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n. [Gr. makros, large; L. septum, partition] 1. (CNIDARIA: Anthozoa) The variously functioning primary septum. 2. (NEMERTEA) In asexual reproduction, a partition ...
n. [Gr. makros, large; siphon, tube] (MOLLUSCA: Cephalopoda) Internal siphon of certain cuttlefishes, and all octopuses.
n. [Gr. makros, large; symbios, living together] The larger of two symbiotic organisms.
n. [Gr. makros, large; taxis, arrangement] The classification of higher taxa.
n. pl.; sing. -ium [Gr. makros, large; thrix, hair] 1. The larger surface hairs. 2. (ARTHROPODA: Insecta) The large hairs on the wing membrane.
n. [Gr. makros, large; typos, type] (CNIDARIA: Anthozoa) Modified arrangement of mesenteries consisting mainly of macromesenteries; see microtype.
adj. [Gr. makros, large; oura, tail] Long-tailed.
n.; pl. maculae [L. macula, spot] 1. A colored spot of rather large size. 2. A spot level with surrounding surface. 3. (BRYOZOA: Stenolaemata) Prominences, and less ...
adj. [L. macula, spot] Splashed or spotted; blotched.
n. [L. mater, mother; Gr. poros, friable stone] (CNIDARIA) A stony, branched, reef building coral of the order Madreporia.
madreporic plate
(ECHINODERMATA: Asteroidea) An enlarged interradial plate on the disc, that connects the water vascular system to the sea.
n. [L. mater, mother; porus, pore] (ECHINODERMATA) An oral or aboral perforated plate of the water-vascular system connecting with the stone canal; sieve plate.
main bud
(BRYOZOA: Phylactolaemata) The largest of three bud primordia which occurs on every mature zooid, and is the first to form a new polypide.
major gene
Controls production of qualitative phenotypic effects in contrast to its modifiers.
major worker
(ARTHROPODA: Insecta) The largest worker subcaste in social insects; in Formicidae, usually specialized for defense and referred to as a soldier; see media worker, minor ...
n.; pl. malae [L. mala, cheek, jaw] 1. A lobe; ridge or grinding surface. 2. (ARTHROPODA) a. Part of the maxilla of certain insects. b. Mandible of some myriapods.
adj. [Gr. malakos, soft] Soft textured.
n. [Gr. malakos, soft; logos, discourse] The branch of zoology dealing with mollusks, the animal inside the shell.
adj. [Gr. malakos, soft; philios, loving] (MOLLUSCA: Gastropoda) Being pollinated by the action of gastropods.
n.; pl. -ses [L. mala, cheek, jaw; Gr. apophysis, projection] (ARTHROPODA: Chelicerata) In Acari, the paired anterior region of the infracapitulum.
adj. [L. mala, cheek] Of or about the cheek region.
malar cavity
(ARTHROPODA: Chelicerata) In Acari, interior of the malapophysis that connects to the pharynx.
n. [L. mas, a man] An individual that produces sperm cells but not egg cells; designated by.
male ducts
См. male gonoducts.
male funnel
(ANNELIDA: Oligochaeta) A funnel or rosette-shaped enlargement of the ental end of the sperm duct for passage of sperm through the central aperture into lumen of the duct ...
male gonoducts
see sperm ducts.
male tube
(ECHIURA) A sexually maturing area in which developing males are housed for one to two week inside the female.
male-cell receptacle
(ARTHROPODA: Crustacea) In Rhizocephala, a pocket or pair of pockets within the mantle cavity of the female where cells of male cyprid undergo spermatogenesis.
n. [L. dim. mala, jaw] (ARTHROPODA: Symphyla) The distal toothed process on the outer stipes of the deutomala of some myriapods.
malleate mastax
(ROTIFERA) Chewing apparatus; rami untoothed and unci are curved plates with prong type teeth.
n. pl. [L. dim. malleus, hammer] A hammered appearance.
n.; pl. -li [L. dim. malleus, hammer] 1. (ARTHROPODA: Chelicerata) In Solpugida, 3 to 5 innervated appendages on the coxae and trochanter of the fourth leg; function ...
malleoramate mastax
(ROTIFERA: Monogononta) Chewing apparatus, variant of the ramate type of mastax occurring in the order Flosculariaceae.
n.; pl. malli [L. malleus, hammer] (ROTIFERA) Unci and manubria of the mastax, collectively.
