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An almost complete specimen of the irregular echinoid species Macropneustes mortoni was discovered in the Florala Limestone of the Lower Oligocene (Vicksburgian) of southern Alabama. Before this discovery, M. mortoni was reported only from the Upper Eocene of Alabama, Georgia and Florida. The find is significant because it proves that, contrary to what was previously thought, M. mortoni was one of the few Eocene echinoids to survive the extinctions of the Eocene-Oligocene in the Gulf Coastal Plain. It also corroborates the age assignment of the Florala Limestone to the Vicksburgian.