Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 655shape] Violin-shaped, oblong at the two extremities andcontracted in the middle; pandurate.Pangaea n. [Gr. pan, all; gaia, earth] The theory of an ancientcontinent from which the present continents split off bycontinental drift.pangamy see panmixiapangenesis n. [Gr. pan, all; genesis, origin] Darwin's pregenetichypothesis that somatic cells contain particles influencedby the environment that can move to the sex cellsand influence heredity.panmixia, panmixy n. [Gr. pan, all; mixis, a mixing] Randominterbreeding in a population; nonselective breeding. panmictica.panoistic ovariole Ovarioles that have no specialized nursecells and are of a primitive type; germ cells occurring withoutinterruption from one end to the other; panoistic eggtube. see meroistic.panthalassic a. [Gr. pan, all; thalassa, sea] Living in coastaland offshore waters.pantherine n. [L. pantherinus, panther-like] Spotted like apanther; similar in color to cervinus.pantropical a. [Gr. pan, all; tropikos, turning] Denoting athorough distribution in the tropics.panzootic a. [Gr. pan, all; zoon, animal] Referring to a widespreaddisease of animals in a region; extensively epizootic.papilioform a. [L. papilio, butterfly; forma, shape] Resemblinga butterfly wing.papilla n., pl. -lae [L. papilla, nipple] 1. A nipplelike elevation,generally sensory in function. 2. (ANN: Hirudinoidea) Inleeches, 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 Ostracods.4. (ARTHRO: Insecta) A minute soft projection, amodified ligula of silk-spinning caterpillars. 5. (BRACHIO)Fine spines either solid or hollow on the inside of the shell;