Descrição original: Maury, C. J. (1917). Santo Domingo type sections and fossils, Part 1. Bulletins of American Paleontology. 5(29): 1(165)-251(415), pls 1(27)-39(65)., available online at https://www.biodiversitylibrary.org/page/32510772page(s): 225-226, pl. 9, fig. 17