Detailed information for reference 33619Squires, R.L. and R.A. Dimetrion (1994) A new species of the oligopygoid echinoid Haimea from the lower Eocene of Baja California Sur, Mexico. Journal of Paleontology 68(4): 846-851, figs. 1-9. PDF is 18MB (also available in 3 parts)
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