The Echinoid Directory

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Key to the genera of Stomopneustidae 1a. Ambulacral pore zones forming a single adradial band. Phymotaxis 1b. Ambulacral pore-pairs offset to form wide zones above the ambitus. Go to 2 2a. Ambulacral pore-pairs forming a single adradial band. Phymechinus 2b. Ambulacral pore-pairs forming three discrete columns. Go to 3 3a. Ambulacral tubercles biserial. Stomopneustes 3b. Ambulacral tubercles uniserial. Triadechinus