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Clypeasteroids with:
Early Eocene to Recent; worldwide.
For detailed discussion of this grouping see Nisiyama (1968). Nisiyama, S. 1968. The echinoid fauna from Japan and adjacent regions, Part II. Palaeontological Society of Japan, Special Paper 13, 1-491, pls 19-30.
For detailed discussion of this grouping see Nisiyama (1968).
Nisiyama, S. 1968. The echinoid fauna from Japan and adjacent regions, Part II. Palaeontological Society of Japan, Special Paper 13, 1-491, pls 19-30.