Postsoma see metathorax

poststernellum see spinasternum poststigmatal primary tubercle (ARTHRO: Insecta) In caterpillars, a tubercle on the thorax.

postsynaptic a. [L. post, after; Gr. synapsis, union] Pertaining to structures or events on the receiving side of a synapse.

posttriangular cells see discoidal cell postuterine sac (NEMATA) A reduced, degenerate uterus nonfunctional in gamete production, usually posteriad to the vulva; may function as a storage organ for sperm in some species.

postvertical bristles (ARTHRO: Insecta) In Diptera, a pair of bristles behind the ocelli, generally on the posterior surface of the head.

postvulvar uterine branch see postuterine sac potamoplankton n. [Gr. potamos, river; plankton, wandering] Plankton of running water.

potential n. [L. potens, having power] In electrophysiology, the difference in charge between two points; usually in millivolts.

pouch n. [OF. poche] 1. A small or moderate size receptacle, sac or bag. 2. (ARTHRO: Insecta) In Hymenoptera, the food holder for bumblebee larvae. 3. (CNID: Scyphozoa) An extension of the stomach cavity.

pouch-makers (ARTHRO: Insecta) Bumblebee species that build special pollen-filled pouches next to groups of their larvae.

praecoxa n.; pl. -ae [L. prae, before; coxa, hip] (ARTHRO: Chelicerata) In arachnids, a term used instead of coxa in some groups.

praesoma n. [L. prae, before; Gr. soma, body] (ACANTHO) The proboscis, neck, and attached muscles and organs.

praniza n. (ARTHRO: Crustacea) In Isopoda, a parasitic larva of fishes in the suborder Gnathiidea.

prasinous a. [Gr. prasinos, leek green] Light green tending to yellow; the color of a leek.

pratinicolous n. [L. pratum, meadow; incola, inhabitant] Liv ing in meadows or bogs.

preadaptation n. [L. pre, before; adaptatus, fitted] The possession of the necessary genotypic or phenotypic properties that permit a shift into a new niche or habitat.

prealar arm (ARTHRO: Insecta) An extension in front of the wings connecting the prescutum with the pleuron; prealar bridge; prealare. see postalar arm.

prealar callus (ARTHRO: Insecta) In Diptera, a projection situated just above the root of the wing.

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