Andrade B.G., Costa P.M. Santos & Pimenta A. Dias (2011) Taxonomic review of the genus Opaliopsis (Gastropoda: Nystiellidae) from Brazil, with description of a new species. Journal of the Marine Biological Association of the United Kingdom 91(7): 1561-1566.
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Andrade, B. G.; Costa, P. M.; Santos & Pimenta, A.; Dias
2011
Taxonomic review of the genus Opaliopsis (Gastropoda: Nystiellidae) from Brazil, with description of a new species
Journal of the Marine Biological Association of the United Kingdom