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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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<strong>Online</strong> <strong>Dictionary</strong> <strong>of</strong> <strong>Invertebrate</strong> <strong>Zoology</strong> 835somatic crossing-over Reciprocal chromatin exchange betweenhomologous chromosomes during somatic mitosis.somatic hybrid Non-sexual or vegetative hybrid.somatic layer The external layer <strong>of</strong> the mesoderm.somatic musculature 1. Muscles <strong>of</strong> the body. 2. (NEMATA)Longitudinally oriented muscle cells, usually spindleshaped,containing a noncontractile portion and a contractileportion that control body movement.somatic mutation Mutation in any cell other than a germ cellor its precursor.somatic setae 1. Any setae on the body. 2. (ANN) Setae <strong>of</strong> thesomatic segments that function in locomotion.somatoblast n. [Gr. soma, body; blastos, bud] A cell thatgives rise to somatic cells.somatocoel n. [Gr. soma, body; koilos, hollow] (ECHINOD) Theposterior <strong>of</strong> the three regions <strong>of</strong> coelomic sacs <strong>of</strong> the embryoniccoelom, anterior (axocoel), and middle (hydrocoel).somatocyst n. [Gr. soma, body; kystis, bladder] (CNID: Hydrozoa)In Siphonophora, the beginning <strong>of</strong> the stem gastrovascularcanal that may contain an oil droplet.somatoderm n. [Gr. soma, body; derma, skin] (MESO) Theouter rings <strong>of</strong> cells around the body; jacket cells.somato-esophageal muscles Muscles common to the esophagealregion.somato-intestinal muscles Muscles found in the region <strong>of</strong> theintestine, extending from the body wall.somatome n. [Gr. soma, body; tome, cutting] A somite.somatoplasm n. [Gr. soma, body; plasma, formed or molded]The body-tissues.somatopleure n. [Gr. soma, body; pleura, side] The somaticlayer.somatotheca n. [Gr. soma, body; theke, case] (ARTHRO: Insecta)Area <strong>of</strong> pupa covering the abdominal rings. seegasterotheca.somite n. [Gr. soma, body] A division <strong>of</strong> the body; a bodysegment <strong>of</strong> a metamerically segmented animal; a soma-

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