Malpighian tubules
(ARTHROPODA) Long, thin excretory tubules extending into the body cavity from the posterior region of the gut in insects, arachnids and myriapods.
see mesogloea.
n. [F. mamelon, protuberance] 1. (ECHINODERMATA: Echinoidea) Terminal knob on the boss that articulates with the spine on the test. 2. (NEMATODA: Secernentea) Two or ...
adj. [L. mamilla, small breast] Having rounded protuberances or wart-like projections; mammiform; mammose.
n. [L. mancus, imperfect] (ARTHROPODA: Crustacea) In Peracarida, a juvenile or postlarva that lack the last thoracopod when released from the marsupium.
n. [F. manchette, cuff] (NEMATA) Line of demarcation between the cheilostome and esophastome; nema\'s collar; sleeve.
mancoid stage
(ARTHROPODA: Crustacea) Postlarval stage in Leptostraca, with rudimentary 4th pleopod.
n. [L. mandibula, jaw] 1. A jaw. 2. (ANNELIDA: Polychaeta) The ventral chitinous plates or rods, maybe dentate, against which the maxilla work. 3. (ARTHROPODA: ...
mandibular fossa
(ARTHROPODA: Insecta) The dorsal articulation of the mandible.
mandibular gland
(ARTHROPODA: Insecta) A sac-like reservoir usually paired, and partially or completely lined by secretory cells, opening in the mesal junction of the mandible with the ...
mandibular palp
1. (ARTHROPODA: Crustacea) In Cirripedia, distally articulated part of the mandible functioning in feeding or cleaning; in Acrothoracica associated with the mandibular ...
mandibular plates
(ARTHROPODA: Insecta) In Hemiptera, plates between and attached to the mandibular stylets and the ventral surface of the sucking pump.
mandibular pouch
(ARTHROPODA: Insecta) In Thysanoptera, a ventrally oriented cone formed by the labrum and labium containing maxillary stylets and a single (left) functional mandible, ...
mandibular ring
(NEMATODA: Adenophorea) In Enoplida, transverse extension of the mandibles in the buccal cavity.
mandibular scar
(ARTHROPODA: Insecta) In certain Coleoptera pupae, round or oval areas with raised margins that serve as supports for the deciduous provisional mandibles.
mandibular sclerite
(ARTHROPODA: Insecta) In some larval Diptera, mouth-hooks articulating basally with the intermediate (hypostomal) sclerites.
n. [L. mandibula, jaw] Formerly a subphylum of arthropods including Myriapoda, Crustacea and Insecta.
adj. [L. mandibula, jaw] Having jaws fitted for chewing; mandibuliform.
v. [L. manducare, to chew] To bite; eat.
n. [L. manica, sleeve] (ARTHROPODA: Insecta) In Lepidoptera, the inner layer of the anellus, that fastens around the aedeagus.
adj. [L. manus, hand; forma, shape] Hand-shaped.
see prothorax.
n. [Gr. manna, morsel or honey dew] (ARTHROPODA: Insecta) Honeydew (90-95% sugar) produced by certain coccids, used as human food.
see hemimetabolous metamorphosis.
n. [L. mantellum, cloak] 1. Something that enfolds, envelopes or covers. 2. (ARTHROPODA: Crustacea) In thoracic Cirripedia, membranous covering of the body, often ...
mantle canal
(BRACHIOPODA) One of several flattened, tube-like extensions of the body cavity into each mantle lobe.
