The Echinoid Directory

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Key to the genera of Paleopneustidae

1a. Petals wide with broad perradial interporal zone. Antillaster	1b. Petals narrow with interporal zone not much wider than pore zone. Go to 2
2a. Periproct inframarginal; clearly visible in oral view. Plesiozonus	2b. Periproct marginal; largely hidden in oral view. Go to 3
3a. Anterior of test convex; no sulcus. Paleopneustes	3b. Anterior of test indented by sulcus. Mortonaster