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Thompson, J. R., Cotton, L. J., Candela, Y., Kutscher, M., Reich, M. and Bottjer, D. J. 2021. The Ordovician diversification of sea urchins: systematics of the Bothriocidaroida (Echinodermata: Echinoidea). Journal of Systematic Palaeontology. Vol. 19(20), pp. 1395-1448.