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Key to the genera of Cyclasterinae

1a. Anterior ambulacrum with small non- petaloid pore-pairs. Cyclaster	1b. Anterior ambulacrum with elongate pore-pairs similar to those in the paired ambulacra. Go to 2
2a. Petals short, not extending to ambitus. Isaster	2b. Petals long and parallel, extending to the ambitus. Isopatagus