Слова на букву moru-oocy (732) Dictionary of invertebrate zoology
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Слова на букву moru-oocy (732)

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see nematocide.
v.i. [Gr. nema, thread] (NEMATA) To populate or infest with nematodes; nematization n.
n. [Gr. nema, thread; blastos, bud] (CNIDARIA) A round or ovoid interstitial cell that forms a nematocyst; cnidoblast.
n. [Gr. nema, thread; L. caedare, to kill] Any agent lethal to nematodes.
См. cnida.
see plasmatocyte, cnidocyst.
see Nemata.
n. [Gr. nema, thread; eidos, form] A member of the phylum Nemata.
nematode wool
see nema wool.
n.; n. pl. [Gr. nema, thread] A phylum containing a large, diverse group of free-living, plant and animal parasitic roundworms, covered by cuticle and having well developed ...
n. [Gr. nema, thread; genos, offspring] (MESOZOA: Rhombozoa) The vermiform adult that reproduces vermiform embryos; see rhombogen. nematoid adj. [Gr. nema, thread; ...
see Nemata.
n. [Gr. nema, thread; logos, discourse] That branch of zoology dealing with nematodes.
См. nematomorphs.
n.; n. pl. [Gr. nema, thread; morphos, form] A phylum of worm-like animals that are free-living as adults and parasitic in arthropods as juveniles; horsehair worms; gordian ...
adj. [Gr. nema, thread; phagein, to eat] Feeding on nematodes.
n. [Gr. nema, thread; phorein, to carry] (CNIDARIA: Hydrozoa) A club-like or capitate ended structure in a hydroid colony containing nematocysts or adhesive cells; ...
n. [Gr. nema, thread; poros, pore] (BRYOZOA: Stenolaemata) A slender tubular kenozooecium that opens on the backside of the zoarium with tubules directed distally.
n. [Gr. nema, thread; osis, denotes morbid condition] (NEMATA) A morbid state due to parasitism by nematodes.
n. [Gr. nema, thread; sphaira, ball] (CNIDARIA: Anthozoa) In Actinaria, a club-like tentacle tip.
n. [Gr. nema, thread; stasis, stand] (NEMATA) 1. Any phenomenon that holds a population in equilibrium. 2. A chemical that does not kill nematodes, but paralyzes them.
n. [Gr. nema, thread; theke, case] (CNIDARIA: Hydrozoa) In Leptomedusae, small stemmed structures from which nematophores develop; one-chambered, single and immovable; ...
n. [Gr. nema, thread; zoon, animal; eidos, form] (CNIDARIA: Hydrozoa) A defense polyp; machozooid; dactylozooid.
См. Nemertines.
См. Nemertines.
n.; n. pl. [Gr. Nemertes, a nereid, sea nymph] A phylum of unsegmented, bilaterally symmetrical acoelomate worms, commonly called ribbon worms, that are predatory carnivores ...
see Nemertea.
adj. [Gr. nema, thread] Of or pertaining to nematodes.
n. [Gr. nema, thread] (NEMATA) An unknown or unidentified endogenous substance in nematodes that causes trap formation by predacious fungi.
adj. [L. nemus, woodland; colere, to dwell] Living in open woodland areas.
См. nemoricole.
1. The theory of evolution stressing the continuity of germ plasm and non-transmission of acquired characters (Weismannism). 2. Any evolutionary theory featuring natural ...
n. [Gr. neos, new; bios, life; genesis, beginning] The theory that life may have been evolved several times; recurring biopoiesis; see biogenesis.
n. [Gr. neos, new; blastos, bud] Undifferentiated cells that migrate to wounds and participate in repair and regeneration.
-radicolae (ARTHROPODA: Insecta) In Phylloxeridae, dimorph fundatrigeniae that will become radicolae (root gall formers).
