigment cells that surrounds the proximal end of the retinulae; see corneal pigment cells, accessory pigment cells. ...
1. (ECHINODERMATA: Crinoidea)
A cycle of 5 aboral calyx plates in primitive stalked crinoids; see radial plates.
The circular base of the cephalic ...
In Cheilostomata, the multizooidal skeletal layers of the basal zooidal walls; basal plate.
The annular structure that extends posteriorly from the outer margin of the basal plate of the cephalic framework.
In Diptera, two lateral, vertical lamellae uniting ventrally to form a trough that lodges the pharynx.
In Isoptera, the line along which the wing separates from the body and shedding takes place.
In Cheilostomata, the subcentral, uncalcified section of an encrusting colony\'s exterior basal zooidal wall.
basal zooidal wall
In Stenolaemata and Gymnolaemata, the interior or exterior zooidal supporting wall, normally parallel to the orificial wall.
adj. [L. basis, base; ala, wing]
Pertaining to the sclerites below the wing base.
adj. [L. basis, base]
Pertaining to spicules protruding from the lower surface of a sponge.
n. [L. basis, base]
The main mandibular sclerite to which all other parts are joined.
n.; pl. bases [L. basis, base]
1. The bottom of anything.
2. The main ingredient in anything that is a fundamental element or constituent.
3. The portion of a body to which ...
1. The noncellular membrane underlying the epidermal cells of the body wall that separates it from the body cavity.
2. (ARTHROPODA: Insecta)
Applied also to the inner ...
In Cirripedia, the intersection of the basal and median dorsal margins of the dorsal plate (tergum).
n. [Gr. basis, base; keras, horn]
In Decapoda, the second segment of the antennal stalk of shrimp (Caridea) that bear flattened exopods.
Sensory organs in the form of short hairs or pegs projecting above the general surface.
n. [L. basis, base; costa, rib]
The basal part of the coxa, as indicated by the basicostal suture.
A strengthening ridge that indicates the external basal part of the coxa, the basicosta.
n. [L. basis, base; coxa, hip]
The narrow basal rim of the coxa.
In Acari, the suture in the basal segment of the femur, that separates the basiand telofemur of the leg.
n. [L. basis, base; femur, thigh]
In Acari, a segmental division of the femur, separated from the telofemur by the basifemoral ring.
adj. [L. basis, base]
Related to or situated at the base.
n. [L. basis, base; mandibulum, lower jaw]
In Orthoptera, a narrow sclerite between the mandible and gena; a trochantin.
n. [L. basis, base; maxilla, upper jaw]
The basal maxillary sclerite.
n. [Gr. basis, base; metrikos, of measuring]
The vertical or horizontal distribution of organisms at the seabottom.
n. [Gr. basis, base; onyma, name]
The name upon which new names of species or higher classifications has been based; see isonym.
In Cirripedia, the intersection of basal and occludent margins of the scutum.
n. [Gr. basis, base; ophthalmos, eye]
The proximal segment of the eyestalk, that articulates with the distal segment (podophthalmite) bearing the ...
n.; pl. -li [Gr. basis, base; peri, around; phallos, penis]
In Protura, the basal ring of the periphallus, into which the acroperiphallus is sometimes ...
n. [Gr. basis, base; pharynx, gullet]
The epipharynx and hypopharynx combined.
n. [Gr. basis, base; pous, foot]
1. (ARTHROPODA: Insecta)
The second segment of a telopodite; the first trochanter.
2. (ARTHROPODA: Crustacea)
n. [Gr. basis, base; proboskis, trunk]
In Diptera, the basal portion of the proboscis; the rostrum.
n. pl. [L. basis, base; pulvillus, small cushion]
In Diptera, the small lateral sclerite at the base of the pulvillus.
adj. [L. basis, base; rostrum, bill]
At the rostrum base.
n; pl. bases [L. basis, base]
1. A general term for the base of any appendage.
2. (ARTHROPODA: Crustacea)
a. A protopod segment adjoining the coxa and carrying the exopod ...
adj. [Gr. basis, base; skopein, to view]
Looking toward the base; see acroscopic.
Intersection of basal and scutal margins of the tergum in thoracic barnacles.
n. [L. basis, base; sternum, breastbone]
That part of a thoracic sternum anterior to the sternacostal suture and/or the sternal apophyses; ...
n. [Gr. basis, base; stylos, pillar]
1. In Diptera, the basal segment of the gonopods.
2. In Protura, the basal part of the stylus; see ...
A suture separating the basitarsus and telotarsus of the legs; mesotarsal ring.
A scissure separating the basitarsus and telotarsus of the leg.
n.; pl. -si [Gr. basis, base; tarsos, flat of the foot]
1. The proximal division of a tarsus; the metatarsus.
2. In Chelicerata, separated from the ...
Intersection of the basal and tergal margins of the scutum of thoracic barnacles.
In Apoidea, a small plate or scalelike projection at the base of the hind tibia.
