pore-chambers (BRYO) Small chambers where new zooids are budded in the angles between the lateral and basal walls that are connected to the intrazooidial pores.
pore diaphragm (PORIF) The closure of the porocyte.
pore plates 1. (ARTHRO: Insecta) In the soft scale Towmeyella parvicornis , groups of invaginated, biocular pores on the dorsal surface of the derm. see sensilla placodea. 2. (BRYO: Gymnolaemata) An interior chitinous or calcareous wall of a zooid with one or more minute pores through which special cells project; part of the communication organ.
pore space The insterstice between soil particles.
Porifera n. [Gr. poros, channel; L. ferre, to bear] Phylum of aquatic animals commonly called sponges; lacking organized tissues and a digestive cavity.
poriferous a. [Gr. poros, channel; L. ferre, to bear] Having numerous openings.
poriform a. [Gr. poros, channel; L. forma, shape] Resembling a pore; poroid.
porocalyx n. [Gr. poros, channel; kalyx, cup] (PORIF: Demospongiae) In some Spirophorida, a specialized, sunken, inhalant and exhalant aperture.
porocyte n. [Gr. poros, channel; kytos, container] (PORIF) Pinacocytes enclosing a pore that functions as an inhalant canal.
poroid a. [Gr. poros, channel; eidos, like] Pore-like; poriform.
porophore n. [Gr. poros, channel; phorein, to carry] (ANN: Oligochaeta) Any area, protuberance or special structure bearing a pore.
porose a. [Gr. poros, channel] Containing pores; porous; perforate.
porose area (ARTHRO: Chelicerata) Depressed areas on the capitulum of certain mites and ticks.
porphyrins n.pl. [Gr. porphyra, purple] Four pyrrole rings associated with various metals forming chlorophyll, hemoglobin, etc.
porrect a. [L. por, before; regere, to stretch] Elongated forward; stretched out horizontally.
portal of entry Point at which the invading parasite enters the body of an animal; through either natural or unnatural openings.
position effect The difference in the phenotypic expression of a gene due to a change in their position with respect to other genes on the chromosome.
positive geotropism Attraction toward the center of the earth.
positive tropism/taxis The tendency to be attracted to a source of stimulus.
postabdomen n. [L. post, after; abdomen, belly] 1. (ARTHRO) The usually slender, modified posterior segment of the abdomen of Crustacea and Insecta. 2. (ARTHRO: Chelicerata) The anal tubercle in spiders; in scorpions the metasoma or posterior narrower five segments of the abdomen. see tel-son.
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