Nocturama gen. nov., nothocladus s. lat. and other taxonomic novelties resulting from the further resolution of paraphyly in Australasian members of Batrachospermum(Batrachospermales, Rhodophyta)
2016
The informal "Australasica Group" was established in 2009 to include several Australasian endemic Batrachospermum species, a few species of the
cosmopolitanBatrachospermum section Setacea, and the South American endemic Petrohua bernabei. Although useful for communication purposes, no formal taxonomic designation was proposed due to weakly supported basal nodes. The present research took a two-pronged approach of adding more taxa (29 additional specimens) as well as more sequence data (LSU, cox1, psaA, and psbA markers added to rbcL data) to provide better resolution. The resulting tree showed improved statistical support values (Bayesian
posterior probabilityand maximum likelihood bootstrap) for most nodes providing a framework for taxonomic revision. Based on our well-resolved phylogeny, a new genus, Nocturama, is proposed for a clade of Batrachospermum antipodites specimens. The
circumscriptionof Nothocladus is expanded to include Batrachospermum section Setacea and four additional sections composed of at least 10 species, mostly from Australia and New Zealand. One new species added to the data set, N. diatyches, did not form a clade with the other species of section Setaceus, where it was classified previously, rendering that section paraphyletic. To resolve this, N. diatyches and the morphologically similar species N. latericius are included with N. theaquus, in the new section Theaquus within Nothocladus s. lat. A specimen from Australia unaligned to these clades was sister to the Australia-New Zealand genus Psilosiphon and the
cosmopolitanB. cayennense, but lacked statistical support. This specimen has the
gross morphologyof Batrachospermum s. lat. and is here provisionally assigned to that genus, as B. serendipidum sp. nov.
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