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Слова на букву ooec-phen (732)

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pad
n. [origin uncertain] (MOLLUSCA: Bivalvia) In oysters, a thin aragonite layer on which the adductor muscle is inserted.
paedogenesis
n. [Gr. pais, child; gennaein, to produce] 1. (ARTHROPODA: Insecta) Parthenogenetic reproduction by insect larvae structurally unable to copulate. 2. Progenesis; see ...
paedomorphosis
n. [Gr. pais, child; morphosis, shaping] Evolutionary change in which ancestrally immature structures are retained.
paedoparthenogenesis
see paedogenesis.
pagina
n. [L. pagina, leaf] (ARTHROPODA: Insecta) The surface of a wing; inferior= lower surface; superior= upper surface.
pagiopodous
adj. [Gr. pagios, solid; pous, foot] (ARTHROPODA: Insecta) In aquatic Hemiptera, refers to the posterior coxae having the articulation in the form of a hinge joint; see ...
paired
see didymous.
pairing
adj. [L. par, equal] Chromosome pairing, highly specific association (side by side) of homologous chromosomes.
pala
n.; pl. palae [L. pala, shovel] (ARTHROPODA: Insecta) In corixid Hemiptera, the tarsus modified as a hair-fringed scoop for particle feeding.
palaeartic region
A zoogeographical region encompassing Europe and northern Asia including Japan, the Middle and Near East and areas along the southern coast of the Mediterranean Sea.
palatal
adj. [L. palatum, palate] 1. Belonging to the outer lip. 2. (MOLLUSCA: Gastropoda) Referring to folds and lamellae of the shell.
palatal setae
(ARTHROPODA: Insecta) In Culicidae, four small peglike cibarial setae located on the anterior hard palate.
palate
n. [L. palatum, roof of the mouth] 1. (ARTHROPODA: Diplopoda) The endostome. 2. (ARTHROPODA: Insecta) The epipharynx. 3. (BRYOZOA: Gymnolaemata) In Cheilostomata, the ...
palatum
n. [L. palatum, roof of the mouth] (ARTHROPODA: Insecta) In Culicidae, the oral surfaces of the labrum and clypeus; divided into labropalatum and clypeopalatum.
palea
n.; pl. paleae [L. palea, chaff] (ANNELIDA: Polychaeta) A broad flattened seta used for burrowing.
paleospecies
n. [Gr. palaios, ancient; L. species, form] Fossils that are placed in a species because of similar appearance.
paleotropical
n. [Gr. palaios, ancient; tropos, turn] Of or pertaining to the tropical or subtropical regions of the old world.
palette
n. [L. pala, spade] (ARTHROPODA: Insecta) In males of Coleoptera, the modified cupule-bearing tarsus of an anterior leg.
pali
n. pl.; sing. palus [L. palus, stake] 1. (ARTHROPODA: Insecta) A straight or pointed spine. 2. (CNIDARIA: Anthozoa) Small ridges between the columella and septa of ...
palidium
n.; pl. -ia [L. dim palus, stake] (ARTHROPODA: Insecta) In scarabaeoid larvae, a paired group of spines placed either before the anus or from the ends of the anal slit; ...
paliform lobe
(CNIDARIA) A palus detached from the inner edge of a septum.
palingenesis
n. [Gr. palin, back; genesis, descent] 1. Characteristics of an individual that repeats the phylogenetic development of its taxon. 2. The regeneration or restoration of a ...
palintrope
n. [Gr. palin, back; tropos, turn] (BRACHIOPODA) The recurved part of the ventral valve that fills the gap between the beak and hinge line in the dorsal valve of some ...
palisade
n. [L. palus, stake] (ARTHROPODA: Insecta) The clear region formed around the rhabdom in a light-adapted eucone apposition eye when exposed to darkness.
pallets
n. pl. [L. dim. pala, spade] (MOLLUSCA: Bivalvia) Two variously shaped calcareous structures at the siphonal tip of some woodboring forms; abrading tools.
pallial
adj. [L. pallium, mantle] (MOLLUSCA) Of or pertaining to the mantle.
pallial artery
(MOLLUSCA) An artery that supplies blood to the mantle.
pallial chamber or cavity
(MOLLUSCA) The mantle cavity.
