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The “Tetrahymena pyriformis” complex of cryptic species

  • Chapter
Protist Diversity and Geographical Distribution

Part of the book series: Topics in Biodiversity and Conservation ((TOBC,volume 8))

Abstract

Cryptic species are common among protists and have long been known in ciliates. The ciliate genus Tetrahymena contains a large group of morphologically indistinguishable species referred to as the ‘T. pyriformis’ complex. These species include those reproductively isolated by mating type as well as asexual species characterized by the absence of the germinal micronucleus. This paper examines the molecular diversity of the species and describes the biogeography of ‘T. pyriformis’ species. Most species are globally distributed, though the best studied species, T. thermophila, is confined to North America and gives evidence of population structure in local populations. Selfers and asexual species are common and arise from sexual species, a possible exploitation of nuclear dimorphism. It is argued that the cryptic species likely have different ecological roles and that the biodiversity of Tetrahymena in particular, and ciliates in general, is underestimated.

Special Issue: Protist diversity and geographic distribution. Guest editor: W. Foissner.

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Abbreviations

COX1:

Cytochrome oxidase 1 subunit

CT:

Connecticut

D2:

A hypervariable region of LSU

FL:

Florida

IL:

Illinois

LSU:

Large ribosomal subunit

MA:

Massachusetts

ME:

Maine

MI:

Michigan

PA:

Pennsylvania

NH:

New Hampshire

NW PA:

North West Pennsylvania

RRNA:

Ribosomal RNA

VT:

Vermont

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Authors and Affiliations

  1. Department of Animal Biology, University of Illinois at Urbana-Champaign, 505 South Goodwin Avenue, 61801, Urbana, IL, USA

    Ellen M. Simon & David L. Nanney

  2. Department of Biological, Geological and Environmental Sciences, Cleveland State University, 2121 Euclid Avenue, 44115, Cleveland, OH, USA

    F. Paul Doerder

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  1. Ellen M. Simon
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  2. David L. Nanney
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  3. F. Paul Doerder
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Correspondence to F. Paul Doerder .

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Editors and Affiliations

  1. Inst. Zoologie, Universität Salzburg, Naturwissenschaftliche Fakultät, Hellbrunnerstr. 34, 5020, Salzburg, Austria

    W. Foissner

  2. Dept. Biologia Vegetal II, Universidad Complutense, Fac. Farmacia, Plaza de Ramony Cajal, 28040, Ciudad Universitaria, Madrid, Spain

    David L. Hawksworth

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Simon, E.M., Nanney, D.L., Doerder, F.P. (2007). The “Tetrahymena pyriformis” complex of cryptic species. In: Foissner, W., Hawksworth, D.L. (eds) Protist Diversity and Geographical Distribution. Topics in Biodiversity and Conservation, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2801-3_10

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