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(muscles) adductor coxae
(ARTHROPODA: Insecta) The second muscle of the coxa.
a posteriori weighting
The weighting of taxonomic characters on the basis of their proved contribution to the establishment of sound classifications; see a priori weighting.
a priori weighting
The weighting of taxonomic characters on the basis of preconceived criteria; see a posteriori weighting.
That zone of the sarcomere composed of both actin and myosin filaments.
Any of the chromosomes of the normal chromosome complement, as opposed to the B-chromosomes.
see A-band.
adj. [L. ab, from; Gr. aktis, ray] (ECHINODERMATA) Of or pertaining to the area of the body without tube feet that normally does not include the madreporite; not situated on ...
see abactinal.
adj. [L. ab, from; apertura, an opening] (MOLLUSCA: Gastropoda) Refers to being away from any shell aperture.
adj. [L. ab, from; axis, axle] Refers to being situated outside of or directed away from the axis or central line; see adaxial.
abbreviate fascia
(ARTHROPODA: Insecta) A fascia extending less than half the wing.
adj. [L. ab, from; caulis, stalk] (CNIDARIA: Hydrozoa) Pertaining to polyps that extend outwards from the common stem; see adcauline.
n. [L. abdomen, belly] 1. (ARTHROPODA) The posterior of the three main body divisions of insects; not homologous with chelicerate opisthosoma. 2. (ARTHROPODA: Crustacea) ...
n. [L. abdomen, belly; Gr. meros, part] An abdominal segment.
abdominal feet
see prolegs.
abdominal ganglia
(ARTHROPODA) Ganglia of the ventral nerve cord that innervate the abdomen, each giving off a pair of principal nerves to the muscles of the segment; located between the ...
abdominal process
(ARTHROPODA: Crustacea) In Branchiopoda, fingerlike projections on the dorsal surface of the abdomen.
abdominal somite
(ARTHROPODA: Crustacea) Any single division of the body between the thorax and telson; a pleomere; a pleonite.
v. [L. abducere, to lead away] To draw or conduct away.
v. [L. abducere, to lead away] To draw away from position of median plane or axis.
n. [L. abducere, to lead away] (MOLLUSCA: Bivalvia) Rubber- like block of protein of the inner hinge ligament of Pecten.
abductor muscle
The muscle that draws an appendage or part away from an axis of the body; see adductor muscle.
adj. [L. aberrans, wandering] Pertaining to a deviation from the normal type or form; abnormal; anomalous variations; different.
adj. [L. abire, to depart] Avoiding or turning away from a source of stimulation; see adient.
n. [Gr. a, without; bios, life; koinos, common] The non-living components of an environment.
n. [Gr. a, without; bios, life; genesis, beginning] The theoretical concept that life can arise from non-living matter; spontaneous generation; archebiosis; archegenesis, ...
n. [Gr. a, without; bios, life; logos, discourse] The study of inanimate objects; anorganology.
adj. [Gr. a, without; bios, life] Pertaining to, or characterized by the absence of life.
abjugal furrow
(ARTHROPODA: Chelicerata) In Acari, the line separating the aspidosoma (prodorsum) and the podosoma of mites.
n. [L. ablatus, taken away] Removal of a part as by excision or amputation.
adj. [L. ab, from; os, mouth] 1. Pertaining to, or situated away from the mouth; surface opposite the mouth. 2. (ECHINODERMATA: Asteroidea) The surface opposite that bearing ...
adj. [L. aborigineus, ancestral] 1. Of or pertaining to an aborigine, the first, original. 2. Native fauna and flora of a geographic region.
n. [L. abortus, premature birth] Arrest or failure of development of any entity or normally present part or organ rendering it unfit for normal function.
adj. [Gr. a, without; branchia, gills] Pertains to being without gills.
n. [L. ab, from; reptere, to crawl] (ARTHROPODA: Crustacea) The postabdomen of water fleas terminating in two claws.
n. [L. abscissus, cut off] Cut off squarely; with a straight margin.
n. [L. abscissus, cut off] The separation of parts.
adj. [L. absolutus, finished, perfect, complete] Any entity existing in and of itself free from impurities or imperfections.
n. [L. ab, from; sorbere, to suck] The passage of water and dissolved substances into a living cell or tissue; see adsorption.
adj. [L. ab, from; terminus, limit] Passing from the end toward the center.
