Nomenclatural changes in heterocytous Cyanoprokaryotes (Cyanobacteria, Cyanophytes).

Abstract

The criteria for systematic classification of Cyanoprokaryota (Cyanobacteria, Cyanophyta) were changed considerably in last decades. The molecular and morphological analyses, ecological characterization and biochemical markers are indispensable premises for modern cyanobacterial taxonomic re-classification. Many genera were divided, newly described and numerous species were transferred in generic entities, characterized on the basis of molecular, ecological and revised morphological criteria. All of the proposed taxonomic changes are included in the manuscript of the recently prepared 3rd volume of "Cyanoprokaryotes" in the frame of the new edited compendium SĂźsswasserflora von Mitteleuropa" (2nd edition, volume 19/3, Heterocytous genera). The used taxonomic status of many taxa is already clearly revised in numerous modern publications, but in several cases the nomenclatural consequences were not yet validly published (new combinations, few new names of taxa). However, it is necessary to publish validly the corrected names before edition of any monographic review. The valid nomenclatural transfer of 9 species, one new name and description of two species, the changed position of which follows without doubts from the recent modern revisions, are therefore included in the present article. The validation is published in agreement with the last edition of Botanical Nomenclatoric Code (ICBN; McNeill et al., ed. 2007). All the mentioned species belong to the heterocytous monophyletic group Nostocales (or Nostochineae, respectively), and are arranged alphabetically.