| phylogenetic position of species in the genera anoplophrya, plagiotoma, and nyctotheroides (phylum ciliophora), endosymbiotic ciliates of annelids and anurans. | we have used small subunit rrna gene sequences to determine the phylogenetic relationships of species in three genera of endosymbiotic ciliates. we have confirmed that the astome anoplophrya marylandensis is related to ciliates in the class oligohymenophorea, supporting the view that astomes are derived from hymenostome-like ancestors. we confirmed that plaglotoma lumbrici, formerly considered to be a heterotrich, is a stichotrich spirotrich ciliate most closely related to paraurostyla weissei i ... | 2004 | 15218698 |