@ARTICLE{TreeBASE2Ref19113, author = {Karolina Fucikova and Jared C. Rada and Louise A. Lewis}, title = {The tangled taxonomic history of Dictyococcus, Bracteacoccus, and Pseudomuriella (Chlorophyceae, Chlorophyta) and their distinction based on a phylogenetic perspective. }, year = {2011}, keywords = {coccoid, inflection, chloroplast}, doi = {}, url = {http://}, pmid = {}, journal = {Phycologia}, volume = {50}, number = {4}, pages = {}, abstract = {In coccoid green algae, sole use of the limited morphology for taxonomy and systematics can lead to taxonomic and systematic confusion. Using other forms of data, several green coccoid genera have been shown to be non-monophyletic in the past. Using phylogenetic analysis of rbcL and 18S rDNA sequence data, this study clarifies the relationship of coccoid genera Bracteacoccus, Dictyococcus and Pseudomuriella. We show that Bracteacoccus engadinensis (Kol & F. Chodat) Starr is closely related to the alga Pseudomuriella aurantiaca Hanagata (Vischer), rather than to the rest of examined Bracteacoccus species. Similarly, Dictyococcus schumacherensis Metting is related to P. aurantiaca, rather than to the type species of Dictyococcus, D. varians. In both cases, this placement is consistent with the species? ecology and vegetative morphology. Consequently, we propose Pseudomuriella schumacherensis (based on Dictyococcus schumacherensis) and P. engadinensis (based on Bracteacoccus engadinensis), and emend the species description of the former with an altered interpretation of chloroplast features. The genus Dictyococcus, based on its type species, D. varians Gerneck, remains a distinct taxon, but its placement in Chlorophyceae remains poorly resolved by 18S and rbcL data. The previously expected sister relationship of Dictyococcus with Bracteacoccus is not supported by this study. We examined morphological features of the three genera, Dictyococcus, Bracteacoccus, and Pseudomuriella in order to identify characters for their distinction on the level of light microscopy. The generic diagnosis of Pseudomuriella is emended to accommodate our findings.} }

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