Morphological and molecular characterization of a new protist family, Sandmanniellidae n. fam. (Ciliophora, Colpodea), with description of Sandmanniella terricola n. g., n. sp. from the Chobe floodplain in Botswana.

Full Abstract

Sandmanniella terricola n. g., n. sp. was discovered in soil from the Chobe floodplain, Botswana, southern Africa. Its morphology and 18S rDNA gene sequence were studied with standard methods. Sandmanniella terricola is very likely an adversity strategist because it reaches peak abundances 6-12 h after rewetting the soil and maintains trophic food vacuoles with undigested bacteria in the resting cyst, a highly specific feature suggested as an indicator for an adversity life strategy. Possibly, the energy of the stored food vacuoles is used for reproduction and support of the cyst wall. Morphologically, Sandmanniella terricola is inconspicuous, having a size of only 50 x 40 microm and a simple, ellipsoidal shape. The main characteristics of the genus are a colpodid silverline pattern; a perioral cilia condensation; a flat, dish-shaped oral cavity, in the centre of which originates a long, conical oral basket resembling that of certain nassulid ciliates; and a vertically oriented left oral polykinetid composed of brick-shaped adoral organelles. This unique mixture of features and the gene sequence trees, where Sandmanniella shows an isolated position, suggest establishing a new family, the Sandmanniellidae n. fam., possibly related to the families Colpodidae or Bryophryidae. The curious oral basket provides some support for the hypothesis of a common ancestor of colpodid and nassulid ciliates.

Author information

Author/s: Foissner, Wilhelm (W); Stoeck, Thorsten (T);

Affiliation: Universität Salzburg, Austria. wilhelm.foissner(-atsign-)sbg.ac.at

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: The Journal of eukaryotic microbiology (J Eukaryot Microbiol), published in United States. (Language: eng)

Reference: -2009 Sep-Oct; vol 56 (issue 5) : pp 472-83

Dates: Created 2009/09/09; Completed 2009/11/02;

PMID: 19737201, status: MEDLINE (last retrieval date: 11/2/2009, IMS Date: )

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