pallial complex
(MOLLUSCA) All of the organs of the mantle cavity combined (ctenidia, osphradia, anus, renal and genital openings and glands).
pallial curtain
(MOLLUSCA: Bivalvia) The inner fold of the mantle edge of oysters, with a row of tentacles, supplied with muscles and blood sinuses.
pallial duct
(MOLLUSCA: Gastropoda) Region of the genital duct that has undergone elaboration or differentiation to provide for sperm storage and egg membrane formation.
pallial groove
(MOLLUSCA: Polyplacophora) Ventral groove marking the separation between the foot and mantle.
pallial line
(MOLLUSCA: Bivalvia) A fine, single-lined impression near the periphery of each valve, produced by the edge of the mantle and indicating the internal line of attachment of ...
pallial markings
see vascular markings.
pallial nerves
(MOLLUSCA) The pair of large dorsal nerves that innervate the mantle.
pallial region
(MOLLUSCA: Bivalvia) Marginal region inside the shell next to the pallial line.
pallial retractor muscles
Muscles that withdraw the edge of the pallium into the shell.
pallial sinus
1. (BRACHIOPODA) see mantle canal. 2. (MOLLUSCA: Bivalvia) A notch or recess in the pallial line.
palliobranchial fusion
(MOLLUSCA: Bivalvia) Having the ctenidia outer tips fused to the mantle margin.
palliolum
n. [L. dim. pallium, mantle] (ARTHROPODA: Insecta) In Siphonaptera, the outer (external) wall of the aedeagus.
palliopedal
adj. [L. pallium, mantle; pedis, foot] (MOLLUSCA) Pertains to the mantle and foot.
pallioperitoneal
adj. [L. pallium, mantle; Gr. periteinein, to stretch around] (MOLLUSCA) Pertaining to a complex that includes heart, renal organs, gonads and ctenidia.
pallium
n. [L. pallium, mantle] 1. The mantle of a bivalve Mollusca or a Brachiopoda. 2. (ARTHROPODA: Insecta) In certain Orthoptera (Caelifera), a membrane from the free margin ...
palm
see manus.
palmaria
См. palmars.
palmars
see tertibrach.
palmate
adj. [L. palma, hand] 1. Digitate; parts arising from a common center; flat and wide with projections like fingers, as certain corals. 2. (PORIFERA) Megasclere with chela ...
Palmen's organ
(ARTHROPODA: Insecta) In Ephemeroptera, a cuticular nodule at the junction of four tracheae mid-dorsally behind the eyes of the adult and larva; may function as a ...
palmula
see pulvillus.
palp
n.; pl. -pi [L. palpus, feeler] 1. (ANNELIDA) adj. In Oligochaeta, one of a pair of elongate projections on the anal segment. b. In Polychaeta, one of a pair of projections ...
palp foramen
(ARTHROPODA: Crustacea) A small opening in the mandibular body.
palp proboscide
(MOLLUSCA: Bivalvia) A tentaculiform outgrowth on each outer labial palp that can extend into or on the substrate, where ciliated and glandular surfaces pick up particles ...
palp proboscis
См. palp proboscide.
palpation
n. [L. palpus, feeler] (ARTHROPODA: Insecta) The act of touching with labial or maxillary palps; serves as sensory probe or tactile signal to another insect.
palpifer
n. [L. palpus, feeler; ferre, to carry] (ARTHROPODA: Insecta) A small lobe of the maxillary stipes to which the maxillary palpus (palp) articulates; palpiferous a; see ...
palpiform
adj. [L. palpus, feeler; forma, shape] Shaped like a palpus.
palpiger
n. [L. palpus, feeler; gerere, to carry] (ARTHROPODA: Insecta) A lobe of the mentum of the labium that bears the palpus; see palpifer.
palpimacula
n. [L. palpus, feeler; macula, spot] (ARTHROPODA: Insecta) A sensory area on the labial palps of certain insects.
palpon
see dactylozooid.
palpus
См. palp.
paludicole
adj. [L. paludis, marsh; colere, to inhabit] Living in or frequenting marshes.
palule
n. [L. palus, stake] (CNIDARIA) A detached calcareous process of corals.
palus
n.; pl. -li [L. palus, stake] 1. A stake-like structure. 2. (CNIDARIA) A verticle column along the inner edge of some septa.
pandemic
adj. [Gr. pan, all; demos, people] A widespread epidemic; see eumenical, cosmopolitan, endemic.
panduriform
adj. [L. pandura, musical instrument; forma, shape] Violin-shaped, oblong at the two extremities and contracted in the middle; pandurate.
