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Schmidingerothrix salinarum nov. spec. is the molecular sister of the large oxytrichid clade (Ciliophora, Hypotricha)
Foissner, W.; Filker, S.; Stoeck, T. (2014). Schmidingerothrix salinarum nov. spec. is the molecular sister of the large oxytrichid clade (Ciliophora, Hypotricha). J. Eukaryot. Microbiol. 61(1): 61-74. https://dx.doi.org/10.1111/jeu.12087
In: Journal of Eukaryotic Microbiology. Society of Protozoologists: Lawrence, Kan . ISSN 1066-5234; e-ISSN 1550-7408, more
Peer reviewed article  
Available in  Authors 
Keywords
    Marine Sciences
    Marine Sciences > Marine Sciences General
    Scientific Community
    Scientific Publication
    Marine/Coastal
Author keywords
    Ancestral hypotricha; biodiversity; hypersaline habitats; Portugal;solar saltern
Project Top | Authors 
  • Association of European marine biological laboratories, more
Authors  Top 
  • Foissner, W.
  • Filker, S.
  • Stoeck, T.
Abstract
    In 2012, Foissner described a curious hypotrich: Schmidingerothrix extraordinaria. This ciliate, which he discovered in hypersaline soils (~100‰) from Namibia, had a frayed buccal lip, three-rowed adoral membranelles, only one frontal cirrus, and a miniaturized first frontal membranelle, while a paroral membrane, dorsal bristle rows and buccal, transverse and caudal cirri were absent. All opisthe structures developed de novo, while parental structures were involved in the proter. When Foissner's study became available, we discovered a similar species in a Portuguese solar saltern, differing from S. extraordinaria mainly by the number of frontoventral cirral rows (3 vs. 1). Furthermore, parental structures were involved in the ontogenesis of both proter and opisthe. The small subunit (SSU) rDNA shows Schmidingerothrix as sister of a large clade containing most classical oxytrichids (e.g. Sterkiella, Oxytricha, Steinia) and many related taxa (e.g. Pattersoniella, Bistichella, Uroleptus). This clade shows a bifurcation named “Oxytricha subclade” and “Uroleptus subclade”. Foissner (2012) interpreted the peculiarities of Schmidingerothrix as a reduction caused by the extreme habitat. However, the molecular data do not exclude that Schmidingerothrix presents an ancient state. A morphology-based scheme is presented, showing how the subclades might have evolved from a Schmidingerothrix-like ancestor.
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