Acta Protozoologica

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Some Ultrastructural Features of the Planktonic Freshwater Ciliate Limnostrombidium viride (Alveolata, Ciliophora, Oligotrichida) and Improved Diagnoses of Oligotrich Taxa

Publication date: 11.01.2019

Acta Protozoologica, 2018, Volume 57, Issue 3, pp. 169 - 193



Christian F. Bardele
Department of Evolution and Ecology, University of Tübingen, Tübingen, Germany
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Nicole Stockmann
Department of Evolution and Ecology, University of Tübingen, Tübingen, Germany
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Sabine Agatha
Department of Biosciences, University of Salzburg, Salzburg, Austria
Department of Organismic Biology, University of Salzburg, Salzburg, Austria
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The first transmission and scanning electron microscopical studies in combination with freeze-fracture technology have disclosed some important morphological and ultrastructural features in the freshwater oligotrichid Limnostrombidium viride. (I) The dikinetids (paired basal bodies) of the girdle kinety have a club-shaped cilium associated only with each left basal body. The electron-dense (paraflagellar) body on one side of its “92+2”-axoneme and the regular array of intramembranous particles indicate a sensory, perhaps photoreceptor function of these club-shaped cilia. (II) The stichomonad endoral membrane is proximally covered by a cytoplasmic fold and distally by multiple membranous layers. Thus entirely covered, the endoral is probably no longer involved in food capture; none the less, its associated microtubules might stabilise the cytopharynx. (III) Instead of a contractile vacuole, a horizontal ring-canal with supposed osmoregulatory function occurs. (IV) The extrusive nature of the trichites is not only observed in  electron micrographs, but the attachment sites of these organelles also display a rosette of “8+1”-particles in the P-face of freeze-fracture replicas typical for ciliate extrusomes. (V) The neoformation organelle, the subsurface tube in which stomatogenesis takes place, shows short basal bodies and normal axonemes about 1 μm long. It is accompanied by numerous membrane vesicles, which might provide membrane material for the outgrowing cilia.


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Information: Acta Protozoologica, 2018, pp. 169 - 193

Article type: Original research article


Department of Evolution and Ecology, University of Tübingen, Tübingen, Germany

Department of Evolution and Ecology, University of Tübingen, Tübingen, Germany

Department of Biosciences, University of Salzburg, Salzburg, Austria

Department of Organismic Biology, University of Salzburg, Salzburg, Austria

Published at: 11.01.2019

Article status: Open

Licence: CC BY-NC-ND  licence icon

Percentage share of authors:

Christian F. Bardele (Author) - 33%
Nicole Stockmann (Author) - 33%
Sabine Agatha (Author) - 34%

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