Fig. 6 in Multi-gene phylogeny of the subclass Astomatia (Protista: Ciliophora) refreshed with two rare astome ciliates from the digestive tube of endogeic earthworms

Fig. 6 Phylogenetic tree based on the 18S rRNA gene, showing the systematic positions of Metaradiophrya speculorum sp. n. and Maupasella mucronata isolated from endogeic lumbricid earthworms. The phylogenetic tree suggests that the evolution of endosymbiotic astome ciliates has proceeded through specialization to ecological groups of their host earthworms. Haptophrya planariarum and Dexiotricha spp. were used to a posteriori root the tree. Bootstrap