The Echinoid Directory

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Key to the genera of Clypeidae

1a. Test subquadrate, obviously longer than wide. Cluniculus	1b. Test subcircular. Go to 2
2a. Pore-pairs in phyllode arranged in oblique rows of three towards peristome. Ambitus sharp and low. Clypeus	2b. Pore-pairs in outer series forming a more or less straight line. Ambitus rounded. Pseudosorella