mantle cavity
Specialized cavity found in certain mollusks, brachiopods and crustaceans lined with epidermis and usually exposed to sea or fresh water, or air, due to habitat; may or may ...
mantle cells
(ARTHROPODA: Insecta) Corneagenous cells of the eye enclosing the retina.
mantle fold
(MOLLUSCA: Bivalvia) In oysters, one of 3 small folds at the edge of a mantle lobe.
mantle groove
(BRACHIOPODA) Site of proliferation of the periostracum and bears the setae.
mantle lobe
1. (BRACHIOPODA) Lobe of the body wall that secretes and lines the valves; in some, cecae project into perforations (punctae) in the shell serving as food repositories of ...
mantle papilla
see caecum.
mantle skirt
(MOLLUSCA) Roof of the mantle cavity formed by the projection of the mantle from the edge of the visceral mass.
n. [L. manubrium, handle] 1. (ARTHROPODA: Crustacea) In fish parasitic Copepoda, the handle or distal part of the attachment organ. 2. (ARTHROPODA: Insecta) The basal part ...
n. [L. manus, hand] 1. The hand. 2. (ARTHROPODA: Crustacea) Broad proximal part of a propodal cheliped of a Decapoda. 3. (ARTHROPODA: Insecta) Formerly applied to the ...
manuscript name
An unpublished scientific name; see nomen nudum.
marble gall
(ARTHROPODA: Insecta) The hard spherical gall of Cynipidae Adleria kollari , usually on oak that produce the agamic generation of that species.
adj. [Gr. margarites, a pearl] Pearly in texture; nacreous.
n. [L. margo, border] 1. A border or an edge. 2. (ARTHROPODA: Insecta) The edge of a wing. 3. (CNIDARIA: Anthozoa) The junction of the oral disk and collum of a sea ...
marginal bodies
(PLATYHELMINTHES: Trematoda) In Aspidogastrea, sensory pits or short tentacles between marginal loculi of the opisthaptor.
marginal bristles
(ARTHROPODA: Insecta) In Diptera, abdominal bristles inserted dorsally on the margins of the segment.
marginal carina
(MOLLUSCA: Bivalvia) A ridge running from umbo to posteroventral angle of the shell delimiting the posterior area in Trigoniacea.
marginal cell
(ARTHROPODA: Insecta) A cell in the distal part of the wing bordering the costal margin.
marginal nuclei
(NEMATA) Nuclei of marginal cells in the nematode esophagus; believed to lay down the fibers from the apex of the lateral arm to the basement membrane of the esophagus, or ...
marginal tubes
(NEMATA) The distal cylindric endings of some esophageal radii, other forms have convergent terminals.
marginal veins
(ARTHROPODA: Insecta) A vein running along the front margin of a wing that gives off a stigmal vein.
n. [L. margo, border] (PORIFERA) Spicules protruding upward around an oscule.
adj. [L. margo, border] Having a distinct margin in appearance or structure.
adj. [L. mare, sea] Pertaining to or inhabiting the sea, ocean, or other salt waters.
n. [L. maritus, conjugal] (PLATYHELMINTHES: Trematoda) A sexually mature fluke.
marker gene
Genetic marker; gene of known position and conspicuous in its action.
adj. [L. marmor, marble] Having color or veined like marble.
n. [A.S. mersc, marsh] An area of wet soil.
n. [L. marsupium, bag] 1. Brood pouch. 2. (ARTHROPODA: Crustacea) The oostegite in Peracarida, or brood chamber or pouch in others. 3. (ARTHROPODA: Insecta) In marsupial ...
n. [Ar. maskhara, buffoon] (ARTHROPODA: Insecta) In dragonfly nymphs, the prehensile labium that conceals the other mouthparts; masked adj..
masked pupa
see pupa larvata.