adj. [Gr. a, without; L. bulla, bubble] Lacking a bulla.
n. [Gr. abyssos, the deep sea] Bottomless, sometimes used to denote very deep.
adj. [Gr. abyssos, the deep sea] Pertaining to the ocean depth beyond the continental shelf; dark area of the ocean below 2,000 meters.
adj. [Gr. abyssos, the deep sea; benthos, depth of sea] Pertaining to all organsims that are sessile, or creep or crawl over the ocean bottom.
adj. [Gr. abyssos, the deep sea; pelagos, sea] Pertains to all organisms inhabiting the deep abyssal zone; they are either active swimmers, or float with the current.
n. [Gr. akantha, thorn, spine] Spinous process; prickle.
adj. [Gr. akantha, thorn, spine] Pertaining to being armed with spines or prickles.
acanthella larva
(ACANTHOCEPHALA) Transitional larva developed from an acanthor after crossing through the gut wall into the intermediate host hemocoel; stage between an acanthor and a ...
[Gr. akantha, thorn, spine] A prefix meaning spine.
См. acanthocephalans.
n.; n. pl. [Gr. akantha, thorn, spine; kephale, head] A phylum of parasitic pseudocoelomate, bilateral animals distinguished by a generally eversible proboscis with ...
n. [Gr. akantha, thorn, spine; kystis, bladder] (NEMERTEA) The stylet apparatus housed in the middle (stylet bulb) portion of the proboscis, including two to several ...
n.; pl. -dia [Gr. dim. akanthodes, thorn, spine] (ARTHROPODA: Chelicerata) In Acari, a tarsal seta that contains an extension of a sensory basal cell.
acanthodrilin set
(ANNELIDA: Oligochaeta) With reference to male terminalia, having prostatic pores in segments xvii and xix, and male pores in segment xviii, all pores are in seminal furrows.
n.; pl. -iae [Gr. akantha, thorn, spine; pareion, cheek] (ARTHROPODA: Insecta) In Coleoptera, the lateral spiny paired region of the paria (epipharynx) in scarabaeoid ...
n. [Gr. akantha, thorn, spine; phoreus, bearer] (NEMERTEA) A conical mass that forms the basis of the median stylet.
n. [Gr. akantha, thorn, spine; phoreus, bearer] (ARTHROPODA: Insecta) In Diptera, spine bearing plates at the tip of the female abdomen used to aid oviposition in soil. ...
n. [Gr. akantha, thorn, spine; pous, foot] (ARTHROPODA: Crustacea) A barnacle appendage (cirrus) bearing a short row of strong sharp spines distally at each articulation of ...
n. [Gr. akantha, thorn, spine; poros, passage] (BRYOZOA) 1. A tubular spine in certain fossils. 2. In Stenolaemata, sometimes referred to as style, stylet, or ...
n. [Gr. akantha, thorn, spine] (ACANTHOCEPHALA) The first stage larva that emerges from the egg; the infective stage in the gut of the arthropod (intermediate host); has 6-8 ...
n. [Gr. akantha, thorn, spine; A.S. rod] (BRYOZOA: Stenolaemata) A style or stylet; see acanthopore.
n. [Gr. akantha, thorn, spine; soma, body] (ARTHROPODA: Crustacea) In Decapoda, the last larval stage preceding the postlarva; zoea; mysis; schizopod larvae.
adj. [Gr. akantha, thorn, spine; sphen, wedge] (ECHINODERMATA: Echinoidea) Pertaining to a spine composed of solid wedges separated by porous tissue.
adj. [Gr. akantha, thorn, spine; stegos, roof] (BRYOZOA) Pertaining to an overlay of spines, as the ovicell.
n. [Gr. akantha, thorn, spine; stylos, pillar] 1. (BRYOZOA: Stenolaemata) A type of stylet with a smooth rod core of nonlaminated calcite, with sheath laminae usually ...
n. [Gr. akantha, thorn, spine; zoon, animal; eidos, form] (BRYOZOA) A specialized zooid that secretes small tubules that project as spines above the colony\'s surface.
n. [Gr. akari, mite or tick] (ARTHROPODA: Chelicerata) Subclass of the most diverse and species-rich group of arachnids containing the mites and ticks; formerly the order ...
n. [Gr. akari, mite or tick; -iasis, diseased condition] (ARTHROPODA: Chelicerata) Infestation with ticks or mites, or any diseased condition resulting therefrom.