Pangaea
n. [Gr. pan, all; gaia, earth] The theory of an ancient continent from which the present continents split off by continental drift.
pangamy
see panmixia.
pangenesis
n. [Gr. pan, all; genesis, origin] Darwin\'s pregenetic hypothesis that somatic cells contain particles influenced by the environment that can move to the sex cells and ...
panmixia
См. panmixy.
panmixy
n. [Gr. pan, all; mixis, a mixing] Random interbreeding in a population; nonselective breeding; panmictic adj..
panoistic ovariole
Ovarioles that have no specialized nurse cells and are of a primitive type; germ cells occurring without interruption from one end to the other; panoistic egg tube; see ...
panthalassic
adj. [Gr. pan, all; thalassa, sea] Living in coastal and offshore waters.
pantherine
n. [L. pantherinus, panther-like] Spotted like a panther; similar in color to cervinus.
pantropical
adj. [Gr. pan, all; tropikos, turning] Denoting a thorough distribution in the tropics.
panzootic
adj. [Gr. pan, all; zoon, animal] Referring to a widespread disease of animals in a region; extensively epizootic.
papilioform
adj. [L. papilio, butterfly; forma, shape] Resembling a butterfly wing.
papilla
n., pl. -lae [L. papilla, nipple] 1. A nipplelike elevation, generally sensory in function. 2. (ANNELIDA: Hirudinoidea) In leeches, a small to large protrusible sensory ...
papilla genitalis
(ARTHROPODA: Insecta) An outgrowth containing the genital opening.
papillae anales
(ARTHROPODA: Insecta) In female Lepidoptera, a pair of soft hairy lobes that flank the genital opening, sometimes modified and heavily sclerotized for the insertion of the ...
papillary
adj. [L. papilla, nipple] A small nipple-like process; minute nodes or bumps.
papillary sac
(MOLLUSCA) The left nephridium with two nephridia; usually filled with projecting papillae.
papillate
adj. [L. papilla, nipple] Having surface elevations; papillose; verrucose.
papilliform
adj. [L. papilla, nipple; forma, shape] Shaped like a papilla.
pappus
n. [L. papus, down] Down.
papula
n.; pl. -lae [L. papula, pimple] 1. An isolated pimple or small bump. 2. (ECHINODERMATA: Asteroidea) Small finger-like projections arising between the body wall spines, ...
papulous
adj. [L. papula, pimple] 1. Covered with small bumps or pimples. 2. (MOLLUSCA: Gastropoda) The operculum of some Neritidae.
parabiosis
n. [Gr. para, beside; biosis, manner of life] A form of symbiosis where animals of two or more species live together amicably, but keep their broods separate.
parabranchial groove
(ARTHROPODA: Crustacea) In Nephropidae, a carapace groove below, behind and almost parallel to the branchiocardiac and postcervical grooves and joining the postcervical in ...
paracardo
n. [Gr. para, beside; L. cardo, hinge] (ARTHROPODA: Insecta) A part of the basal sclerite of the cardo of the maxilla.
paraclypeus
see mandibular plate.
paracme
n. [Gr. parakme, decadence] The state of decline of a group of organisms after the highest stage of development (acme); see phylogerontic.
paracopulatory organ
(ARTHROPODA: Crustacea) In Isopoda, a specialized endopod of the pleopod utilized in copulation.
paracymbium
n. [Gr. para, beside; kymbion, small boat] (ARTHROPODA: Chelicerata) In mature male Arachnida, a genital appendage arising from the base of the cymbium in many groups.
parademe
n. [Gr. para, beside; demas, body] A secondary apodeme arising from the edge of a sclerite.
paraderm
see pronymphal membrane.
paradigm
n. [Gr. para, beside; deigma, example] An example, pattern, or model.
paraerucism
n. [Gr. para, beside; L. eruca, caterpillar] (ARTHROPODA: Insecta) Poisoning by hairless caterpillars with secretions by specialized glands; see lepidopterism.