Isorhizal nematocyst with spines at the base of the tube only.
n.; pl. -lae [L. basis, base; dim. valva, fold]
A small sclerite at the base of the first valvulae of the genitalia.
n. pl. [Gr. basis, base; pinax, tablet; kytos, container]
Cells that form the basal epithelium; in Corvomeyenia , a fresh-water sponge, they actively ingest ...
adj. [L. batata, sweet potato; forma, shape]
Resembling the shape of a sweet potato.
A form of deceptive mimicry in which a palatable species assumes the appearance of a species distasteful or poisonous to a predator; false warning color; allosematic color; ...
adj. [Gr. bathys, deep]
That zone over the continental slope to a depth of perhaps 2000 meters.
adj. [Gr. bathys, deep; limne, marsh]
Pertaining to or inhabiting the depths of fresh water lakes or marshes.
adj. [Gr. bathys, deep; metron, measure]
1. Pertaining to the science of measuring depths of oceans, seas or other large bodies of water.
2. Pertaining to the vertical or ...
One of the horizontal divisions of an ocean; one of the contour zones of the ocean or sea.
adj. [Gr. bathys, deep; pelagos, sea]
Living on or near the bottom in the depths of the ocean; see epipelagic, mesopelagic.
n.; pl. -ies [F. battre, to beat]
A group of nematocysts on the tentacles of hydras and some other hydroid polyps.
n. [uncertain origin]
A layer of propolis, or hard cerumen plus various other materials that enclose the nest cavity of a colony of stingless bees. ...
Batumen walls partitioning portions of a larger cavity from that utilized as a nest cavity by stingless bees.
n. [F. bave, drivel]
The double thread of fluid silk spun by caterpillars.
adj. [Gr. bdella, leech; eidos, form]
Being leech-like in appearance.
n. [A.S. gebed, prayer]
A rounded rib protuberance.
n. [OF. bec, beak]
1. Anything projecting and ending in a point.
a. In Chelicerata, the gnathosome of acarines. b. In Crustacea, the anteroventral projection ...
In Balanomorpha, the upper angle of the tergum formed into a long narrow point.
n. [L. barba, beard]
1. Any tuft of filaments on any part of an organism.
2. (ARTHROPODA: Insecta)
For Diptera, see mystax.
see byssus; bearded adj..
n. [F. bedeguar, Per. bad-awar, windbrought]
A cynipid gall of Rhodites rosae; a pin-cushion gall.
A series of movements performed by honeybees upon returning to the hive, that informs other bees of the location of the food source.
Small, flattened, apterous dipteran flies that are commensal with honeybees, often epizoic on the workers or queens.
n. (ARTHROPODA: Insecta)
A bitter pollen stored by bees in the honeycomb that when mixed with honey is used for food by larvae and newly-emerged workers; cerago; see ...
n. pl. [A.S. beo, bee]
The flower-visiting, social or solitary, aculeate hymenopterous insects belonging to the superfamily Apoidea.
n. [A.S. beo, bee; weax, wax]
A wax secreted by glands on the ventral surface of the abdomen of worker bees that is used in the construction of ...
adj. [Gr. belemnon, javelin; eidos, form]
Dartlike in shape.
n. [A.S. belle, bell]
1. Any bell-shaped structure.
a. In Hydrozoa, the umbrella of jellyfish. b. In Scyphozoa, the nectophores of siphonophores.
adj. [Gr. belone, needle; eidos, form]
Needle-like in shape.
adj. [Gr. benthos, depths of sea]
Pertaining to the seabottom; maybe extended to include some of the benthic animals: crabs, snails, starfish, certain worms, clams, sponges, ...
adj. [Gr. benthos, depths; potamos, river]
Pertaining to organisms or plants living on the bottom of a river or stream.
The principal that the average body size is geographically variable in that the animals are larger in the cooler climates of the range of a species.
n. [A.S. berie, berry]
An egg of certain Decapoda.
adj. [A.S. besma, broom; L. forma, shape]
n. [Gr. beta]
The second letter of the Greek alphabet ( ) used to designate the second in a series, as -chlorophyll and -chlorophyll.
A level of taxonomy involving the arrangment of species into a natural system of lower and higher taxa; see alpha taxonomy, gamma taxonomy.
adj. [L. bis, two; alatus, winged]
adj. [L. bis, two; angulus, corner, bend]
Having two angles or double keeled.
adj. [L. bis, two; arcuatus, bent like a bow]
adj. [L. bis, two; areolatus, small places]
Two celled, or having two areolae; see bilocular.
adj. [L. bis, two; dim. artus, joint]
Having two joints; diarticular.
adj. [L. bis, two; axis, axle]
Having two axes.
adj. [L. bis, two; canalis, a channel]
Having two channels or grooves.
adj. [L. bis, two; carina, keel]
Having two carinae or keel-like projections.
adj. [L. bis, two; cauda, tail]
Possessing two tails or anal processes.
adj. [L. bis, two; cellula, little cell]
Composed of two cells.
adj. [L. bis, two; cilium, eyelash]
Furnished with two cilia, flagella, or elaters.
adj. [L. bis, two; concavus, hollow or arched inward]
Being concave on both sides; amphicoelous; see amphicyrtic.
adj. [L. bis, two; Gr. konos, cone]
Being formed as two cones placed base to base.
adj. [L. bis, two; convexus, arched outward]
Being convex on opposite sides; lens-shaped; see amphicyrtic, amphicoelous.
adj. [L. bis, two; cornu, horn]
Bearing two horns; crescentlike.
adj. [L. bis, two; cornutus, horned]
Having two horns or cephalic processes.
