Saucède, T., Dudicourt, J.-C., & Courville, P. (2012). Description of two new fossil echinoids (Echinodermata: Echinoidea) from the Early Hauterivian (Early Cretaceous) of the Paris Basin (France). Zootaxa, 3512(1), 75–88. https://doi.org/10.11646/zootaxa.3512.1.5