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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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680Maggenti and Gardnermostly within the ventral umbo.peronium n.; pl. -ia [Gr. perona, fibula] (CNID: Hydrozoa)Thick epidermal tract from the base <strong>of</strong> the tentacle on tothe bell.peroral a. [L. per, through; os, mouth] By way <strong>of</strong>, or throughthe mouth.perradius n.; pl. -ia [L. per, through; radius, ray] In Echinodermataand Cnidaria, body parts and organs located alonga limited number <strong>of</strong> radial planes; primary or 1st order radius.pervious a. [L. per, through; via, way] Perforate or open.petaloid a. [Gr. petalon, leaf] Resembling petals.petasma n. [Gr. petasma, something spread out] (ARTHRO:Crustacea) Complex male copulatory organs with couplinghooks on the first pair <strong>of</strong> pleopods.petiole n. [L. petiolus, little foot] 1. A stock or stem. 2. (AR-THRO: Insecta) a. In Hymenoptera Apocrita, the narrowconstricted zone at the base <strong>of</strong> the gaster. b. In Formicidae,a one or two segmented pedicel. petiolate a., petioliforma.petraliiform colony (BRYO: Gymnolaemata) In Cheilostomata,encrusting unilaminate colony loosely attached by the protrudingbasal walls <strong>of</strong> zooids or by basally budded kenozooids.petricolous a. [L. petra, rock; colere, to inhabit] Dwellingwithin stones, crevices or in hard clay.pH A symbol <strong>of</strong> a scale measuring the acidity or alkalinity <strong>of</strong> amedium, with a value <strong>of</strong> 7.0 indicating neutral, lower valuesindicating acidity, and higher values indicating increasedvalues <strong>of</strong> alkalinity.phacella n.pl.; sing. -um [Gr. phakellos, bundle] (CNID: Scyphozoa)Tentacle-like gastric filaments covered with gastrodermis,nematocysts and gland cells.phaeno- see phenophage n. [Gr. phagein, to eat] A bacterial virus.phagocytes n.pl. [Gr. phagein, to eat; kytos, container] Cells

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