(ARTHROPODA: Insecta) In Phylloxeridae, dimorph fundatrigeniae that will become gallicolae (leaf gall formers).
see neotropical region.
adj. [Gr. neos, new; ge, earth] Belonging to the Western Hemisphere or New World; see gerontogeous.
adj. [Gr. neos, new; L. natus, bborn] Recently born or hatched.
n. [Gr. neos, new; on, being; logos, discourse] The study of recent organisms.
n. pl. [Gr. neos, new; pherein, to carry] (PLATYHELMINTHES: Turbellaria) 1. Individuals in which the yolk and oocytes are produced by a separate gland, or are produced in ...
n.; pl. neoplasia [Gr. neos, new; plasma, formed or molded] An abnormal mass of tissue.
n. [Gr. neos, new; L. sistere, to stop] (ARTHROPODA: Insecta) In Hemiptera Adelgidae, the overwintering nymph of the sistens.
n. [Gr. neos, new; soma, body] The entire organism altered by neosomy.
n. [Gr. neos, new; dim. soma, body] The new structure that results from the neosomic process.
n. [Gr. neos, new; soma, body] External transformation, during the formation of new cuticle, in an active stadium of a group normally metamorphosing by molts, i.e., ...
n. [Gr. neos, new; stigma, point] (ARTHROPODA: Chelicerata) In Prostigmata Acariformes, a secondary spiracle near the base or farther forward of the chelicera.
n. [Gr. neos, new; taxis, arrangement] A secondary change of characters during phylogeny.
adj. or n. [Gr. neos, new; teinein, to extend] (ARTHROPODA: Insecta) In Isoptera, a supplementary reproductive in a colony that may retain some juvenile characters; the ...
see neoteny.
n. [Gr. neos, young; teinein, to extend] 1. A term referring to the condition in which the gonad completes its development prematurely before the normal differentiation of ...
neotenic plerocercoid
(PLATYHELMINTHES: Cestoda) All adult Caryophyllidea, whose adult developmental forms are thought to be extinct; exception: Archigetes; see neotenic procercoid.
neotenic procercoid
(PLATYHELMINTHES: Cestoda) In Caryophyllidea, adult Archigetes that reaches sexual maturity complete with cercomer.
n. [Gr. neos, young; teinein, to extend] One of the juvenile harmones.
См. neoteiny.
n. [Gr. neos, new; trichos, hair] (ARTHROPODA: Chelicerata) In Acari, secondary formation of setae by multiplication of primary setae in a given area.
neotropical region
A zoogeographical region extending south from the Mexican Plateau throughout Central America, the Caribbean and South America.
n. [Gr. neos, new; typos, type] A single specimen selected as the type specimen from as near to the original locale as practicle in cases where the original types are known to ...
see neontology.
nephridial papilla
(ANNELIDA) The projection marking the opening of the excretory organ. nephridioblast n. [Gr. nephros, kidney; blastos, bud] An ectodermal cell that is precursor to a ...
n. [Gr. nephros, kidney; poros, pore] 1. The exterior opening of an excretory organ (nephridium). 2. (ARTHROPODA: Crustacea) see nephropore.
see nephrostome.
n.; pl. -ia [Gr. dim. nephros, kidney; L. ium, nature of] 1. In various invertebrates, simple or branched, tubular structures that function in excretion, opening to the ...
see nephridioblast.
n. pl. [Gr. nephros, kidney; kytos, container] Cells that occur singly or in groups in various parts in an invertebrate body and function to transform original waste material ...
adj. [Gr. nephros, kidney; odis, labor] Having a single duct serving both excretory and genital purposes.
n. [Gr. nephros, kidney; gonos, progeny; L. ductus, leading] Combined genital and excretory ducts.
n.; pl. -ia [Gr. nephros, kidney; mixis, mingling] An organ with flame cells and coelomic funnel serving as both excretory and genital duct; a nephrogonoduct; see ...
n. [Gr. nephros, kidney; poros, pore] (ARTHROPODA: Crustacea) The elevated opening of the antennal gland on the ventral surface of the coxa of the antenna.
nephrostomal lips
(ECHIURA) The lip-like tissue surrounding the nephrostome; may be inconspicuous, expanded, or leaflike, or extended into long threads that may be spirally coiled.
n. [Gr. nephros, kidney; stoma, mouth] The coelomic opening of a nephridium.
n. [Gr. nepios, infant; konch, shell] (MOLLUSCA: Bivalvia) The first part of the dissoconch, when separated by a discontinuity.
adj. [Gr. nepios, infant] Pertaining to very young; postembronic larva; stage of development succeeding the embryonic.
nepionic constriction
(MOLLUSCA: Cephalopoda] In a nautiloid shell, a definite growth discontinuity of the shell micro-ornamentation thought to correspond to eclosion from the egg.
n. [Gr. nepios, infant; typos, type] The type larva of a species.
