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Redescription of Dexiotricha colpidiopsis (Kahl, 1926) Jankowski, 1964 (Ciliophora, Oligohymenophorea) from a Hot Spring in Iceland with Identification Key for Dexiotricha species

Redescription of Dexiotricha colpidiopsis (Kahl, 1926) Jankowski, 1964 (Ciliophora, Oligohymenophorea) from a Hot Spring in Iceland with Identification Key for Dexiotricha species


Title: Redescription of Dexiotricha colpidiopsis (Kahl, 1926) Jankowski, 1964 (Ciliophora, Oligohymenophorea) from a Hot Spring in Iceland with Identification Key for Dexiotricha species
Author: Qu, Zhishuai
Groben, René
Marteinsson, Viggó   orcid.org/0000-0001-8340-821X
Agatha, Sabine
Filker, Sabine
Stoeck, Thorsten
Date: 2018
Language: English
Scope: 95-106
University/Institute: Háskóli Íslands
University of Iceland
School: Heilbrigðisvísindasvið (HÍ)
School of Health Sciences (UI)
Department: Matvæla- og næringarfræðideild (HÍ)
Faculty of Food Science and Nutrition (UI)
Series: Acta Protozoologica;57(2)
ISSN: 0065-1583
DOI: 10.4467/16890027AP.18.009.8983
Subject: Dexiotricha; Hot spring; Morphology; Phylogeny; SSU rRNA gene; Hverir; Frumdýr; Gen
URI: https://hdl.handle.net/20.500.11815/1090

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Citation:

Qu, Z., Groben, R., Marteinsson, V., Agatha, S., Filker, S., Stoeck, T. (1970). Redescription of Dexiotricha colpidiopsis (Kahl, 1926) Jankowski, 1964 (Ciliophora, Oligohymenophorea) from a Hot Spring in Iceland with Identification Key for Dexiotricha species. Acta Protozoologica, 2018, 95-106. doi:http://dx.doi.org/10.4467/16890027AP.18.009.8983

Abstract:

We isolated an encysted ciliate from a geothermal field in Iceland. The morphological features of this isolate fit the descriptions of Dexiotricha colpidiopsis (Kahl, 1926) Jankowski, 1964 very well. These comprise body shape and size in vivo, the number of somatic kineties, and the positions of macronucleus and contractile vacuole. Using state-of-the-art taxonomic methods, the species is redescribed, including phylogenetic analyses of the small subunit ribosomal RNA (SSU rRNA) gene as molecular marker. In the phylogenetic analyses, D. colpidiopsis clusters with the three available SSU rRNA gene sequences of congeners, suggesting a monophyly of the genus Dexiotricha. Its closest relative in phylogenetic analyses is D. elliptica, which also shows a high morphological similarity. This is the first record of a Dexiotricha species from a hot spring, indicating a wide temperature tolerance of this species at least in the encysted state. The new findings on D. colpidiopsis are included in a briefly revision of the scuticociliate genus Dexiotricha and an identification key to the species.

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