mass communication
(ARTHROPODA: Insecta) In Hymenoptera, transfer of information among large groups of individuals which cannot be accounted for by one to one communication.
mass provisioning
(ARTHROPODA: Insecta) Social behavior of solitary bees and wasps by storing cells with sufficient food to satisfy their developing offspring and closing them down before the ...
n. [Gr. mastax, jaws] (ROTIFERA) A muscular rounded, trilobed, or elongate organ containing trophi; in suspension feeders adapted for grinding, in carnivores modified as ...
n. [L. mastecare, to chew] The act of chewing; to grind or crush.
masticatory process
see gnathal lobe.
masticatory stomach
see gastric mill.
adj. [L. mastecare, to chew; Gr. morphos, form] Designed for chewing.
n. pl.; sing. mastidion [Gr. mastos, breast] (ARTHROPODA: Chelicerata) Small, conical, nipple-like tubercles on the front of the chelicerae of small spiders.
См. mastigobranchia.
n. [Gr. mastix, whip; branchos, gill] (ARTHROPODA: Crustacea) A slender respiratory process at the base of the epipod.
n. [Gr. mastix, whip; pherein, to bear] (CNIDARIA: Anthozoa) A nematocyst with a cylindrical hempe and tube extending beyond the hempe; microbasic with hempe not more than ...
mastigopus larva
(ARTHROPODA: Crustacea) Larva in the megalopa stage found among some Decapoda.
maternal inheritance
Inheritance controlled by maternal extra chromosomal determinants.
maternal zooid
(BRYOZOA: Gymnolaemata) An autozooid that extrudes eggs.
mating plug
(ARTHROPODA: Insecta) A plug formed from the accessory gland secretions of the male, deposited in the genital chamber of the female, thought to prevent loss of sperm in some ...
mating spines
(ARTHROPODA: Insecta) In female mayflies, compound conical spines covering the lower surface of the egg valve.
adj. [L. mater, mother; filia, daughter] (ARTHROPODA: Insecta) In Apis, having colonies made up of mothers and daughters.
n.; pl. matrices [L. mater, mother] 1. That which gives form, origin or foundation to something enclosed or embedded in it. 2. (NEMATODA: Secernentea) The gelatinous ...
matrix glands
(NEMATODA: Secernentea) An excretory cell or modified rectal glands that secrete the gelatinous matrix through the anus or excretory pore and into which eggs maybe ...
matrix layer
(NEMATA) Historically, a cuticular stratum of spongy material between the fibrillar layer and the boundary layer.
n. [L. mater, mother] (ARTHROPODA: Insecta) Macromolecular components (proteins) contained in the seminal fluid of some male Culicidae that inhibits further insemination of ...
n. [L. maturus, ripe] The act or process pertaining to the developmental steps leading to reproducing adults.
maturation divisions
A series of nuclear divisions in the formation of the gametes in which the chromosome number, through meiosis is reduced from diploid to haploid.
maturation feeding
(ARTHROPODA: Insecta) Feeding required by some insects before their gonads can mature to produce eggs.
maturation zone
In males of many invertebrates, that part of the genital follicle below the germarium in which each spermatocyte undergoes the two meiotic divisions to produce spermatids; ...
mature region
see exozone.
n. [L. maxilla, jaw; pons, bridge] (ARTHROPODA: Insecta) A bridge formed by a midline fusion of the lower maxillariae and the postgenae; maxapontal adj..
n.; pl. -llae [L. maxilla, jaw] 1. (ANNELIDA: Polychaeta) The large, hook-shaped, dorsal chitinous jaw plate. 2. (ARTHROPODA) In most arthropods, one of the paired ...
adj. [L. maxilla, jaw] (ARTHROPODA) Of or pertaining to the maxilla.
maxillary carrier
(ANNELIDA: Polychaeta) A posterior support structure for the maxilla.
maxillary glands
(ARTHROPODA) Glands belonging to the maxillary segment, possibly functioning in the lubrication of the mouthparts.