NEPO virus
Referring to NEmatode-transmitted, POlyhedralshaped viruses; see NETU virus.
neritic zone
The region of shallow water over the continental shelf that is subdivided into supratidal (wave splash area), intertidal (littoral), and subtidal regions.
n. [L. nervus, nerve] 1. A single fiber or group of fibers of the peripheral nervous system. 2. (ARTHROPODA: Insecta) A tubular wing vein.
nerve cell
see neuron.
nerve ending
The terminal arborization of a neuron.
nerve fiber
The dendrite or collateral branch of a neurocyte.
nerve net
A network of nerve cells connecting sensory and muscular elements in certain cnidarians, ctenophores, bryozoans, and some other invertebrates.
nerve pentagon
(ECHINODERMATA) The nerve ring around the mouth.
nerve ring
Any ring of nerve fibers, may be around the mouth, esophagus, anus, bell margin, etc; see circumesophageal commissure.
nerve root
That part of the nerve close to its origin from a ganglion, cord or brain; may be just inside or outside of the ganglion, etc.
См. nervicolous.
adj. [L. nervus, nerve; colere, to inhabit] Living on or in leaf veins.
adj. [L. nervus, nerve] Pertaining to nerves; restless or impulsive behavior as in nervous movements.
nervous system
A system of nerves with which an organism adapts to its environment.
see venation.
see nervures.
n. [L. dim. nervus, nerve] (ARTHROPODA: Insecta) 1. The tubular wing veins. 2. Branches of the tracheal system.
n.; pl. nesia [Gr. nesion, an islet] (ARTHROPODA: Insecta) In scarab beetle larvae, one or two sclerotized projecting marks between the inner end of the dexiotorma and ...
n. [A.S. nest] (ARTHROPODA: Insecta) A dwelling of social insects in which young are raised and reproductive females lay eggs; may be a burrow or hollow in soil, log, etc., ...
nest odor
(ARTHROPODA: Insecta) In social insects, the distinctive odor of a nest that enables its inhabitants to distinguish the nest from those belonging to other colonies or the ...
nest parasitism
(ARTHROPODA: Insecta) In Isoptera, one species of termite that lives on the carton walls of the nest of the host species.
nest robbing
see cleptobiosis.
n. pl. [A.S. nestlian, to build a nest] (MOLLUSCA: Bivalvia) Clams nestling in cavities or concealment in clay or among dead shells that occasionally produce variations in ...
nettle cells
see nematocysts.
NETU virus
Referring to NEmatode-transmitted, TUbularshaped viruses; see NEPO virus.
n. [Gr. neuron, nerve; L. foramen, hole] (ARTHROPODA: Insecta) The foramen through which the nerve cord passes when it is separated from the occipital foramen.
adj. [Gr. neuron, nerve] Pertaining to the nerves or nervous system of an organism.
neural arc
Simple receptor-effector nerve circuit.
neural canal
(ARTHROPODA: Insecta) The incomplete canal on the floor of the meso- and metathorax, formed by fusion of apodemes; functioning in the reception and protection of the ...
neural groove
(ARTHROPODA: Insecta) The median ventral groove, extending the entire length of the embryo, between the neural ridges.
neural lamella
The noncellular outer covering of the central nervous system consisting of mucopolysaccharides and mucoproteins with collagen-type fibrils in the outer part of this layer.
neural ridges
(ARTHROPODA: Insecta) In embryology, the two longitudinal ventral ridges that contain the lateral cords of the neuroblasts.
see venation.
see Schwann cell.
see axon.
n. [Gr. neuron, nerve; bios, life; taxis, arrangement] 1. The hypothetical migration of nerve cells and ganglia toward regions of maximum stimulation during phylogeny. ...
