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. |