maxillary guides
(ARTHROPODA: Insecta) In Anoplura, paired structures of wrinkled sucking lice arising from the maxillary appendages that function as guides for the dorsal stylet.
maxillary palp
См. maxillary palpus.
maxillary palpus
; pl. -pi (ARTHROPODA: Insecta) Small sensory organ arising from the maxilla, used to test quality of food; see labial palp.
maxillary segment
see maxillulae.
maxillary stylets
(ARTHROPODA: Insecta) In Hemiptera, the inner pair of stylets of the trophic sac.
maxillary tentacle
(ARTHROPODA: Insecta) In female Tegeticula Lepidoptera, an inner elongate lobe of the maxilla, adapted for holding a large mass of pollen; perhaps palpifers.
adj. [L. maxilla, jaw; pes, foot] (ARTHROPODA: Crustacea) The paired appendages on thoracic somites 1-3 posterior to the maxillae, that usually function in feeding; ...
См. maxillipe.
См. maxillipe.
n. pl.; sing. -ula [L. dim. maxilla, jaw] 1. (ARTHROPODA: Crustacea) The first maxillae having more than one pair of maxillae; paragnath. 2. (ARTHROPODA: Insecta) In ...
n. [L. maximus, greatest] (ARTHROPODA: Insecta) In Formicidae, a major worker or one of the soldier caste.
mayrian furrow
see notaulix.
meatal cleft
(ARTHROPODA: Insecta) A slit or line on the trumpet of some mosquito pupae extending into the meatus from the spiracular opening, facilitating enlargement of the opening at ...
n. [L. metus, passage] A channel or duct.
mechanical isolation
Reproductive isolation due to mechanical incompatibility of male and female genitalia.
n. [Gr. mechane, contrivance; L. recipere, to receive] Specialized structures that perceive any mechanical distortion of the body, i.e., touch, vibrations, altitude and ...
n. pl.; sing. -ium [Gr. mekon, poppy] 1. (ARTHROPODA: Insecta) Waste products of pupal metabolism that are discharged shortly after adult emergence. 2. (CNIDARIA: ...
n. [L. medius, middle] 1. The middle structure. 2. (ARTHROPODA: Insecta) The longitudinal vein between the cubitus and the radius of the wing; medial adj..
media worker
(ARTHROPODA: Insecta) In Formicidae, an individual belonging to the medium-size subcaste in a polymorphic series of three or more worker subcastes; see minor worker, major ...
adv. [L. medius, middle; ad, toward] Toward the median plane or line; mesad; admedial.
medial cross vein
(ARTHROPODA: Insecta) A cross vein connecting two branches of the media of the wing.
medial-cubital cross vein
(ARTHROPODA: Insecta) A cross vein of an insect wing between the posterior medial vein and the anterior cubital vein.
adj. [L. medius, middle] In the middle; along the midline of the body; middle variate when variates are arranged in order of magnitude.
median bulb
see metacorpus.
median caudal
nerve (NEMATA) A nerve extending from the dorsorectal ganglion to the tail.
median cercus
see urogomphus.
median cord
(ARTHROPODA: Insecta) An embryonic chain of cells derived from the ectoderm lining the neural groove.
median dorsal plate
(ARTHROPODA: Crustacea) In some Peracardia, an elongate plate separating carapace valves posterodorsally.
median esophageal bulb
see metacorpus.
median eye
see nauplius eye.
median lamina
see median wall.
median latus
(ARTHROPODA: Crustacea) In Lepadomorpha, a plate between the rostral and carinal latera in forms with paired latera in one whorl; see lateral.
median ligament
(ARTHROPODA: Insecta) A common thread formed by the ovarioles of opposite sides that help maintain the ovaries in position and is attached to the body-wall, the fat-body or ...
median oviduct
see common oviduct.
median segment
(ARTHROPODA: Insecta) The basal segment of the abdomen when it is fused with the metathorax during the change from larva to pupa; see propodeum, epinotum.