n. [Gr. neuron, nerve; blastos, bud] (ARTHROPODA: Insecta) In embryology, the inner layer of ectodermal cells that forms the nervous tissue; see dermatoblasts.
n.; pl. -ri [Gr. neuron, nerve; L. cirrus, curl] (ANNELIDA: Polychaeta) Cirrus normally on the lower edge of the neuropodium.
n. [Gr. neuron, nerve; kytos, container] The cell body of a neuron; the nerve cell; cyton.
n. pl. [Gr. neuron, nerve; L. dim. fibre, thread] Fine fibers running longitudinally in axons and dendrites and through the body of the neuron.
adj. [Gr. neuron, nerve; gennaein, to produce] 1. Forming nervous tissue. 2. Stimulating nervous energy for certain muscular or glandular reactions; see myogenic.
n. pl. [Gr. neuron, nerve; glia, glue] Nonnerve cells in the brain or ganglia; glia; glial cells; gliacytes.
neurohemal organs
(ARTHROPODA: Insecta) Organs involved with the release of products of neurosecretory cells into the hemolymph; corpora cardiaca best developed though less conspicuous ones ...
n. [Gr. neuron, nerve; hormaein, to excite] A hormone produced by neurosecretory cells.
see neurotransmitter.
neuroid transmission
Arousal activity by cells other than nerve cells.
see Schwann cell.
n. [Gr. neuron, nerve; meros, part] (ARTHROPODA: Insecta) Any of the transitory segmental elevations in the wall of a developing embryo.
n. [Gr. neuron, nerve] A nerve cell.
see neuron.
n. [Gr. neuron, nerve; pilos, felt] The central part, or mass of different axons within a ganglion; neurospongium.
n. [Gr. neuron, nerve; plasma, formed or molded] Cytoplasm of neurons.
n. [Gr. neuron, nerve; pous, foot] (ANNELIDA: Polychaeta) The ventral division of the parapodium, supported internally by one or more chitinous rods or aciculae.
see trichopore.
see Holometabola.
adj. [Gr. neuron, nerve; pteron, wing] (ARTHROPODA: Insecta) Pertaining to the order Neuroptera.
neurosecretory cells
(ARTHROPODA: Insecta) Cells found in the ganglia of the central nervous system that secrete hormones which act directly on effector organs or on other endocrine organs.
see neuropile.
see synapse.
n. [Gr. neuron, nerve; L. trans, across; mittere, to send] A chemical secreted at nerve endings to transmit a nervous impulse across a synapse; neurohumor.
adj. [Gr. neuron, nerve; tropos, turn] Having an affinity for nervous tissue.
n. [Gr. neuron, nerve; L. dim. tubus, tube] Microtubules in nervous tissue.
n. [Gr. neustos, able to swim] Small organisms that float or swim in or on the surface film of water; see seston.
n. [L. ne, not; uter, either] 1. Sexless. 2. A sterile organism. 3. A non-fertile mature female.
neutral synoekete
(ARTHROPODA: Insecta) An insect living on the refuse of a host colony but providing little in return.
n. [L. ne, not; uter, either; ismus, denoting a condition] Organisms living together with no mutual harm or benefit; hamabiosis.
new name
A replacement name for an available name; nomen novum.
n. [L. nidus, nest] A position or occupation filled by an organism in the food-web of a community.
see negative geotropism.
adj. [L. nictare, to wink] An ocellus bearing a lunate spot.
nidamental gland
Any of various structures that secrete a capsule or covering material for an egg or egg masses.
adj. [L. nidus, nest; colere, to dwell] Pertaining to an organism that spends much of its life in the nest of its host.
adj. [L. nidus, nest; facere, to make] Building a nest.
adj. [L. nidus, nest; fugere, to flee] Departing the nest soon after birth.
n.; pl. nidi [L. nidus, nest] 1. A group of regenerative cells; a cell-group. 2. A location for the natural deposit of eggs; a hatching place. 3. The specific locality of a ...
n. [L. niger, black] Black; glossy black.
adj. [L. niger, black; -rimus, superlative ending] Very black.
adj. [L. nigrescens, to grow black] Turning black; blackish.
n. (ARTHROPODA: Crustacea) In Decapoda, the postlarval stage of Scyllaridae and Palinuridae; pseudibacus; puerulus.
