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Pyenson, N. D., Vélez-Juarbe, J., Gutstein, C. S., Little, H., Vigil, D. and O’Dea, A. 2015. Isthminia panamensis, a new fossil inioid (Mammalia, Cetacea) from the Chagres Formation of Panama and the evolution of ‘river dolphins’ in the Americas. PeerJ. Vol. 3, p. e1227.