(Scale bar is 1 cm)
Previously assigned to the genus Cassidulus, this is a very common echinoid from the Oligocene of the southeastern United States. Known from North Carolina, Florida, Mississippi, and everywhere between, it is one of the two most geographically widespread echinoid species in the region.
The species is known only from lower Oligocene (Vicksburgian or Rupelian) rocks, including the Suwannee Limestone, Bridgeboro Limestone, and the undifferentiated Oligocene residuum of the Dougherty Plain.
The morphology of the test suggests that it could probably only burrow to shallow depths in coarse sediment, and it is only found with such sediment throughout its geographic range.
AGE: EARLY OLIGOCENE
FORMATION: BRIDGEBORO and SUWANNEE LIMESTONES
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