Reference

A.-D.G. Wright, Denis Lynn (1997): Monophyly of the trichostome ciliates (Phylum Ciliophora: class Litostomatea) tested using new 18S rRNA sequences from the vestibuliferids, Isotricha intestinalis and Dasytricha ruminantium, and the haptorian, Didinium nasutum – Europ. J. Protistol. – 33: 305 - 315.