see Acari.
n.; pl. -aria [Gr. akari, mite or tick; L. -arium, place for] 1. (ARTHROPODA: Chelicerata) Any surface or anatomical feature, enclosed or not, internal or external, that ...
n.; pl. -ia [L. akari, mite or tick; Gr. kekis, gallnut] (ARTHROPODA: Chelicerata) Any plant gall caused by a mite.
n. [Gr. akari, mite or tick; logos, discourse] That branch of zoology that studies mites and ticks.
n. [Gr. akari, mite or tick; philos, loving] Symbiosis of mites and plants.
n. [Gr. a, without; karyon, nut] 1. Lacking a nucleus. 2. A non-nucleated cell.
См. acaudate.
adj. [Gr. a, without; L. cauda, tail] Without a tail.
n. [L. acceleratare, to hasten to] The speeding up of a development so that a feature appears earlier in the ontogeny of a descendant than in an ancestor.
n. [L. ad, to; canere, to sing] Intensify; increase distinctness.
adj.; pl. -ries [L. ad, to; cedere, move] Contributing to the effectiveness of a principal design; secondary; supplemental.
accessory appendages
(ARTHROPODA: Insecta) In Odonata, the genital appendages (intromittent organs) on the venter of the second and third abdominal segment.
accessory body
Argyrophil particles obtained from Golgi bodies in spermatocytes; see chromatoid body.
accessory boring organ
(MOLLUSCA: Gastropoda) A glandular structure (in naticaceans on the lower lip, and in muriaceans sole of the foot) that aid the radular rasping process by acidic ...
accessory cell
(ARTHROPODA: Insecta) A cell in the wing not normally present in the group, or definite location.
accessory chromosomes
См. extra chromosomes.
accessory circulating organs
see accessory pulsatile organs.
accessory claws
(ARTHROPODA: Chelicerata) In Araneae, clawlike bundles of setae or bristles below the true claws.
accessory genitalia
see accessory appendages.
accessory glands
(ARTHROPODA: Insecta) 1. A pair of glands opening primarily on the venter or the eighth or ninth abdominal segment of females that secrete an adhesive substance or material ...
accessory lamellae
(MOLLUSCA: Bivalvia) In Pholadinae, accessory periostracal coverings or shelly plates along the dorsal margin, over the anteroventral pedal gape, or along the ...
accessory lobes
(ARTHROPODA) Ventral lobes of the protocerebrum.
accessory nidamental gland
(MOLLUSCA: Cephalopoda) Small paired glands subordinate to the nidamental gland.
accessory pigment cells
(ARTHROPODA: Insecta) As many as twenty-four cells that surround the retinulae of a compound eye; in superposition eyes the pigment granules assume different positions in ...
accessory pulsatile organs
(ARTHROPODA) Pulsating structures connected with the hemocoel that are concerned with maintaining a circulation through the appendages, but pulsating independently from the ...
accessory sac
(PLATYHELMINTHES: Cestoda) A sac in the proglottid wall that opens into the genital atrium.
accessory spicule
(PORIFERA) A category of megasclere, supplemental to the primary skeleton, may be located anywhere.
accessory stylets
(NEMERTEA) Replacement stylets that are stored in reserve stylet sacs or pouches.
accessory subcoastal vein
(ARTHROPODA: Insecta) In Perlidae, the vein given off from the subcosta, branching toward the apex of the wing.
accessory testis
(ARTHROPODA: Insecta) In Coleoptera, the coiled middle section of the vas deferens serving as a reservoir for mature sperm.
accidental evolution
A condition that occurs as a consequence of mutation, but does not appear to improve survival value.
accidental host
A host in which a pathogenic parasite is not commonly found.
accidental myiasis
(ARTHROPODA: Insecta) In Diptera, the presence within a host of a fly larva that is not normally parasitic; pseudomyiasis.
accidental parasite
A parasite in other than its normal host; an incidental parasite.
accidental transport
Unintentional movement of a pathogen from one location to another by an animal not normally associated with the parasite or disease; see phoresis.
n. [L. ad, to; Gr. klima, climate] The habituation of an organism to a foreign or different climate or environment; acclimatization.
adj. [L. acclivis, ascending] Pertaining to an upward slope; see declivous.
n. [L. accrescere, to increase] Growth or increase by external addition; see intussusception.
adj. [Gr. a, without; koilos, hollow] Refers to any Metazoa with no internal cavities in the body other than the lumen of the gut; acoelous adj..
adj. [Gr. a, without; kentrol, center] Pertaining to not being centered; lacking a centromere when referring to a chromosome or chromosome fragment.
acentric inversion
An inversion of any part of the chromosome not involving the centromere.