parafaciala
n. pl. [Gr. para, beside; L. facies, face] (ARTHROPODA: Insecta) In Diptera, that portion of the face between the facial ridges and the eyes; see gena.
parafrontals
see genovertical plate.
paragaster
see spongocoel.
paragastrula
n. [Gr. para, beside; dim. gaster, stomach] (PORIFERA) The gastrula formed by invagination of the flagellate cells of a amphiblastula.
parageneon
n. [Gr. para, beside; genos, descent] A littlechanging species that embraces some aberrant genotypes.
paragenetic
adj. [Gr. para, beside; genesis, descent] A chromosome change that influences the expression of a gene but not structure.
paraglossa
n.; pl. -ae [Gr. para, beside; glossa, tongue] (ARTHROPODA: Insecta) One of a pair of terminal lingular lobes of the labium that arise distal to the postmentum.
paragnath
n.; pl. -naths [Gr. para, beside; gnathos, jaw] 1. Any part or structure that lies alongside a jaw or palp. 2. (ANNELIDA: Polychaeta) One of a pair of chitinous jaws. 3. ...
paragula
n. [Gr. para, beside; gula, throat] (ARTHROPODA: Insecta) In some Coleoptera larvae, a paired, elongate sclerite on either side of the gula.
parahemizonid
n. [Gr. para, beside; hemisys, half; L. zona, girdle] (NEMATODA: Secernentea) A hemizonion or other similar structure.
paralabial areas
(ARTHROPODA: Insecta) In aquatic Diptera larvae that possess a labial plate, a pair of areas lateral to the base of the labial plate.
paralectotype
n. [Gr. para, beside; lektos, choose; typos, type] Any of the remaining syntypes after the selection of a lectotype.
paralimnion
n. [Gr. para, beside; limne, pond] The shore area of lakes.
parallel mandibles
(ARTHROPODA: Insecta) In Diptera larva, parallel mouth-hooks that move dorsoventrally.
paramentum
n. [Gr. para, beside; L. mentum, chin] (ARTHROPODA: Insecta) In Coleoptera, paired, usually elongate, sclerite on either side of the mentum.
paramera
see parameres.
parameral lobes
(ARTHROPODA: Insecta) In scarabaeoid beetles, lobe-shaped expansions at the distal end of a paramere.
parameres
n. pl. [Gr. para, beside; meros, part] 1. The right or left halves of a bilaterally symmetrical animal. 2. (ARTHROPODA: Insecta) The outer pair of phallomeres that develop ...
paranal
adj. [Gr. para, beside; L. anus, anus] To the side of or next to an anal structure.
paranal lobes
see paraprocts.
paraneural muscle
(SIPUNCULA) Paired longitudinal muscles on each side of the anterior portion of the nerve cord.
paranota
n. pl.; sing. paranotum [Gr. para, beside; notos, back] (ARTHROPODA) Lateral extension of the tergite or pleurotergite in Diplopoda and Insecta; paranotal expansions or ...
paranuclear body
see centrosome.
parapatric speciation
Populations in geographical ranges that come in contact and genetic interchange is possible even without sympatry; see dichopatry.
parapet
see collar.
parapharynx
see hypopharynx.
paraphyletic
adj. [Gr. para, beside; phyletes, tribesman] A monophyletic group that does not contain all of the descendants of the most recent common ancestor of that group.
paraphysis
n.; pl. -yses [Gr. para, beside; physis, growth] (ARTHROPODA: Insecta) In Coccoidea, the chitinized thickenings, lateral ingrowths, or projections near the base of the ...
parapleurolophocercous cercaria
see pleurolophocercous cercaria.
parapleuron
n.; pl. -ura [Gr. para, beside; pleuron, side] (ARTHROPODA: Insecta) In Coleoptera, the undivided pleura of the thorax.
paraplicate folding
(BRACHIOPODA) A fold on either side of the dorsal sulcus on the brachial valve.
parapod
См. parapodium.
parapodium
n.; pl. -dia [Gr. para, beside; pous, foot] 1. (ANNELIDA: Polychaeta) Paired lateral, fleshy, paddle-like appendages that bear one or more cirri; usually consisting of two ...
parapolar cells
(MESOZOA) Cells making up the ciliated somatoderm behind the calotte.
