References

1. ^Martin Kostka; Ivan Cepicka; Vladimir Hampl &Jaroslav Flegr (2007)."Phylogenetic position of Karotomorpha and paraphyly of Proteromonadidae"(PDF).Molecular Phylogenetics and Evolution.43 (3):1167–1170.doi:10.1016/j.ympev.2006.11.002.PMID 17187998.
2. ^Nishi A, Ishida K, Endoh H (June 2005). "Reevaluation of the evolutionary position of opalinids based on 18S rDNA, and alpha- and beta-tubulin gene phylogenies".Journal of Molecular Evolution.60 (6):695–705.Bibcode:2005JMolE..60..695N.doi:10.1007/s00239-004-0149-x.PMID 15931497.