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Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

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PP 1 In Mendel's laws, the first parental generation; parents <strong>of</strong> agiven individual <strong>of</strong> the F 1 generation.pachynema n. [Gr. pachys, thick; nema, thread] Thickened,paired chromosomes <strong>of</strong> meiosis prophase I, third stage;sometimes used as a synonym <strong>of</strong> pachytene.pachyodont a. [Gr. pachys, thick; odous, tooth] (MOLL: Bivalvia)With heavy, blunt, amorphous teeth.pachytene n. [Gr. pachys, thick; tainia, ribbon] A prophase Istage in meiosis in which the chromosomes are thickenedand paired and crossing over occurs. see pachynema.pad n. [origin uncertain] (MOLL: Bivalvia) In oysters, a thinaragonite layer on which the adductor muscle is inserted.paedogenesis n. [Gr. pais, child; gennaein, to produce] 1.(ARTHRO: Insecta) Parthenogenetic reproduction by insectlarvae structurally unable to copulate. 2. Progenesis. seeneoteny.paedomorphosis n. [Gr. pais, child; morphosis, shaping]Evolutionary change in which ancestrally immature structuresare retained.paedoparthenogenesis see paedogenesispagina n. [L. pagina, leaf] (ARTHRO: Insecta) The surface <strong>of</strong> awing; inferior= lower surface; superior= upper surface.pagiopodous a. [Gr. pagios, solid; pous, foot] (ARTHRO: Insecta)In aquatic Hemiptera, refers to the posterior coxaehaving the articulation in the form <strong>of</strong> a hinge joint. see trochalopodous.paired see didymouspairing a. [L. par, equal] Chromosome pairing, highly specificassociation (side by side) <strong>of</strong> homologous chromosomes.pala n.; pl. palae [L. pala, shovel] (ARTHRO: Insecta) In corixidHemiptera, the tarsus modified as a hair-fringed scoop forparticle feeding.

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