(2010). The lineage resolved as sister to Scenedesmaceae, Neochloridaceae, and Hydrodictyaceae comprises two desert soil crust isolates, for which we propose a new genus name, Rotundella. Only UTEX B2979 remains alive to date, and for this strain, we propose a new species name R. rotunda. We also erect a new monotypic family, Rotundellaceae, to accommodate this lineage that currently only comprises coccoid soil inhabitants with rarely occurring asexual flagellated stages. Pseudomuriella also does not appear associated with any recognized family in Sphaeropleales. The genus currently comprises four cryptic species, and the
genetic diversity within this genus was described in Fučíková et al. (2011b). We erect the family Pseudomuriellaceae to harbor this lineage. Pseudomuriella is a multinucleate, Tanespimycin chemical structure polyplastidic alga that lacks pyrenoids and may easily be confused with Bracteacoccus. While zoospores have been reported in Pseudomuriella (Kalina and Punčochářová 1987), they have not been examined in detail using EM. The fusiform aquatic genus Schroederia, represented in this study by the type species S. setigera (Schröder) Lemmermann, is currently classified as a member http://www.selleckchem.com/p38-MAPK.html of Characiaceae. However, this family is now known to be polyphyletic, containing members of Sphaeropleaceae (Ankyra)
as well as Neochloridaceae (Characiopodium), and volvocalean algae such as Characium and Chlamydopodium (reviewed in Lewis and McCourt 2004). Our results suggest that Schroederia should be placed in a separate family, for which we propose the name Schroederiaceae. This family likely also includes the genus Pseudoschroederia (relationship with Schroederia shown in Shoup and Lewis MCE公司 2003). The ultrastructure and reproduction of Schroederia and Pseudoschroederia were examined by Hegewald and Schnepf (1986), who described the algae as uninucleate, monoplastidic, and reproducing asexually via autospores or biflagellate zoospores. Pyrenoids in this family are enclosed in starch sheaths and are not invaginated
by thylakoids. A morphology-based revision of the Radiococcaceae was published by Kostikov et al. (2002), and included a number of genera. Of these, our study only included representatives of Radiococcus and Planktosphaeria. Figure 2 shows that the sister group to Radiococcus is the genus Follicularia, which we herein include in Radiococcaceae. Kostikov et al. (2002) also included Schizochlamydella in this family, but it was since shown to be closely related to the trebouxiophyte Oocystis (Wolf et al. 2003). Planktosphaeria grouped strongly with Schizochlamys, but because a considerable phylogenetic distance separates Radiococcaceae and these two genera and because their sister relationship was only weakly supported, we propose a new family name, Schizochlamydaceae, for the clade containing Planktosphaeria and Schizochlamys.