См. nitidus.
adj. [L. nitidus, shining] Glossy; shining; brilliant; lustrous.
n. [Gr. nitron, native soda] A salt or ester of nitric acid (HNO3).
n. [Gr. nitron, native soda] A salt or ester of nitrous acid (HNO2).
n. [Gr. nitron, native soda; gennaein, to produce] A colorless, odorless gas that constitutes about four-fifths of the atmosphere.
nitrogen cycle
Inorganic nitrogen incorporated into organic nitrogen in living organisms and returned to inorganic nitrogen by breakdown of the organic molecules on death of the living ...
adj. [Gr. nitron, native soda; gennaein, to produce] Pertaining to, or containing nitrogen.
n. pl. [A.S. hnitu, egg of louse] (ARTHROPODA: Insecta) In Siphunculata, the eggs; particularly when cemented to hair.
adj. [L. niveus, snow] Resembling the color of snow.
adj. [L. nocturnus, of the night] Occurring or performed at night; see diurnal, crepuscular.
nocturnal eyes
(ARTHROPODA: Chelicerata) The pearly white eyes of Arachnida.
nodal furrow
(ARTHROPODA: Insecta) In Odonata, a transverse suture of the wing, beginning at the costal margin corresponding to the nodus and extending toward the inner margin; costal ...
n. [L. nodus, knob] 1. A knob or swelling. 2. (BRYOZOA) A place of articulation in a colony.
adj. [L. nodus, knob; cornu, horn] (ARTHROPODA: Insecta) Having antennae with joints swollen at the apex.
adj. [L. nodus, knob; fero, bear] Having or bearing nodes.
adj. [L. nodus, knob; forma, shape] In the form of a knob or knot.
adj. [L. nodus, knob] With small knotlike protuberances.
adj. [L. dim. nodus, knob] Having small knobs or nodule- like projections.
nodular sclerite
see epaulett.
n. [L. dim. nodus, knob] A swollen knob-like structure.
n. [L. dim. nodus, knob] (ANNELIDA) An enlarged region on a crotchet chaeta at about midlength.
n. [L. nodus, knob] (ARTHROPODA: Insecta) 1. In Hymenoptera Ichneumonidae, a dorsal prominence on the tip of the ovipositor, shortly before the apex. 2. In Odonata, a ...
n. [Gr. nomas, roaming] (ARTHROPODA: Insecta) Frequent movement by a colony from one site to another.
nomen conservandum
A name preserved by action of the International Commission on Zoological Nomenclature and placed on the appropriate official list.
nomen dubium
The name of a nominal species that lacks available evidence so as to permit recognition of the zoological species to which it was applied.
nomen inquirendum
The scientific name is subject to investigation.
nomen novum
see new name.
nomen nudum
A published binominal without an adequate description, definition or illustration to permit its official adoption.
nomen oblitum
No longer in effect in ICZN after 1973; a name that has not been used in the primary zoological literature for 50 years; a forgotten name.
nomen taxon
Any named taxon, objectively defined by its type, whether valid or invalid.
n. [L. nomen, name; calare, to call] A nomenclatural book containing a list of scientific names, not for taxonomic purposes.
n. [L. nomen, name; calare, to call] In biology, a system of names for biological units.
n. [L. nomen, name; ismus, denoting a condition] Doctrine of nominalists denying the existence of universals, and emphasizing the importance of man-given names for the grouping ...
adj. [L. nomen, name] Pertaining to a subordinate taxon that contains the type of the subdivided higher taxon and bears the same name as the original parent taxon.
n. [L. non, not; congressus, meeting] Chromosomes not pairing on the spindle equator.
n. [L. non, not; cum, with; junctus, joined] Absence of meiotic chromosome pairing.
non-essential amino acids
Amino acids that can be synthesized by animals and not required in their diet.
non-medullated nerve
A nerve fiber lacking a myelin sheath; non-myelinated.
noncelliferous side of colony
(BRYOZOA: Stenolaemata) The reverse or back side of the colony.