median tubuli
(BRYOZOA: Stenolaemata) Aligned pustules or mural lacunae in a laminated skeleton.
median valve
see intermediate valve.
median wall
(BRYOZOA: Stenolaemata) Erect colony wall parallel to the growth direction from which zooids bud to form a bifoliate colony.
n. [L. medius, middle] Association, internuncial, neuron; chemical such as a hormone that controls or modifies a metabolic process.
medio-cubital cross vein
see medial-cubital cross vein.
mediolateral nerve cord
(NEMATA) Several nerves extending from the median and posterior externolateral ganglia and the posterior internolateral ganglia to the lumbar ganglia.
n. [L. medius, middle; tergum, back] (ARTHROPODA: Insecta) In Diptera, the median region of the mesopostnotum.
adj. [L. medius, middle; venter, belly] In the middle ventral line.
see haustellum.
n. [L. medulla, marrow, pith] 1. Central portion of an organ. 2. (ARTHROPODA) Apical lobes of the brain; the central synaptic region; epiopticon; medulla externa; ...
medulla externa
see medulla.
medulla interna
(ARTHROPODA: Insecta) The lobular complex.
medulla X-organ
n.; pl. -sae [L. Medusa, a gorgon of mythology] (CNIDARIA) The free swimming umbrella-like forms.
see abyssobenthos.
adj. [Gr. megas, large; kephale, head] Having an abnormally large head; see microcephalic, mesocephalic.
n. [Gr. megas, large; klados, branch] (PORIFERA) In megascleres, a relatively large smooth desma; megaclone.
see megaclad.
n. [Gr. megas, large; drilos, worm] (ANNELIDA: Oligochaeta) Terrestrial forms; not used systematically, although recognized as a general term; see microdrile.
n. pl. [Gr. megas, large; aisthesis, sensation] (MOLLUSCA: Polyplacophora) Large sensory organs terminating in the tegmentum in the forms of eyes with cornea, lens, ...
see macrolecithal.
megalopa stage
(ARTHROPODA: Crustacea) 1. Larvae of Malacostraca with functional pleopods; also referred to as glaucothoe. 2. First postlarval stage in development of Eucarida, not ...
См. megapore.
see megalopa stage.
see macromere.
adj. [Gr. megas, large; meros, part] With relatively large parts; autosomes with large heterochromatic segments.
n. pl.; sing. -ium [Gr. megas, large; dim. nephros, kidney] (ANNELIDA: Oligochaeta) A pair of large nephridia in each segment of the body except, for first and last segments; ...
see macroplankton.
n. [Gr. megas, large; poros, pore] (MOLLUSCA: Polyplacophora) Large pore in the dorsal plate; associated with aesthete.
n. [Gr. megas, large; skleros, hard] (PORIFERA) A large structural spicule; see microsclere.
n. [Gr. megas, large; skolex, worm] (ANNELIDA: Oligochaeta) The single pair of prostates, tubular or racemose, opened to the exterior, along side of or together with the ...
see macroscopic.
adj. [Gr. megas, large] Pertaining to size variations in polymorphic forms; see epimegetic, eumegetic, hypomegetic.
Mehlis' glands
(PLATYHELMINTHES: Trematoda) Unicellular mucous and serous glands surrounding the ootype in the reproductive system.
n. [Gr. meion, smaller; kytos, container] Primary oocytes and spermatocytes.
n. [Gr. meion, smaller; L. Faunus, diety of herds and fields] Microscopic and small macroscopic fauna on the sea bottom.
adj. [Gr. meion, smaller; lekithos, egg yolk] Having little yolk.
n. [Gr. meion, smaller; meros, part] The condition of possessing fewer than the normal number of parts.
n.; pl. meioses [Gr. meiosis, to make smaller] Two successive cell divisions in the developing germ cells characterized by the pairing and segregation of homologous ...
