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Volkmer-Ribeiro, C.; De Drago, I.E.; Souza Machado, V.D.; Sabaj, M.H. (2017). Drulia cristinae, new species of sponge from the rio Xingu, Amazonas Basin, Brazil (Porifera: Demospongiae: Poecilosclerida: Metaniidae Volkmer-Ribeiro, 1986). Proceedings of the Academy of Natural Sciences of Philadelphia. 166(1): 1-17.