A uterus in which both uteri are fused, but have short lateral extensions.
adj. [L. bis, two; cuspidatus, pointed]
Being double pointed; having two cusps or points.
n. [L. bis, two; Gr. daktylos, finger]
An appendage, ambulacrum, apotele, or claw with two lateral ungues; see monodactyl, tridactyl.
n. [L. bis, two; deficare, to be wanting]
A form of phanerotaxy, exhibited by the absence of two of the elements typically present in a particular organism; see holotaxy.
adj. [L. bis, two; dens, tooth]
Having two teeth.
adj. [L. bis, two; dim. dens, tooth]
Having two small teeth or tooth-like processes.
adj. [L. bis, two; Gr. desmos, bond]
Pertaining to two tendons attached at the base of the distal segment of an appendage; a eudesmatic articulation.
adj. [L. bis, two; Gr. diskos, circular plate; eidos, form]
Having two disc-shaped parts.
adj. [L. bis, two; devertere, to turn away]
Having two diverticula.
adj. [L. bis, two; emarginatus, notched at the apex]
Having two notches on the border or edge.
adj. [L. bis, two; annus, year]
Occurring once every two years.
adj. [L. bis, two; facies, face]
Having opposite surfaces alike.
adj. [L. bis, two; fariam, in rows]
Being arranged in 2 rows, on either side of an axis; being oriented or pointed in opposite directions.
adj. [L. bis, two; fascia, band]
With two broad well defined bands or fascia.
adj. [L. bis, two; fenestra, window]
A term used to describe heteroderid fenestra divided by a broad vulval bridge so that it appears to be two ...
adj. [L. bis, two; findere, to split]
Divided into two branches, arms, or prongs, or into two equal parts by a cleft; separated down the middle by a slit; divided by a ...
adj. [L. bis, two; filum, thread]
Having two filaments, threads, or fibers.
adj. [L. bis, two; flabellum, fan]
Twice fabellate; a form of antenna with each side of the joints having long flattened processes.
adj. [L. bis, two; flagellum, whip]
Having two flagella; dikont.
adj. [L. bis, two; flectere, to bend]
Bending in two directions.
An erect colony formed by two layers of zooids budding back to back from the interior multizooidal median wall.
adj. [L. bis, two; folliculus, small sac]
Having two follicles.
adj. [L. bis, two; forare, to bore]
Having two perforations.
adj. [L. bis, two; forma, form]
Having two forms, or combining characteristics of two forms.
n. [L. bis, two; forma, form]
A carapace that reflects sexual dimorphism in differing valve proportions for each sex of the same species.
An immature\'s spiracle having two entrances (air tubes); annular-biforous spiracles.
adj. [L. bis, two; furca, fork]
Divided into two branches, stems or knobs; two pronged.
adj. [L. bis, two; geminus, twin]
n. [L. bis, two; genus, kind]
A bigeneric hybrid.
adj. [L. bis, two; genus, kind]
Pertaining to hybrids between species of different genera.
adj. [L. bis, two; gigerium, entrail]
Having two gizzards.
adj. [L. bis, two; gutta, drop, spot]
Having two droplike spots.
adj. [L. bis, two; jugum, yolk]
Being yoked two together; two-paired.
An elongate or annular spiracle of certain larvae with a pair of projecting lips interior to the peritreme; one having two lips at the slit-like ...
adj. [L. bis, two; lamella, plate]
Having two lamellae or plates; two-lipped.
adj. [L. bis, two; lamina, thin plate]
Consisting of two lamina or thin plates; diploblastic.
A cheilostomate colony with erect branches comprised of two layers of zooids, each with separate, but common exterior basal walls.
A former division of the animal kingdom containing all those forms that show bilateral symmetry.
adj. [L. bis, two; latus, side]
Having two equal or symmetrical sides.
Symmetry such that a body or part can be divided through the longitudinal axis by one mediosagittal plane into equivalent right and left halves, each for all practical ...
adj. [L. bis, two; lineatus, of a line]
Of or pertaining to two lines; marked with two lines.
adj. [L. bis, two; lobus, rounded projection]
Having two lobes.
adj. [L. bis, two; loculus, compartment]
Divided into two cells, chambers, compartments or loculi.
adj. [L. bis, two; macula, spot]
Marked with two spots or stains.
adj. [L. bis, two; margo, border]
Having two margins.
Zoarium or zooecium composed of layers of calcite and others of aragonite.
adj. [L. bis, two; musculus, muscle]
Having two muscles.
adj. [L. binarius, from bini, pair]
1. Composed of two units, elements or parts.
2. Refers to designations of two kinds of names; see binominal nomenclature.
A form of asexual reproduction in which a cell, or organism divides into approximately equal parts; see transverse fission.
adj. [L. bini, pair]
Doubled; growing in pairs.
adj. [L. bis, two; nervus, nerve]
Having two nerves or veins.