Jordan, R.W. & Ito, R. (2002). Observations on Proboscia species from late Cretaceous sediments, and their possible evolution from Kreagra. In: J. John (ed.), Proceedings of the 15th International Diatom Symposium, Perth, Australia, 28 September -2 October, 1998, A.R.G. Gantner Verlag K.G., pp. 313-330