(MOLLUSCA) Former name for Class Bivalvia.
n. [Gr. a, without; kephale, head; kystis, bladder] (PLATYHELMINTHES: Cestoda) A hydatid larval stage; bladderworm; cysticercus.
adj. [Gr. a, without; kephale, head] (ARTHROPODA: Insecta) Pertains to the absence of any structure comparable to a head, as in certain dipteran larvae; acephalic; see ...
n. [Gr. a, without; keratos, horn] 1. Without true antennae. 2. (ARTHROPODA) In former classifications, the name Acerata comprised a class combining Merostomata and ...
adj. [L. acer, sharp] Of or pertaining to needle-shaped; acerose; acicular.
adj. [L. acer, sharp] Having a sharp, rigid point; acerate; acicular.
adj. [Gr. a, without; keras, horn] Lacking horns, antennae or tentacles.
adj. [L. acervare, to heap] Pertaining to heaped or growing in heaps or clusters; see coacervate.
adj. [L. acervare, to heap] Resembling small heaps.
n. [L. acesceres, to turn sour] Acetic acid fermentation.
acetabular caps
(ARTHROPODA: Insecta) The coxal cavity of Hemiptera.
adj. [L. acetabulum, cup; forma, shape] Resembling the shape of a shallow cup or saucer.
n.; pl. -la [L. acetabulum, cup] 1. A cup-shaped socket or cavity. 2. (ANNELIDA: Hirudinoidea) In leeches, the large posterior sucker. 3. (ARTHROPODA: Chelicerata) In ...
См. achetous.
См. achatinus.
adj. [L. achates, agate] Pertaining to lines resembling those of an agate; in bands of more or less concentric circles.
adj. [Gr. a, without; chele, claw] Lacking pincherlike organs or claws.
adj. [Gr. a, without; chaite, hair] Without setae, bristles, or chaetae.
adj. [Gr. a, without; cheilos, lip] Lacking a lip.
adj. [Gr. a, without; chlamys, mantle] Lacking a mantle.
n. [Gr. a, without; chroa, colored; kytos, container] A colorless cell; a lymphocyte.
n. [Gr. a, without; chroa, colored; L. globus, sphere] (MOLLUSCA) A colorless respiratory pigment.
see achroous.
См. achromasie.
n. [Gr. a, without; chroma, color] Lacking the usual reaction to stains; see chromasia.
adj. [Gr. a, without; chroma, color] Being achroous; stains not permeating readily; uncolored.
achromatic apparatus
См. acromatic figure.
n. [Gr. a, without; chroma, color] Those parts of the cell nucleus that do not absorb color of the basic stains.
a; see chromatin.
adj. [Gr. a, without; chroma, color] Free from color; unpigmented.
adj. [Gr. a, without; chros, complexion] Colorless; unpigmented; achromatic.
n. [L. acia, thread] (ARTHROPODA: Insecta) A thin cuticular plate of the mandible.
n. [L. dim. acus, needle] (ARTHROPODA: Crustacea) A thornshaped scaphocerite of hermit crabs.
n.; pl. -lae [L. dim. acus, needle] A slender needle-like process; a spine or bristle; something larger than a seta or chaeta; acicular, aciculate adj..
see acicula.
n.; pl. -lums, -la [L. dim. acus, needle] (ANNELIDA: Polychaeta) A chitinous stiff basal seta or rod supporting the parapodial lobes.
acid gland
См. poison gland.
adj. [L. acere, to be sour] Acid forming; having the properties of an acid.
adj. [L. acere, to be sour; Gr. bion, life] Living in an acid environment; see oxyphilic.
adj. [L. acere, to be sour; Gr. philein, to love] Growing in an acid media; see oxyphilic.
