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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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694Maggenti and Gardnerplanula n.; pl. -lae [L. planus, flat] (CNID) A free-swimmingciliated larva, cylindrical to ovoid with two cell layers (ectodermand endoderm).plaques n. [F. plaque, plate] 1. (NEMATA) Cuticular "warts". 2.(POGON) Small scales <strong>of</strong> cuticle on the trunk papillae.plasma n. [Gr. plasma, formed or molded] The fluid portion <strong>of</strong>blood or lymph.plasmagene n. [Gr. plasma, formed or molded; gennaein, toproduce] A genetic factor located in the cytoplasm, ratherthan in the nucleus; a plasmid; a plane.plasmalemma see plasma membraneplasma membrane A unit membrane surrounding the cell'sprotoplasm; cell membrane; plasmalemma.plasmatocytes n.pl. [Gr. plasma, formed or molded; kytos,container] Small to large polymorphic hemocytes with around to elongate nucleus and with either homogeneous orfinely granular or finely vacuolated cytoplasm.plasmid n. [Gr. plasma, formed or molded; eidos, like] DNAmolecules that are not attached to a chromosome but areinherited regularly.plasmon n. [Gr. plasma, formed or molded] All extrachromosomalhereditary determinents; plasmotype.plasmosome see nucleolusplasmotype see plasmonplastic a. [Gr. plasma, a thing molded] Formative.plastids n.pl. [Gr. plastos, formed; dim. -idion] A generalizedterm for cell organelles.plastosomes see mitochondriaplastron n. [F. plastron, breast plate] 1. The chorion <strong>of</strong> someeggs. 2. (ARTHRO: Insecta) A permanent film <strong>of</strong> air retainedby hairs on the outside <strong>of</strong> an aquatic insect body allowingan air water interface for gaseous exchange. 3. ECHINOD:Echinoidea) In Spatangoida, a ventral interambulacral areabetween the labrum and periproct, sometimes with specialspination.plate organ see sensillum placodeum

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