Kier, P. M. 1972. Tertiary and Mesozoic Echinoids of Saudi Arabia. Smithsonian Contributions to Paleobiology 10, 1-105., available online athttps://doi.org/10.5479/si.00810266.10.1 page(s): 61-62; fig. 28, pl. 33: figs 1-6 [details]
original descriptionKier, P. M. 1972. Tertiary and Mesozoic Echinoids of Saudi Arabia. Smithsonian Contributions to Paleobiology 10, 1-105., available online athttps://doi.org/10.5479/si.00810266.10.1 page(s): 61-62; fig. 28, pl. 33: figs 1-6 [details]