См. acidophilous.
adj. [L. acidus, sour; Gr. philein, to love] 1. Tolerating acid; aciduric. 2. Staining readily in an acid stain.
adj. [L. acere, to be sour; Gr. phobos, fear] Pertaining to the intolerance of an acid environment; oxyphobic.
n. [L. acere, to be sour; Gr. theke, case] (ARTHROPODA: Insecta) The pupal sheath of the ovipositor.
adj. [L. acere, to be sour; durus, hardy] Tolerating an acid medium; see acidophilic.
n. [L. acies, sharp edge or point] (ARTHROPODA: Insecta) The extreme termination of a margin.
adj. [L. acus, needle; forma, shape] Pertaining to being shaped like a needle; acicular.
adj. [L. acinaces, short sword; forma, shape] Scimitar-shaped; having one edge thick and slightly concave, the other thin and convex; curved and growing wider toward a curve ...
См. acinacicate.
adj. [L. acinarius, pert. to grapes] Having globose vesicles resembling grape seeds.
adj. [L. acinus, berry or grape; forma, shape] Resembling a cluster of berries; having small kernels like grapes.
n.; pl. -ini [L. acinus, berry or grape] A small sac or alveolus in a multicellular gland or lung; acinose adj..
aclid organ
(ACANTHOCEPHALA) A spined invagination located at the anterior end of an acanthor; sometimes referred to as a rostellum.
see orthocline.
adj. [L. a, without; clitella, packsaddle] (ANNELIDA: Oligochaeta) Lacking a clitellum; an adult earthworm, but still without a clitellar tumescence of the epidermis; the ...
n. [Gr. akme, point] 1. The highest point. 2. That period of greatest development in the phylogenetic history of a group of organisms.
acone eye
(ARTHROPODA: Insecta) A condition (possibly primitive) of a compound eye in which the ommatidium is lacking a crystalline cone, but is modified in the form of elongated ...
n. pl. [Gr. akon, dart; eidos, shape] (CNIDARIA: Anthozoa) Simple or branched adhesive threads of tube anemones situated on the lower portion of the mesenteries.
n.; pl. -ia [Gr. akon, dart; ium, nature of] (CNIDARIA: Anthozoa) An elongate, hollow, nematocyst-studded thread of sea anemones.
adj. [Gr. akouein, to hear] Auditory; pertaining to the organs or sense of hearing, or produce sound such as a stridulatory organ. acquired adj. [L. acquirere, to seek] 1. ...
acquired character
A trait or somatic modification that originates during the life of an organism as the result of an environmental or functional cause.
n. [Gr. akrasia, bad mixture] (ARTHROPODA: Insecta) In Lepidoptera, a secretion of certain butterflies of protective or distasteful function.
n. [Gr. akraspedos, without fringes] (CNIDARIA: Hydrozoa) In former classifications, a group of jellyfish having a medusa without a velum.
adj. [Gr. a, without; kraspedon, border] 1. (CNIDARIA: Hydrozoa) Refers to medusae without a velum. 2. (PLATYHELMINTHES: Cestoda) Pertaining to tapeworm segments that do ...
acrembolic proboscis
(MOLLUSCA) Having a completely invaginable proboscis; see pleurembolic proboscis.
n. [Gr. akridion, locust, grasshopper; phagein, to eat] (ARTHROPODA: Insecta) The act of preying and feeding on members of the Acrididea.
n. [Gr. akros, tip; blastos, bud] In spermatogenesis, Golgi material giving rise to an acrosome.
adj. [Gr. akros, tip; kentron, center] Pertaining to chromosomes with the centromere at or near one of the ends; rod-shaped chromosomes; see telocentric.
see cercus.
n. [Gr. akros, tip; kystis, sac] (CNIDARIA: Hydrozoa) A chitinous sac containing a planula in which development is completed; may protrude from the gonangium.
adj. [Gr. akros, tip; dendron, tree; philein, to love] Inhabiting the tree-tops.
acromatic figure
Pertaining to mitosis, those structures (spindle fibers and cell centers) that do not stain readily.
n. [Gr. akros, tip] 1. (ARTHROPODA) The anterior unsegmented, or indistinguishably fused, body segments. adj. In Crustacea, ophthalmic somite; presegmental region. b. In ...
adj. [Gr. akros, tip; nema, thread] Referring to smooth, whip-like flagella.
n. [Gr. akros, tip; nema, thread] The slender section of a flagellum.
n.; pl. -ae [Gr. akros, tip; pareion, cheek] (ARTHROPODA: Insecta) In Coleoptera, the anterior part of the paria bearing the bristles of scarabaeoid larvae.
n.; pl. -li [Gr. akros, tip; peri, around; phalos, penis] (ARTHROPODA: Insecta) In Protura, the distal part of the periphallus, sometimes retractable into basiperiphallus.
