Eocene to Holocene (Boudagher-Fadel, 2018). [details]
Confined to the upper Tf1 and Tf2 Letter Stages of the Middle Miocene of the Indo-Pacific (Boudagher-Fadel, 2018). [details]
emend. BouDagher-Fadel, 2002 [details]
Originally as a subgenus of Cycloclypeus. [details]