paraproct
n. [Gr. para, beside; proktos, anus] (ARTHROPODA) One of a pair of plates, valves or lobes bordering the anus lateroventrally in some Insecta, Chelicerata, and Diplopoda; ...
parapsidal
see parapsis.
parapsidal furrow
(ARTHROPODA: Insecta) The longitudinal groove on each side of the mesonotum, lying near to the lateral margin and separating the parapsides from the main mesonotal plate.
parapsidal grooves
see parapsidal furrow.
parapsidal suture
(ARTHROPODA: Insecta) A longitudinal suture of the mesonotum separating the median area from the lateral area.
parapsis
n.; pl. -sides [Gr. para, beside; hapsis, arch] (ARTHROPODA: Insecta) In Hymenoptera, side pieces of the scutellum separated from the median area by the parapsidal furrow ...
paraptera
see tegulae.
parasagittal
adj. [Gr. para, beside; sagitta, arrow] A plane parallel to the sagittal plane.
parascolus
n. [Gr. para, beside; skolos, thorn] (ARTHROPODA: Insecta) In Coleoptera ladybird beetle larvae, a modification of the scolus in which the projection is 2-3 times as long as ...
parascutal area
see alar area.
parasematic
adj. [Gr. para, beside; sema, sign] Pertaining to colors, structures or behavior that deceive preditors; see antiaposematic, sematic.
parasexual
adj. [Gr. para, beside; LL. sexualis, sexual] Refers to all non-meiotic reproductive processes.
parasigmoidal
adj. [Gr. para, beside; sigma, the 16th letter; eidos, form] Curved like a reversed letter "S.".
parasite
n. [Gr. para, beside; sitos, food] An organism that lives part or all of its life in or on the body of another living organism (host), obtaining nutriment from the latter, or ...
parasitic castration
Pertaining to the suppression or destruction of gonads by parasites; first used regarding Crustacea; individual parasitic castration; see social parasitic castration.
parasiticide
adj. [Gr. para, beside; sitos, food; L. caedare, to kill] Distructive to parasites; parasiticidal.
parasitism
n. [Gr. para, beside; sitos, food] A form of symbiosis in which the symbiont benefits from the association and causes detriment to the host.
parasitization
n. [Gr. para, beside; sitos, food] The act of an organism taking food from the body of another organism (host) for the completion of its life cycle; usually detrimental to ...
parasitoid
n. [Gr. para, beside; sitos, food; eidos, form] 1. Any organism that is typically parasitic in its development, but kills the host during or at the completion of its ...
parasitology
n. [Gr. para, beside; sitos, food; logos, discourse] The study of parasites.
parasitophorous vacuole
A vacuole within a host cell containing a parasite.
parasocial
adj. [Gr. para, beside; socius, companion] (ARTHROPODA: Insecta) Referring to forms that show one or more of the following traits: cooperation in care of the young, ...
parastipes
see subgalea.
parasulcate folding
(BRACHIOPODA) With a sulcus on either side of the median fold of the brachial valve.
parasymbiosis
see neutralism.
parasyndesis
n. [Gr. para, beside; syndesis, binding together] Parasynapsis; union of chromosomes side-to-side in the process of meiosis; see acrosyndesis.
paratenic host
A host harboring a parasite that does not undergo further development and is generally of ecologic advantage in the disease cycle.
paratergite
see laterotergite.
parathyridium
n.; pl. -dia [Gr. para, beside; dim. thyris, window] (BRACHIOPODA) Deep indentation of both valves on either side of the beak; most pronounced in the dorsal valve.
paratomy
n. [Gr. para, beside; tomos, cut] (ANNELIDA) Designating the reproduction by fission with regeneration following preparatory internal tissue reorganization; see ...
paratopotype
n. [Gr. para, beside; topos, place; typos, type] A paratype recovered from the same locality as the holotype.
paratroch
see telotroch.
paratrophic
adj. [Gr. para, beside; trophe, food] Deriving food parasitically.
paratype
n. [Gr. para, beside; typos, shape] A specimen collected at the same time as the holotype and was so designated or indicated by the original author.
parauterine organ
see paruterine organ.
paraxial
adj. [Gr. para, beside; L. axis, axle] 1. To move parallel to the body axis. 2. par-axial (ARTHROPODA: Chelicerata) In spiders, pertaining to chelicerae with the paturon ...
paraxial organs
(ARTHROPODA: Chelicerata) Special gland pockets that produce the spermatophores of male Scorpions.
paraxon
n. [Gr. para, beside; axon, axle] The collateral branch of an axon.