adj. [Gr. akros, tip; philein, to love] Preferring regions of high altitude.
n.; pl. -gi [Gr. akros, tip; rhax, berry] (CNIDARIA: Anthozoa) A marginal tubercle of sea anemones containing specialized nematocysts.
adj. [Gr. akros, tip; skopein, to view] Looking towards the apex; see basiscopic.
n. [Gr. akros, tip; soma, body] A cap-like structure investing the front part of the sperm head allowing penetration of the cover of the egg cell; formed from Golgi ...
n. [Gr. akros, tip; sternon, chest] (ARTHROPODA: Insecta) That part of the narrow marginal flange anterior to the antecosta of a definitive sternal plate, including the ...
see acrostichal area, bristles, scales.
acrostichal area
(ARTHROPODA: Insecta) In Diptera, the median longitudinal area of the scutum between the anterior promontory and prescutellar area, bearing bristles or scales.
acrostichal bristles
(ARTHROPODA: Insecta) In Diptera, setae occurring in a median longitudinal row on the acrostichal area of the scutum.
acrostichal hairs
См. acrostichal setulae.
acrostichal scales
(ARTHROPODA: Insecta) In Diptera, scales occurring in one or two lines on the acrostichal area.
acrostichal seta
См. acrostichal setulae.
acrostichal setulae
see acrostichal bristles.
n. [Gr. akros, tip; syndesai, to bind together] Incomplete end-to-end pairing of two chromosomes during meiosis; telosyndesis.
n. [Gr. akros, tip; L. tergum, back] (ARTHROPODA: Insecta) The anterior precostal part of the tergal plate of a secondary segment usually in the form of a narrow flange, ...
adj. [Gr. akros, tip; -terion, place for] Relating to or affecting the extremities.
n. [Gr. akros, tip; trochos, hoop] (ANNELIDA: Polychaeta) The band of cilia anterior to the prototroch (preoral band) of a larval stage.
acrotrophic ovariole
see telotrophic ovariole.
adj. [Gr. akridion, locust, grasshopper] (ARTHROPODA: Insecta) Pertaining to grasshoppers or grasshopper-like.
n. [Gr. actus, move] A muscle protein that combines with myosin to form a contractile protein complex, actomyosin; the chief constitutent of the I and Z-band myofilaments of ...
adj. [Gr. aktis, ray] 1. Star-shaped; pertaining to that area of a radiate organism from which arms or tentacles radiate. 2. (CNIDARIA: Anthozoa) Oral area of sea ...
n. [Gr. aktis, ray] (PORIFERA) The single ray of a starshaped spicule.
adj. [Gr. aktis, ray; en, in; chyma, to pour] Cellular tissue resembling a star.
adj. [Gr. aktis, ray] Pertaining to wave lengths between those of visible violet and X-rays, having certain chemical effects.
adj. [Gr. aktis, ray; forma, shape] Having a radiated form; star-shaped; actinoid adj..
n. [Gr. aktis, ray; bios, life; logos, discourse] The study of effects of radiation upon living organisms.
n. [Gr. aktis, ray; blastos, bud] (PORIFERA) The rudimentary cell of a spicule.
n. [Gr. aktis, ray; chiton, tunic] Chitin that is anisotropic or birefringent (double refracting).
adj. [Gr. aktis, ray; odous, tooth] (MOLLUSCA: Bivalvia) With teeth radiating from the beak of the shell.
adj. [Gr. aktis, ray; gonos, seed] Having genitalia arranged in a radial pattern.
adj. [Gr. aktis, ray; eidos, shape] Raylike; star-shaped; stellate; actiniform adj..
n. [Gr. aktis, ray; logos, discourse] 1. The study of radially symmetrical animals. 2. The study of the activity of radiation.
n. [Gr. aktis, ray; meros, part] A segment of a radially segmented organism.
n. [Gr. aktis, ray; pharynx, gullet] (CNIDARIA: Anthozoa) Gullet of the sea anemone.
n. [Gr. aktis, ray; stoma, mouth] The mouth of a radially symmetrical animal.
n. [Gr. aktis, ray; trochos, wheel] (PHORONIDA) A free-swimming, elongate, ciliated larva of the phylum Phoronida, bearing tentacles attached to a girdle immediately ...
