Utz, L.R.P., Santos, M.S.D. and Araujo, G.O.D. 2015. Epistylis smalli (Ciliophora: Peritrichia) a new peritrich from Guaiba Lake, Southern Brazil. Zootaxa. 4040, 4 (Nov. 2015), 483–488. DOI:https://doi.org/10.11646/zootaxa.4040.4.10.