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Phylogenetic Relationships within the Class Spirotrichea (Ciliophora) Inferred from Small Subunit rRNA Gene Sequences

✍ Scribed by Detlef Bernhard; Alexandra Stechmann; Wilhelm Foissner; Dieter Ammermann; Manuela Hehn; Martin Schlegel

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 118 KB
Volume: 21
Category: Article
ISSN: 1055-7903
DOI: 10.1006/mpev.2001.0997

No coin nor oath required. For personal study only.

✦ Synopsis

The small subunit rDNAs of five species belonging to the Euplotidae and eight species of the Oxytrichidae were sequenced to obtain a more detailed picture of the phylogenetic relationships within the Spirotrichea (Ciliophora). Various tree reconstruction algorhythms yielded nearly identical topologies. All Euplotidae were separated from the other Spirotrichea by a deep split. Further, a large genetic distance between the marine genus Moneuplotes and the freshwater species of Euplotoides was found. Differences between the methods used occurred only within the Oxytrichidae. Whereas the monophyly of the Stylonychinae was supported in all trees, the monophyly of the Oxytrichinae was not. However, the molecular data support the morphological and ontogenetic evidence that the pattern of 18 frontal-ventral-transversal cirri evolved in the stemline of the Oxytrichidae and was modified several times independently. Our results are also in agreement with taxonomic revisions: the separation of both Sterkiella nova from Oxytricha and Tetmemena pustulata from Stylonychia.

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