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Martins, A.M.D.F., Brito, C.P. and Backeljau, T. 2013. Oxychilus (Drouetia) viridescens (Gastropoda: Pulmonata: Oxychilidae), a new species from Santa Maria, Açores, and a review of the subgenus. Zootaxa. 3619, 3 (Feb. 2013), 343–368. DOI:https://doi.org/10.11646/zootaxa.3619.3.5.