Simnia is a genus of sea snails, marine gastropod molluscs in the family Ovulidae.

Accordingly, all the species treated in Lorenz & Fehse (2009) under Neosimnia should thereby be accepted under Simnia.

Likewise, all the species treated by Lorenz & Fehse (2009) under Simnia should thereby be accepted under Xandarovula Cate, 1973.

The valid assignment of the taxa are found in Lorenz & Fehse, 2009.

The assumption of Dolin prepared the following chaos: Species within the genus Simnia include: