Plate organ see sensillum placodeum

plates n.pl. [L. plattus, flat] (ARTHRO: Insecta) In Diaspidinae, gland spines of the pygidium that are multiple branched, with or without a duct.

platyform larva (ARTHRO: Insecta) An extremely flattened larva; an onisciform larva.

Platyhelminthes n.pl. [Gr. platys, flat; helminthos, of worms] A phylum of acoelomate animals commonly called flat-worms, including the flukes, tapeworms and turbellarians.

platymyarian a. [Gr. platys, flat; mys, muscle] (NEMATA) Having fibers of the muscle cells adjacent and perpendicular to the hypodermis. see coelomyarian.

plectanes n. [Gr. plektos, twisted] (NEMATA) Cuticular plates that function as supports for the male genital papillae.

plectolophe n. [Gr. plektos, twisted; lophos, crest] (BRACHIO) A lophophore where each branchium has a U-shaped side arm with a double row of paired filamental appendages, terminating distally in a medial plano-spire normal to commissural plane with a single row of paired appendages. plectolophous a.

plectrum n. [L. plectrum, a tool for plucking a stringed instrument] (ARTHRO: Insecta) In Coleoptera, a single scraper used against a roughened file (strigil) that causes a membrane to vibrate and therefore produce sound.

plegma n.; pl. plegmata [Gr. plegma, plaited] (ARTHRO: Insecta) In scarabaeoid larvae, a single fold. see plegma-tium, proplegmatium.

plegmatium n.; pl. -tia [Gr. plegma, plaited] (ARTHRO: Insecta) In scarabaeoid larvae, a lateral paired area with a plicate, sclerotized surface, bordered by marginal pleg-mated spines with acanthoparia.

pleiomorphic, pleomorphic a. [Gr. pleion, more; morphe, form] Having the ability to change shape; polymorphic, or a type of polymorphism.

pleiomorphism, pleomorphism n. [Gr. pleion, more; mor-phe, form] 1. Polymorphism. 2. A type of polymorphism exhibited as several different stages in a life cycle.

pleiotrophy, pleiotropism n. [Gr. pleion, more; tropein, to turn] Multiple phenotypic effects of a single gene.

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