Parazoa
n. [Gr. para, beside; zoon, animal] A subkingdom containing Porifera; the sponges.
parazoeal
adj. [Gr. para, beside; zoe, life] (ARTHROPODA: Crustacea) In Bathynellacea, postembryological development (larval) phase, quite often completed in the egg.
parcidentate
adj. [L. parcus, sparing; dens, tooth] Having few teeth.
parecium
n. [Gr. para, beside; oikos, house] (ARTHROPODA: Insecta) Air space surrounding a fungus garden in the nest of Isoptera.
parenchyma
n. [Gr. para, beside; NL. enchyma, type of cell tissue] Undifferentiated tissue between organs in various invertebrates; parenchymatous adj..
parenchymalia
n. pl. [Gr. para, beside; NL. enchyma, type of cell tissue] (PORIFERA: Hexactinellida) Spicules scattered throughout the parenchyma, consisting of hexactines, diactines, ...
parenchymella
n. [Gr. para, beside; NL. enchyma, type of cell tissue] (PORIFERA) A solid, ciliated larva; a stereogastrula.
parenchymula
См. parenchymella.
paria
n.; pl. -ae [Gr. pareion, cheek] (ARTHROPODA: Insecta) In scarabaeoid larvae, the lateral paired region of the epipharynx from the clithrum, or epizygum and haptomerum ...
paries
n.; pl. parietes [L. paries, wall] 1. A wall; any wall of a part, cavity or hollow organ. 2. (ARTHROPODA: Crustacea) The median part of every compartmental plate of ...
parietal
adj. [L. paries, wall] 1. (ARTHROPODA: Crustacea) Of or pertaining to paries. 2. (ARTHROPODA: Insecta) Referring to the dorsal sclerites of the cranium, between the ...
parietal callus
(MOLLUSCA: Gastropoda) A thickening of the inner lip.
parietal fold
(MOLLUSCA: Gastropoda) A spiral ridge on the parietal region projecting into the interior of the shell.
parietal lip
(MOLLUSCA: Gastropoda) A part of the inner lip on the parietal region.
parietal muscles
(BRYOZOA) Generally multiple, bilaterally paired muscles that insert on the front wall or floor of the ascus; usually functioning in the hydrostatic system.
parietal pore
1. (ARTHROPODA: Crustacea) see longitudinal tube. 2. (BRYOZOA: Gymnolaemata) A hole in the distal wall of the zooecium allowing communicating fibers between polypides.
parietal region
(MOLLUSCA: Gastropoda) The basal surface of the helical spiral shell located within and without the aperture.
parietal ridge
(MOLLUSCA: Gastropoda) The prominence on the parietal lip near the adapical corner of the aperture.
parietal septum
see longitudinal septum.
parietal tube
see longitudinal tube.
parietal wall
see parietal region.
parieto-basilar muscles
(CNIDARIA: Anthozoa) Muscles on the column of Actinaria that run obliquely from the outer ends of the mesenteries near the base on to the central parts of the pedal disk; ...
parivincular
adj. [L. par, equal; vinculum, bond] (MOLLUSCA: Bivalvia) Having a ligament similar to a cylinder split on one side, attached by several edges (nymphae), with one edge to ...
parocciput
n. [Gr. para, beside; L. occiput, back of head] (ARTHROPODA: Insecta) A thickening of the occiput for articulation of the cervical sclerites.
paronychium
n.; pl. -ia [Gr. para, beside; onykos, claw] (ARTHROPODA: Insecta) A bristle-like appendage on the pulvillus between the tarsal claw.
pars
n.; pl. partes [L. pars, part] A part of an organ.
pars ampullaris
(ARTHROPODA: Crustacea) In Malacostraca (Hoplocarida and Anaspidacea), a bottle-shaped structure at the entrance of the digestive glands into the pyloric chamber of the ...
pars basalis
see cardo.
pars bothrialis
(PLATYHELMINTHES: Cestoda) In Trypanorhyncha, a division of the scolex from the anterior end to the hind margin of the bothridia.
