Bithynia | Prusias I of Bithynia | Nicomedes IV of Bithynia | Bithynia troschelii | Prusias II of Bithynia | Auxentius of Bithynia | Asclepiades of Bithynia |
Bithynia siamensis and Bithynia funiculata (synonym: Bithynia goniomphala) were recognized as separate species in the 2012 IUCN Red List.