%0 Journal Article
%T The Systematic Studies on the Hypotrich Ciliate, Tachysoma pellionellum (Müller, 1773) Borror, 1972 (Protozoa, Ciliophora) Based on Integrative Approaches: Morphology, Morphogenesis and Molecular Phylogenetic Analyses
%A Chen, Lingyun
%A Zhao, Xiaolu
%A El-Serehy, Hamed A.
%A Huang, Jie
%A Clamp, John C.
%J Acta Protozoologica
%V 2017
%R 10.4467/16890027AP.17.020.7822
%N Volume 56, Issue 4
%P 221-233
%K fresh water ciliate, ontogenesis, phylogenetic analysis, taxonomy
%@ 0065-1583
%D 2017
%U https://ejournals.eu/en/journal/acta-protozoologica/article/the-systematic-studies-on-the-hypotrich-ciliate-tachysoma-pellionellum-muller-1773-borror-1972-protozoa-ciliophora-based-on-integrative-approaches-morphology-morphogenesis-and-molecular-phylogenetic-analyses
%X 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.