pangenesis n. [Gr. pan, all; genesis, origin] Darwin's pre-genetic hypothesis that somatic cells contain particles influenced by the environment that can move to the sex cells and influence heredity.
panmixia, panmixy n. [Gr. pan, all; mixis, a mixing] Random interbreeding in a population; nonselective breeding. pan-mictic a.
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 meroistic.
panthalassic a. [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 a. [Gr. pan, all; tropikos, turning] Denoting a thorough distribution in the tropics.
panzootic a. [Gr. pan, all; zoon, animal] Referring to a widespread disease of animals in a region; extensively epizootic.
papilioform a. [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. (ANN: Hirudinoidea) In leeches, a small to large protrusible sensory organ; metamerically arranged or scattered on the dorsal surface; large papillae are called tubercules. 3. (ARTHRO: Crustacea) Small steep-sided prominences on the valve surface of Os-tracods. 4. (ARTHRO: Insecta) A minute soft projection, a modified ligula of silk-spinning caterpillars. 5. (BRACHIO) Fine spines either solid or hollow on the inside of the shell;
endospines. 6. (ECHINOD) In holothurians and ophiuroids, tube foot with sensory function. 7. (ECHI) Wart-like or rounded tubercles on the surface of the body, maybe uniform over the surface, and are often associated with glandular cells. 8. (NEMATA) Pimple-like, simple sensory organs. 9. (PLATY: Trematoda) An accessory adhesive organ bearing a retractile tip. 10. (SIPUN) Variously shaped elevations of the surface of the trunk or introvert, usually associated with glandular cells.
papillae anales (ARTHRO: 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 eggs into plant tissue or into crevices.
papilla genitalis (ARTHRO: Insecta) An outgrowth containing the genital opening.
papillary a. [L. papilla, nipple] A small nipple-like process; minute nodes or bumps.
papillary sac (MOLL) The left nephridium with two nephridia; usually filled with projecting papillae.
papillate a. [L. papilla, nipple] Having surface elevations; papillose; verrucose.
papilliform a. [L. papilla, nipple; forma, shape] Shaped like a papilla.
papula n.; pl. -lae [L. papula, pimple] 1. An isolated pimple or small bump. 2. (ECHINOD: Asteroidea) Small finger-like projections arising between the body wall spines, mainly on the upper surface, that function in gas exchange and excretion.
papulous a. [L. papula, pimple] 1. Covered with small bumps or pimples. 2. (moll: 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 (ARTHRO: Crustacea) In Nephropidae, a carapace groove below, behind and almost parallel to the branchiocardiac and postcervical grooves and joining the postcervical in the lower part.
paracardo n. [Gr. para, beside; L. cardo, hinge] (ARTHRO: In-secta) A part of the basal sclerite of the cardo of the maxilla.
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