meiotic drive
A meiotic mechanism of cell division resulting in two kinds of gametes produced by a heterozygote with unequal recovery.
n. [Gr. meion, smaller; thrix, hair] Loss of setae in ontogenetic development or of homologous setae in natural groups.
n. [Gr. melas, black] Blackness.
n. [Gr. melas, black] A term for a group of chemically ill-defined pigments, often found associated with protein, produced by insects and marine animals responsible for ...
n. [Gr. melas, black; ismos, denoting condition] 1. An excessive darkening of color owing to increased amounts of black pigment. 2. A certain percentage of individuals in a ...
adj. [Gr. melas, black; eidos, like] Looking black or dark.
adj. [Gr. meli, honey; phagein, to eat] Honeyeating; melivourous.
n. [Gr. melitta, honeybee; logus, discourse] The study of bees.
n. [Gr. melitta, honeybee; philos, love] (ARTHROPODA: Insecta) 1. A symbiont of social bees. 2. Any organism that must spend a portion of its life cycle in a bee colony. ...
see meliphagous.
n. [L. mel, honey; ferre, to bear] (ARTHROPODA: Insecta) Honey-makers; bees as a whole.
adj. [L. mel, honey; ferre, to bear] Honey producing.
adj. [L. mel, honey; sugere, to suck] Honey-sucking.
n. [L. membrum, part] A limb or organ.
n. [L. membrana, skin] A thin film of tissue.
n. [L. membrana, skin] Changed into a membrane.
adj. [L. membrana, skin] Consisting of membranes; soft and pliable; membranaceous.
membranous sac
(BRYOZOA: Stenolaemata) Membrane surrounding digestive and reproductive systems of zooid; the entosaccal and exosaccal cavity.
n. [L. dim. membrana, skin] (ARTHROPODA: Insecta) A small semi-opaque membrane on the base of the hind wing of certain Odonata.
См. membranula.
Mendel's laws of inheritance
Genetic principles proposed by Mendel; law of segregation and law of independent assortment.
Mendelian character
Character formed under the control of chromosomal genes.
Mendelian inheritance
Mode of inheritance from chromosomal genes.
Mendelian mutation
True gene mutation and recombination.
Mendelian population
A population with unrestricted interbreeding of organisms sharing a common gene pool.
n. [Gregor Mendel] Particulate inheritance of chromosomal genes.
adj. [Gr. meniskos, a crescent] 1. Crescent-shaped lens; concavo-convex lens; one side convex and the other concave. 2. With one side concave, crescent shape of water in ...
n. [Gr. menein, to remain; gnathos, jaw] (ARTHROPODA: Insecta) Having biting mandibles in both larval and adult stages. menognathous a; see Menorhyncha, metagnath.
n. pl. [Gr. menein, to remain; rhynchos, snout] (ARTHROPODA: Insecta) A former division of insects composed of those who ingest by suction in both larval and adult stages; ...
n. [Gr. menein, to remain; taxis, arrangement] Orientation in a fixed direction with respect to the stimulus.
meraspis larva
(ARTHROPODA: Trilobita) The second larval stage with the pygidium located behind the cephalon; the thoracic region will appear during succeeding molts; see holaspis larva. ...
see scatophagous.
see merus.
meridional canal
(CTENOPHORA) One of the eight canals extending in an oral-aboral direction under the external surface; part of the gastrovascular system; in Pleurobranchia it emits a ...
meristal annuli
(ARTHROPODA: Insecta) In Orthoptera and Odonata, annuli derived from, and adjacent to, the meriston that divides.
n. [L. merizein, to divide] (ARTHROPODA: Insecta) The most basal annulus of the antennal flagellum.
adj. [Gr. meros, part; trichos, hair] (ARTHROPODA: Chelicerata) In Acari, chaetotaxy characterized by a reduction in number and size of setae from the holotrichous form.