pars bulbosa
(PLATYHELMINTHES: Cestoda) In Trypanorhyncha, a division of a scolex extending the length of the bulbs at the tentacle base.
pars incisiva
see incisor process.
pars intercerebralis
(ARTHROPODA: Insecta) A group of neurosecretory cells near the midline on each side of the brain from which secretions promote the functioning of the prothoracic glands, ...
pars molaris
see molar process.
pars postbulbosa
(PLATYHELMINTHES: Cestoda) In Trypanorhyncha, a division of the scolex from the hind margin of the tentacular bulb to the posterior end of the scolex.
pars prostatica
(PLATYHELMINTHES: Cestoda) Dilation of the ejaculatory duct encircled by unicellular prostate cells.
pars stipitalis labii
see prementum.
pars stridulans
see strigil.
pars vaginalis
(PLATYHELMINTHES: Cestoda) In Trypanorhyncha, a division of the scolex from the anterior end to the anterior end of the tentacular bulbs.
parsimony
n. [L. parsimonia, frugality] Economizing in assumption of reasoning.
parthenapogamy
n. [Gr. parthenos, virgin; apo-, separate; gamein, to marry] Diploid parthenogenesis.
parthenita
n.; pl. -ae [Gr. parthenos, virgin] (PLATYHELMINTHES: Trematoda) The unisexual stage in an intermediate host.
parthenogenesis
n. [Gr. parthenos, virgin; genesis, origin] The development of an individual from an unfertilized egg.
parthenogenetic
a; see arrenotoky, thelyotoky.
parthenogenone
n. [Gr. parthenos, virgin; genesis, origin; on, being] A parthenogenetic organism; parthenogone; see parthenote.
parthenote
n. [Gr. parthenos, virgin] A haploid organism produced parthenogenetically.
partial coverage
see valve coverage.
particulate inheritance
Mendel\'s theory that inheritance in an individual has distinct genetic factors from paternal and maternal forebearers.
partite
adj. [L. partitus, divided] Divided; separated; parted.
parturition
n. [L. parturire, to bring forth] The act of giving birth.
paruterine organ
(PLATYHELMINTHES: Cestoda) In Paruterininae, fibromuscular appendage that receives and stores the eggs, replacing the uterus.
parva stage
(ARTHROPODA: Crustacea) In Decapoda Caridea, the first postlarval stage.
parviconoid
adj. [L. parvus, small; conus, cone] Resembling a small cone.
pastinum
n. [L. pastinum, two pronged tool] (ARTHROPODA: Crustacea) In male Ostracoda, chitinized skeletal rods (caudually fork-shaped) that support the entire copulatory complex.
patabionts
see cryptozoa.
patagium
n.; pl. patagia [L. patagium, border] (ARTHROPODA: Insecta) 1. In Lepidoptera, a pair of articulated, thin, lobelike erectile expansions (overlapping plates) of the ...
patella
n.; pl. -lae [L. patella, small pan] 1. The knee cap. 2. (ARTHROPODA: Chelicerata) a. In Arachnida, a leg segment between the femur and tibia (the 4th segment). b. For ...
patellar
adj. [L. patella, small pan] 1. Pertaining to the patella; a small pan; a kneepan. 2. (MOLLUSCA: Cephalopoda) The saucershape, typical of Patellacea.
patent
adj. [L. patens, lying open] Open; diverging; expanded; spreading apart; see prepatent period.
pathogen
n. [Gr. pathos, suffering; gennaein, to produce] 1. A disease causing microorganism. 2. A parasite causing injury to a host.
pathogenesis
n. [Gr. pathos, suffering; genesis, origin] The origination and development of disease; pathogenic adj..
pathognomonic
adj. [Gr. pathos, suffering; gnom, sign] A diagnostic symptom by which a disease may be recognized.
pathology
n. [Gr. pathos, suffering; logos, discourse] The study of diseases; pathological adj..
patocoles
n. pl. [Gr. patos, bottom; L. colere, to dwell] Animals that spend part of their time dwelling in the cryptosphere but emerge to hunt and mate.
patronymic
adj. [Gr. pater, father; onyma, name] In nomenclature, a name based on that of a person.
patulous
adj. [L. patulus, standing open] Spreading; expanded; distended; having a wide aperture.
paturon
n. [Gr. patein, to trample on; oura, after part] (ARTHROPODA: Chelicerata) In Acarina, a structure on the chelicera bearing numerous toothlike projections; rastellum.
paucispiral
adj. [L. paucus, few; spira, coil] With relatively few whorls; oligogyral.
paunch
see crop.
