The Echinoid Directory

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Key to the genera of Protoscutellidae

1a.Food grooves simple and unbranched; periproct marginal to oral, but always opening in plates posterior to first post-basicoronal pair. Protoscutella	1b.Food grooves bifurcating on second post-basicoronal plates; periproct oral, opening within first post-basicoronal plates. Go to 2
2a.Margin of test thin. Periarchus	2b.Margin of test thick and rounded. Mortonia