Freshwater gomphonemoid diatom phylogeny: preliminary results

  • J. P. Kociolek
  • E. F. Stoermer
Conference paper

DOI: 10.1007/978-94-017-3622-0_4

Part of the Developments in Hydrobiology book series (DIHY, volume 90)
Cite this paper as:
Kociolek J.P., Stoermer E.F. (1993) Freshwater gomphonemoid diatom phylogeny: preliminary results. In: van Dam H. (eds) Twelfth International Diatom Symposium. Developments in Hydrobiology, vol 90. Springer, Dordrecht

Abstract

A cladistic analysis of eleven freshwater gomphonemoid diatom taxa yielded three equally most parsimonious cladograms. The three cladograms suggest Gomphoneis Cleve is non-monophyletic as originally and recently circumscribed. Gomphoneis elegans and G. transsilvanica (Pant.) Krammer are more closely related to Gomphopleura Reichelt ex Tempère than to other members of the genus. Gomphoneis geitleri Kociolek and Stoermer appears to represent a monotypic lineage. Among the taxa with differentiated apical pore fields Gomphonema kaznakowi Mereschkowsky appears to be primitively astigmate.

The three cladograms vary with regard to systematic affinities among the Gomphoneis herculeana (Ehrenberg) Cleve group, Miocene gomphonemoid species from Idaho (USA), gomphonemoid taxa from East Africa and Gomphonema sensu stricto. Despite variability in number of puncta rows per stria and presence of an axial plate in the Miocene species from North America, inclusion of these taxa in the analysis provided better resolution of relationships than if they were excluded.

Key words

cladistics Gomphoneis Gomphonema Gomphopleura phylogeny 

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Copyright information

© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  • J. P. Kociolek
    • 1
  • E. F. Stoermer
    • 2
  1. 1.Diatom Collection Department of Invertebrate Zoology and GeologyCalifornia Academy of SciencesSan FranciscoUSA
  2. 2.Center for Great Lakes and Aquatic SciencesThe University of MichiganAnn ArborUSA

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