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1b. No subanal rostrum. Periproct marginal or inframarginal.
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2a. Anterior of test (towards top) extended out making the test vase-like. |
2b. Anterior of test (towards left) not extended. |
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3a. Anterior (to right) broadened and bilobed so that test outline is triangular. |
3b. Test cylindrical at anterior (to left). |
4a. Plating in posterior ambulacra continuous. |
4b. Posterior ambulacral plating disjunct; separated by plates of interambulacra 1 and 4 meeting along the midline. |