Proximal sensory area see haptolachus

prozona n. [Gr. pro, before; zone, belt] (ARTHRO: Insecta) The anterior part of the pronotum. see mesozona, metazona.

prozonite n. [Gr. pro, before; zone, belt] (ARTHRO: Diplopoda) The anterior portion of a diplosomite, when the tergum is divided by a transverse groove. see metazonite.

pruinescence n. [L. pruinosus, frosty] (ARTHRO: Insecta) A 'bloom' covering of whitish or waxy particles. pruinose a.

Przibram's rule An empirical law of growth; as the volume increases by the cube of a number, the area increases by the square; 1.26 or V2.

psammon n. [Gr. psammos, sand] Freshwater or marine organisms living between sand grains; mesopsammon. psammous a.

psammophilous a. [Gr. psammos, sand; philos, loving] Living in or growing in sandy areas or sand; arenicolous. psam-mophile n.

psammophore n. [Gr. psammos, sand; phoreus, bearer] (AR-THRO: Insecta) In Formicidae, fringes of long hairs on the posterior surface of the head.

pseudanal segment (ARTHRO: Chelicerata) In acariform Acari, segment XIII and one of the paraproctal segments.

pseudaposematic/pseudoaposematic color Mimicry of coloration or form of another organism possessing dangerous or disagreeable qualities; Batesian mimicry; allosematic color. see sematic.

pseudarolium n.; pl. -olia [Gr. pseudos, false; arole, protection] (ARTHRO: Insecta) 1. A pad at the apex of the tarsus, similar to an arolium. 2. In Miridae Hemiptera, a more lateral pair of processes present in some subfamilies at the bases of the claws.

pseudepipod(ite) n. [Gr. pseudos, false; epi, upon; pous, foot] (ARTHRO: Crustacea) In Cephalocardia, the lateral lobe arising from the distal point of the exopod.

pseudepisematic color Having mimicry coloration for attrac-tant or aggressive purposes. see episematic, sematic.

pseudergate n. [Gr. pseudos, false; ergates, worker] (ARTHRO: Insecta) In Kalotermes Isoptera, a larval form functionally equivalent to the worker caste in other species, but remains able to develop into other castes.

pseudibacus n. [Gr. pseudos, false; bacca or baca, pearl] (ARTHRO: Crustacea) Postlarval stage of decapod Scyllaridae; nisto; puerulus.

pseudoacrorhagi; sing. -us [Gr. pseudos, false; acron, top; rhax, berry] (CNID: Anthozoa) In some Actiniaria, hollow, foliose expansions without nematocysts.

pseudoalleles [Gr. pseudos, false; allelon, one another] Genes at closely adjacent loci that react in the allelism test as they were alleles and between which crossing over is rare.

pseudocardinal a. [Gr. pseudos, false; L. cardinalis, chief] (MOLL: Bivalvia) Pertaining to irregularly shaped teeth close to the beak.

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