См. actinotroch.
n. [Gr. dim. aktis, ray] (CNIDARIA: Hydrozoa) A larval stage that looks like either a polyp or medusa, depending upon whether the mouth is turned upward or downward.
action current
The flow of electric current between a region of excitation and neighboring unexcited regions.
action potential
A temporary change in potential that occurs across the surface membrane of a muscle or nerve cell following stimulation.
n. [L. agere, to act] Any substance that renders another substance active.
adj. [L. agere, to act] Pertaining to movement; given to action; alert.
active center
The site on an enzyme molecule that interacts with the substrate molecules; where activation and reaction take place.
active transport
The transportation or movement of substances through differentially permeable cell membranes against a concentration or electrical gradient with the expenditure of energy.
n. [Gr. aktis, ray; mys, muscle] Actin and myosin linkage in myofilaments that shortens when stimulated resulting in muscle contraction.
adj. [L. dim. acus, needle] Sharpened; needle-shaped; sharp pointed.
n.; pl. -eae [L. dim. acus, needle] (ARTHROPODA: Insecta) 1. In Diptera, one of the minute spines comprising the tomentum that covers the cuticula (except the wing ...
adj. [L. dim. acus, needle] 1. Pertaining to being armed with a sting or short, sharp points. 2. Furnished with aculeae.
Armed with saw-like teeth inclined toward one direction.
pl. of aculeus.
adj. [L. dim. acus, needle; forma, shape] Formed like a thorn.
n.; pl. -lei [L. dim. acus, needle] (ARTHROPODA: Insecta) 1. In Hymenoptera, an ovipositor in the form of a sting. 2. In Diptera, a sharp spine projected from the margin of ...
n. [L. acumen, point] 1. (ARTHROPODA: Crustacea) In Decapoda, the pointed tip of the rostrum. 2. (ARTHROPODA: Insecta) The pointed tip of genitalia.
adj. [L. acumen, point] Terminating in a long tapering point.
adj. [L. acumen, point] Nearly acuminate.
adj. [L. acumen, point] Minutely acuminate.
adj. [L. acus, needle; punctus, a pricking] Pertaining to fine superficial punctures as if made with a needle.
adj. [L. acutus, sharpened; angulus, angle] Forming or meeting at an acute angle.
adj. [L. acutus, sharpened] Pointed; forming an angle of less than 90°; having a sharp or sharply tapering point; see obtuse
adj. [L. acutus, sharpened; lingus, tongue] Having a sharp pointed tongue or mouth structure.
n. pl. [L. acutus, sharpened; lingua, tongue] A former classification (Acutilinguae) of bees that have a short pointed tongue; see obtusilingues.
adj. [Gr. a, without; kyklos, circle] Referring to noncyclic; not arranged in circles or whorls.
См. adactyle.
adj. [Gr. a, without; daktylos, finger] Lacking fingers, toes, or claws.
adj. [L. ad, near; ambulare, to walk] (ECHINODERMATA: Asteroidea) Relates to structures situated along the ambulacral grooves in starfish.
adj. [L. ad, near; anus, anus] Pertaining to being located near the anus.
adanal bursa
(NEMATA) Referring to a bursa not enclosing the tail terminus; leptoderan.
adanal copulatory papillae
(NEMATA) Male adanal supplements, glandular or sensory.
adanal segment
(ARTHROPODA: Chelicerata) In Actinotrichida Acari, segment XIV plus one of the paraproctal segments.
adanal supplements
(NEMATA) Organs of secretion and attachment near the male anus.
n. [L. ad, near; anus] (ARTHROPODA: Insecta) The fourth axillary sclerite of a wing.
adj. [L. ad, near; apertura, opening] (MOLLUSCA: Gastropoda) Refers to being toward the shell aperture.
adj. [L. ad, near; apex, top] (MOLLUSCA: Gastropoda) Slightly oblique or along the axis toward the top.
n. [L. ad, near; aptus, fit] The process and condition of showing fitness for a particular environment, as applied to characteristics of a structure, function, or entire ...
adj. [L. ad, near; aptus, fit] Capable of or showing adaptation.
adaptive divergence
Evolutionary new forms from a common ancestry due to adaptation to different environmental conditions.
adaptive ocelli
(ARTHROPODA: Insecta) Simple eyes or ocelli of most larvae; see stemmata, ocellus.
adaptive race
A race that is physiologically, rather than morphologically, distinguished.

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