Twelfth International Diatom Symposium

Volume 90 of the series Developments in Hydrobiology pp 31-38

Freshwater gomphonemoid diatom phylogeny: preliminary results

  • J. P. KociolekAffiliated withDiatom Collection Department of Invertebrate Zoology and Geology, California Academy of Sciences
  • , E. F. StoermerAffiliated withCenter for Great Lakes and Aquatic Sciences, The University of Michigan

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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