论文
论文标题: Systematic Studies on the Hypotrich Ciliate, Tachysoma pellionellum (Muller, 1773) Borror, 1972 (Protozoa, Ciliophora) Based on Integrative Analyses: Morphology, Morphogenesis and Molecular Phylogeny
作者: Chen, Lingyun; Zhao, Xiaolu; El-Serehy, Hamed A.; Huang, Jie; Clamp, John C.
出版刊物: ACTA PROTOZOOLOGICA
出版日期:
出版年份: 2017
卷/期: 4
DOI: 10.4467/16890027AP.17.020.7822
论文摘要: Tachysoma pellionellum Stokes, 1887, a freshwater ciliate isolated from Stone Mountain State Park, North Carolina, was studied in vivo and after staining with protargol. The population was characterized mainly by having the typical 18 frontal-ventral-transverse cirri; posterior ends of left and right marginal rows not confluent; five dorsal kineties and one dorsomarginal kinety; two macronuclear nodules near left cell margin with one or two micronuclei between them; contractile vacuole located at mid-body near left margin. Morphogenesis is characterized as follows: (1) in the proter, the parental adoral zone of membranelles is retained completely; (2) 18 frontal-ventral-transverse cirri are derived from the anlage of the undulating membrane and the five streaks of the frontal-ventral-transverse anlagen; (3) marginal rows develop intrakinetally; (4) anlagen of dorsal kineties 1, 2 and 4 develop in the parental structure and anlagen of dorsal kineties 2 and 4 fragment in the posterior region forming anlagen of dorsal kineties 3 and 5; (5) only one dorsomarginal kinety formed; (6) the two macronuclear nodules fuse into a single mass, which then divides. Phylogenetic analyses based on sequences of the gene coding for SSU RNA revealed a close relationship between T. pellionellum and the Oxytricha clade, both of which grouped with Kleinstyla dorsicirrata and Heterourosomoida lanceolata.
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