Gao S, Song W, Ma H; et al. (2008). "Phylogeny of six genera of the subclass Haptoria (Ciliophora, Litostomatea) inferred from sequences of the gene coding for small subunit ribosomal RNA". J. Eukaryot. Microbiol.55 (6): 562–6. PMID19120803. doi:10.1111/j.1550-7408.2008.00360.x.
Vd'ačný, Peter; et al. (May 2011). "Phylogeny and Classification of the Litostomatea (Protista, Ciliophora), with Emphasis on Free-Living Taxa and the 18S rRNA Gene". Mol Phylogenet Evol.59 (2): 510–22. PMID21333743. doi:10.1016/j.ympev.2011.02.016.
Gao S, Song W, Ma H; et al. (2008). "Phylogeny of six genera of the subclass Haptoria (Ciliophora, Litostomatea) inferred from sequences of the gene coding for small subunit ribosomal RNA". J. Eukaryot. Microbiol.55 (6): 562–6. PMID19120803. doi:10.1111/j.1550-7408.2008.00360.x.
Vd'ačný, Peter; et al. (May 2011). "Phylogeny and Classification of the Litostomatea (Protista, Ciliophora), with Emphasis on Free-Living Taxa and the 18S rRNA Gene". Mol Phylogenet Evol.59 (2): 510–22. PMID21333743. doi:10.1016/j.ympev.2011.02.016.