Characterization of Euglenaformis gen. nov. and the chloroplast genome of Euglenaformis (Euglena) proxima (Euglenophyta)
Euglena proxima is a common, globally dispersed, and easily identified photosynthetic euglenoid. Previous phylogenetic analyses using nuclear-encoded small subunit (SSU) and large subunit (LSU) rRNA genes revealed that this taxon was paraphyletic with other Euglena species and was positioned as sister to all Euglenaceae. Despite this, authors were reluctant to remove this taxon from Euglena until additional data, or taxa pairing with E. proxima, were obtained because it created a monotypic genus. To clarify the taxonomy, the chloroplast genome of E. proxima was sequenced and compared with those of other photosynthetic euglenoids. Phylogenomic analyses were performed comparing 79 chloroplast-encoded genes from E. proxima with those found in seven photosynthetic euglenoids and three prasinophytes, the group from which the euglenoid chloroplast was probably derived. These analyses resulted in highly supported phylogenomic trees with topologies that were consistent with all previous phylogenetic analyses, i.e...