noncellular outgrowth
A cuticular prominence of the bodywall.
see acoelomate.
nondimensional species
The concept of a species characterized by the noninterbreeding of two coexisting demes, uncomplicated by space and time.
n. [L. non, not; disjunctus, unyolked] The failure to separate of paired chromosomes during meiosis.
nonincubatory oysters
(MOLLUSCA: Bivalvia) Oysters that do not incubate their larvae.
nonocellate cercariae
(PLATYHELMINTHES: Trematoda) Furcocercous cercariae that develop in sporocysts or rediae and penetrate into a vertebrate to encyst.
nonsense codon
see nonsense mutation.
nonsense mutation
A mutation that changes a coding triplet into a triplet that codes for no amino acid and terminates the polypeptide chain.
normalizing selection
The removal of all alleles that produce deviations from the normal (average) phenotype of a population by selection against all deviant individuals.
adj. [Gr. nosos, disease; gennaein, to produce] Causing disease; pathogenic.
n. [Gr. nosos, disease; graphos, writing] A branch of pathology dealing with the description of diseases.
pl. of notum.
n. [Gr. notos, back; L. corium, leather] (ARTHROPODA: Insecta) A membranous area separating the pleuron and notum in the thorax; sometimes reduced to a suture.
notal comb
see genal comb.
adj. [L. nota, mark] Marked by spots or depressed marks.
n. [L. nota, mark] The method of identifying characters by a system of numbers, letters or ratios.
n.; pl. -lices, [Gr. notos, back; L. aulix, furrow] (ARTHROPODA: Insecta) One of a pair of grooves on the mesoscutum, from the front margin to one side of the midline and ...
n. [ME. nock, a notch] (MOLLUSCA: Gastropoda) A break or irregularity in the peristome, denoting the position of the siphon.
adj. [ME. nock, a notch] Nicked or indented; usually of a margin.
n. [Gr. notos, back; kephale, head] (ARTHROPODA: Insecta) 1. In Notonectidae, the dorsal view of the head. 2. (ARTHROPODA: Chelicerata) In Arachnida, the dorsal shield of ...
n. [Gr. noton, back; L. cirrus, curl] (ANNELIDA: Polyuchaeta) Cirrus of the notopodium.
see chilidium.
adj. [Gr. notos, back; odous, tooth] (ARTHROPODA: Insecta) Pertaining to larval Notodontidae with a variously humped dorsal surface.
n. [Gr. notos, back; ge, earth] The zoogeographical area including Australia, New Zealand and Pacific Ocean Islands regions.
n. [Gr. noton, back; gaster, belly] (ARTHROPODA: Chelicerata) The posterior dorsal opisthosomatal shield.
adj. [Gr. notos, back; nektos, swimming] Swimming on the back.
n. pl.; sing. notopleuron [Gr. notos, back; pleuron, side] (ARTHROPODA: Insecta) In Diptera, a sometimes sunken, triangular area on the thoracic dorsum, at the lateral end ...
notopleural bristles
(ARTHROPODA: Insecta) In Diptera, bristles located in a small triangular area, one on each corner of the notum just above the anepisternum or mesopleura; between the humeral ...
notopleural suture
(ARTHROPODA: Insecta) A suture between the notum and the pleural sclerites.
n. [Gr. notos, back; pous, foot] (ANNELIDA: Polychaeta) The dorsal or upper division of the parapodium, supported internally by one or more chitinous rods, or aciculae.
n. [Gr. notos, back; pteron, wing] (ARTHROPODA: Insecta) The first axillary sclerite of a wing.
n. [Gr. notos, back; L. seta, bristle] (ANNELIDA) Seta originating on the notopodium.
n. [Gr. notos, back; theke, case] (ARTHROPODA: Insecta) That region of a pupa covering the dorsal surface of the abdomen.
n. [Gr. notos, back; thyrion, door] (BRACHIOPODA) The triangular notch in the dorsal valve, when present, open to the hinge line facilitating pedicle exit, usually ...
n. [Gr. notos, back] 1. (ARTHROPODA: Crustacea) The shrimplike decapod posterior part of the dorsal carapace. 2. (ARTHROPODA: Insecta) The dorsal surface of a body segment, ...