Paurometabola
n. [Gr. pauros, little; metabole, change] (ARTHROPODA: Insecta) A division of the Heterometabola.
paurometabolous
adj. [Gr. pauros, little; metabole, change] (ARTHROPODA: Insecta) Having slight metamorphosis, the young and adults living in the same habitat, and the adults have wings; ...
Pauropoda
n. [Gr. pauros, little; pous, foot] (ARTHROPODA) Blind myriapoda, having 9-11 leg-bearing trunk segments, belonging in the phylum Arthropoda.
paurostyle
n. [Gr. pauros, little; stylos, pillar] (BRYOZOA: Stenolaemata) A type of stylet of cryptostomates with an irregular rod of nonlaminated material, with laminae weakly ...
Pavan's gland
(ARTHROPODA: Insecta) A gland of many Dolichoderine, associated with a conspicuous palisade epithelium on the 7th sternum that functions to secrete a pheromone trail; a ...
Pawlowsky's glands
(ARTHROPODA: Insecta) In Siphunculata, a pair of glands that open into the stylet sac and possibly function to lubricate the stylets.
paxilla
n.; pl. -lae [L. paxillus, a peg] 1. A small spine or peg. 2. (ECHINODERMATA: Asteroidea) A raised ossicle on the aboral surface, crowned with small movable spines or ...
Pearman's organ
(ARTHROPODA: Insecta) A rugose area adjacent to a membranous tympanum on the inner side of the hind coxae of Psocids, thought to be a stridulatory organ.
pecilonymy
n. [Gr. poikilo, varied; onyma, name] 1. The use of two or more terms to indicate the same thing. 2. A synonym, i.e., a systematic name, as of a species or genus, being ...
pecking order
see hierarchy.
pecten
n.; pl. pectines [L. pecten, comb] 1. Any comb- or rake-like structure. 2. (ARTHROPODA: Chelicerata) In Scorpiones, one of a pair of appendages on the somite immediately ...
pectina
n.; pl. -ae [L. pecten, comb] (ARTHROPODA: Insecta) One of the broad fringed plates on the pygidium of coccids.
pectinate
adj. [L. pecten, comb] 1. Having branches or processes like a comb. 2. Of claws; having teeth.
pectinate chaeta
(ANNELIDA: Oligochaeta) Crochet seta with two lateral teeth with several fine teeth between.
pectinations
n. pl. [L. pecten, comb] (MOLLUSCA: Polyplacorphora) Small sharp teeth on the outer edges of the insertion plates.
pectunculate
adj. [L. pecten, comb; -unculus, little] Having a row of minute appendages; pectunculoid.
pectus
n. [L. pectus, breast] (ARTHROPODA) A sclerite composed of pleuron fused with the sternum.
pedal
adj. [L. pedis, foot] Pertaining to a footlike appendage.
pedal disc
(CNIDARIA: Anthozoa) In Actinaria, the base or foot.
pedal elevator muscle
(MOLLUSCA: Bivalvia) Muscle fibers attached in the umbonal cavity that raise the foot.
pedal gape
(MOLLUSCA: Bivalvia) Opening between shell valves that allows extension of the foot.
pedal glands
(ROTIFERA: Bdelloidea) Glands in the retractile foot, opening through the toes, that secrete an adhesive to attach the animal to the substrate while feeding.
pedal groove
(MOLLUSCA: Solenogastres) A longitudinal fold or folds with ciliated and secretory cells in the median ventral position.
pedal levator muscle
see pedal retractor muscle.
pedal lobe
(ARTHROPODA: Insecta) A fleshy, bump-like, non-segmented rudimentary leg of a larva.
pedal pit
(MOLLUSCA: Solengastres) A ciliated pit containing secretory cells at the anterior end of the pedal groove.
pedal protractor muscle
(MOLLUSCA: Bivalvia) The muscle that extends the foot.
pedal retractor muscle
(MOLLUSCA: Bivalvia) The muscle attached to the shell that withdraws the foot; pedal levator muscle.

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