The Echinoid Directory

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Key to the genera of pedinopsid 1a. Ambulacra trigeminate. Go to 2 1b. Ambulacra quadrigeminate at ambitus and adapically. Go to 3 2a. Ambulacra with biserial pore-pairs adapically. Pedinopsis 2b. Ambulacral pore-pairs remain more or less uniserial adapically. Leptarbacia 3a. Ambulacral pore zones biserial throughout. Dumblea 3b. Ambulacral pore zones uniserially arranged. Cottaldia