n. [ML. nucha, neck] The upper surface of the neck connecting the head and thorax; nuchal adj..
nuchal caruncle
(ANNELIDA) A sensory organ on the prostomium, or extending posteriorly in the form of a ciliated ridge or groove.
nuchal cavity
(MOLLUSCA: Gastropoda) In Patellacea, the enlarged portion of the pallial cavity above the head.
nuchal cirrus
see cirrus.
nuchal constriction
(MOLLUSCA: Cephalopoda) In most Sepiidae and Teuthoidea and a few Octopodidae, the separation or constriction between the head and body or neck.
nuchal organ
(s). 1. (ANNELIDA: Polychaeta) A pair of ciliated sensory pits or slits in the head region. 2. (ARTHROPODA: Crustacea) In Branchiopoda, a sensory organ on the upper side ...
nuchal papilla
(ANNELIDA: Polychaeta) Small sensory papilla at the base of the prostomium; cirrus.
nuchal tentacles
(PLATYHELMINTHES: Turbellaria) In Polycladida, tentacles well set back from the anterior part of the body.
nuclear envelope
Double layered membrane separating the nucleoplasm from the cytoplasm; nuclear membrane.
nuclear plate
A metaphase or equitorial plate.
nuclear sap
see nucleoplasm.
nuclear whorls
(MOLLUSCA: Gastropoda) The whorls of the protoconch that emerges from the egg.
adj. [L. nucleus, kernel] Having a nucleus.
nuclei of Semper
(ARTHROPODA: Insecta) The nuceli of the crystalline cone cells.
nucleic acids
Polymers of nucleotides that are active in inheritance as genes, plasmids, etc.
nucleolar chromosome
Any chromosome with a nucleolar organizer.
nucleolar organizer
Chromosome region that is active in nucleolus formation.
n. [L. dim. nucleus, kernel] A small granule within the nucleolus.
n. [L. dim. nucleus, kernel; Gr. nema, thread] Filamentous structures within the nucleolus of all cells.
n. [L. dim. nucleus, kernel] Small, dense, more or less spherical bodies in the nucleus of cells associated with the nucleolar organizer.
n. [L. dim. nucleus, kernel; Gr. plasma, formed or molded] The protoplasmic fluid contained in the nucleus.
nucleoplasmic index
The ratio of nuclear volume to cytoplasmic volume; seems to trigger cell division; nucleoplasmic ratio.
n. [L. dim. nucleus, kernel; Gr. proteios, primary] A compound of nucleic acid and protein.
n. [L. dim. nucleus, kernel] Compounds derived by hydrolysis of nucleic acids or nucleotides consisting of a purine or pyrimidine base linked to ribose or deoxyribose.
n. [L. dim. nucleus, kernel] Unit of the DNA and RNA molecules, including phosphoric acid, a purine or pyrimidine base, and a ribose.
n.; pl. -lei [L. nucleus, kernel] 1. A spheroidal structure present in a cell containing the chromatin. 2. (MOLLUSCA: Gastropoda) The earliest-formed part of the shell, or ...
adj. [L. nudus, naked; branchiae, gills] (BRACHIOPODA) Having the gills uncovered and not protected by a shell or membrane in the brachial chamber.
n. [L. nudus, naked] (ARTHROPODA: Insecta) A small bare, sensitive portion of a butterfly antenna.
adj. [L. nollus, none; plectare, to weave] A polyploid having all genes for a particular recessive character.
numerical phenetics
The hypothesis that relationship between organisms can be determined by a calculation of an overall, unweighted similarity value.
numerical taxonomy
Numerical evaluation of similarity between taxonomic units and grouping of these units into higher taxa on the basis of their affinities; taxometrics; see taxonomy.
nuptial flight
(ARTHROPODA: Insecta) In Hymenoptera, the mating flight of winged males and females.
nurse cells
1. Cells of developing oocytes that provide material for further growth; trophocytes. 2. (ARTHROPODA: Insecta) In some species, the nurse cells synthesize nucleic acids ...
adj. [L. nutare, to nod] Nodding; drooping; having a tip bent horizontally.

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