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Pinto, H.A., Wieloch, A.H. and Melo, A.L. de 2007. A new species of Trichodina Ehrenberg, 1838 (Ciliophora: Peritrichida) in Biomphalaria schrammi (Crosse, 1864) (Mollusca: Gastropoda). Lundiana: International Journal of Biodiversity. 7, 2 (Jun. 2007), 121–124. DOI:https://doi.org/10.35699/2675-5327.2006.23080.