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2 Excavata: Acrasiomycota; Amoebozoa: Dictyosteliomycota, Myxomycota

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Systematics and Evolution

Part of the book series: The Mycota ((MYCOTA,volume 7A))

Abstract

The organisms commonly referred to as slime molds belong to three different taxonomic groups, the two largest of which (the dictyostelids and myxomycetes) are closely related members of the supergroup Amoebozoa. Members of the third, and much smaller, group (traditionally known as acrasids but more appropriately referred to as sorocarpic amoebae) belong to the supergroup Excavata. Both dictyostelids and myxomycetes are common to abundant organisms in terrestrial ecosystems. Dictyostelids are most commonly associated with the microhabitat represented by the surface humus layers of soil, whereas the ecological distribution of myxomycetes encompasses a wide range of microhabitats. Myxomycetes, with about 900 described species, are the better known group, and they are more easily collected and studied. Dictyostelids, with approximately 150 species, more than half of which have been described rather recently, are isolated in laboratory culture from samples collected in the field. Only recently have the techniques of modern molecular biology been applied to the study of these two groups in an effort to develop a more complete understanding of their biology, ecology, and phylogeny. Because they have been so poorly studied, little is known about the global distribution and ecology of the acrasids.

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Acknowledgments

Appreciation is extended to Drs. Matt Brown, James Cavender, Jim Clark, Alan Feest, Anna Maria Fiore-Donno, Ed Haskins, John Landolt, and Maria Romeralo for reviewing portions of this chapter.

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  1. Department of Biological Sciences, University of Arkansas, Fayetteville, AR, 72701, USA

    Steven L. Stephenson

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  1. Dept. Plant Biology, University of Minesota, St. Paul, Minnesota, USA

    David J. McLaughlin

  2. Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon, USA

    Joseph W. Spatafora

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Stephenson, S.L. (2014). 2 Excavata: Acrasiomycota; Amoebozoa: Dictyosteliomycota, Myxomycota. In: McLaughlin, D., Spatafora, J. (eds) Systematics and Evolution. The Mycota, vol 7A. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-55318-9_2

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