n. [Gr. mermis, cord; aner, male] (ARTHROPODA: Insecta) Male Formicidae parasitized by the nematode Mermis; a mermithophore.
n. [Gr. mermis, cord; ergates, worker] (ARTHROPODA: Insecta) In Formicidae, a worker parasitized by the nematode Mermis; a mermithophore.
adj. [Gr. mermis, cord] (NEMATA) Pertaining to parasitism by nematodes of the genus Mermis.
see mermithostratiote.
n. [Gr. mermis, cord; gyne, woman] (ARTHROPODA: Insecta) A female Formicidae parasitized by the nematode Mermis; a mermithophore.
n. [Gr. mermis, cord; pherein, to carry] (NEMATA) An anomalous form resulting from parasitism by the nematode Mermis; a mermithaner, mermithergate, mermithogyne, ...
n. [Gr. mermis, cord; stratiotes, soldier] (ARTHROPODA: Insecta) Soldier Formicidae parasitized by the nematode Mermis; a mermithophore.
mermitoid esophagus
see stichosome.
a; see holandry.
n. [Gr. meros, part; aner, male] The condition of possessing less than the normal number of testes.
meroblastic cleavage
Cleavage of a heavily yolked egg in which only the egg cell divides, leaving the yolk undivided.
n. [Gr. meros, part; keras, horn] (ARTHROPODA: Crustacea) The 4th segment of an antenna.
adj. [Gr. meros, part; krinein, to separate] The passing of a secretion by a gland in which the nucleus remains intact and thereby can recover; see holocrine.
see merus.
adj. [Gr. meros, part] (ANNELIDA: Oligochaeta) Pertaining to the excretory system with nephridial tubules formed by longitudinal or transverse fragmentation of the original ...
meroistic ovariole
(ARTHROPODA: Insecta) An ovariole in which nurse cells, or trophocytes are present; telotrophic (acrotrophic) and polytrophic types; panoistic; meroistic egg tube.
adj. [Gr. meros, part; mys, muscle] (NEMATA) Muscle arrangement with only a few, frequently only two, flat muscle cells seen in each quadrant of a cross section of the ...
n. [Gr. meros, upper thigh] (ARTHROPODA: Insecta) The posterior part of the basicoxite; in higher Diptera, separated from the coxa and forms part of the thoracic wall ...
see micronephridia.
n.; pl. -ura [Gr. meros, part; pleuron, side] (ARTHROPODA: Insecta) A sclerite composed of the meron of the coxa and the lower region of the epimeron.
n. [Gr. meros, part; pous foot] (ARTHROPODA) 1. The fourth segment of a generalized limb. 2. The femur in Chelicerata and Insecta. 3. For Crustacea see merus.
n. [Gr. meros, part; soma, body] A body segment; a somite or metamere.
n. [Gr. meros, part; sperma, seed] Fusion of an egg cell with a sperm that has lost its nucleus; therefore, it cannot take part in karyogamy with the egg nucleus.
n. [Gr. meros, part] (ARTHROPODA: Crustacea) The fourth segment of the mouth part, articulating with the ischium anteriorly and carpus posteriorly; a meropodite.
См. mesiad.
n. pl.; sing. mesadene [Gr. mesos, middle; aden, gland] (ARTHROPODA: Insecta) 1. Mesodermal accessory glands of male genitalia. 2. In some male Heteroptera, paired, highly ...
См. mesial.
mesal penellipse
(ARTHROPODA: Insecta) In larvae, a series of crochets covering at least the mesal half of the proleg, incomplete laterally; see penellipse.
mesanapleural suture
(ARTHROPODA: Insecta) In Diptera, a suture between the mesanepisternum and the meskatepisternum.
n. [Gr. mesos, middle; ana, up; epi, on; sternon, chest] (ARTHROPODA: Insecta) 1. In Diptera, the upper area of the mesepisternum separated from the meskatepisternum by the ...

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