The rudist bivalve Durania aguilae Adkins was described from the Mendez Formation in Mexico and originally attributed to the Santonian. We revise this species and show that it belongs to the genus Chiapasella Müllerried. We also recognize that Chiapasella aguilae (Adkins) is a senior synonym of Chiapasella trechmanni Mitchell and Gunter, an important biostratigraphic indicator in the late late Maastrichtian of Jamaica. Chiapasella aguilae is therefore an important late late Maastrichtian marker fossil that has been recorded from Jamaica, Mexico, and Cuba.

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