A contribution to the phylogeny of agglutinating Arcellinida (Amoebozoa) based on SSU rRNA gene sequences

作者：Gomaa Fatma^*; Lahr Daniel J G; Todorov Milcho; Li Jingchun; Lara Enrique

来源：European Journal of Protistology, 2017, 59: 99-107.

DOI：10.1016/j.ejop.2017.03.005

• Agglutinated shell
• Classification
• Difflugia
• Morphology
• Sphaerothecina
• SSU rRNA gene sequences

Arcellinid testate amoebae include a wide variety of amoeboid organisms whose test (shell) varies in shape, composition and size. A decade ago, we initiated molecular phylogenetic analyses based on SSU rRNA gene sequences and a taxonomic revision of Arcellinida. However, many lineages within Arcellinida still lack molecular data, and the phylogeny of this group is largely incomplete. In this study, we obtained SSU rRNA gene sequences from seven taxa, of which six have agglutinated shell (Diifiugia oblonga, D. labiosa, D. gramen, Mediolus corona, Netzelia wailesi, and N. tuberculata), and one has an entirely proteinaceous shell (Arcella intermedia). All species but DOugia oblonga branched within the recently erected suborder Sphaerothecina, confirming the synapomorphic value of an oviform or discoid shell. Thus, we propose that species with an oviform or discoid shell currently classified within genus DOugia must be transferred to other genera, thus continuing the process of taxonomic revision of genus Difflugia, the largest Arcellinida genus. We therefore transferred the current and the previously sequenced oviform Diifiugia spp. to Netzelia spp., based on the shared globular/oviform shell shape and their monophyly. Another species, D. labiosa, formed an independent lineage that branched as a sister Glade to Arcella spp.; based on the shell morphology and their phylogenetic position, we considered D. labiosa as incertae sedis.

• 出版日期2017-6