Wilts, E.F., Bininda-Emonds, O.R.P. and Ahlrichs, W.H. 2009. Comparison of the predatory rotifers Pleurotrocha petromyzon (Ehrenberg, 1830) and Pleurotrocha sigmoidea Skorikov, 1896 (Rotifera: Monogononta: Notommatidae) based on light and electron microscopic observations. Zootaxa. 2130, 1 (Jun. 2009), 1–20. DOI:https://doi.org/10.11646/zootaxa.2130.1.1.