Xenocyprididae
This taxon, sometimes spelt Xenocypridae, was previoulsy regarded to be a subfamily, Xenocyprinae,[2] of the family Cyprinidae.Cyprinidae sensu lato is now divided into a number of smaller families within the suborder Cyprinoidei, in the order Cypriniformes.[3] Xenocyprididae contains the following valid genera:[1] A potential fossil genus of the Xenocyprinae is Planktophaga from the middle-late Eocene of Vietnam.Although initially classified under the East Asian group of Leuciscinae sensu lato (as Hypophthalmichthys was previously classified under it), it has unique pharyngeal teeth only shared with Hypophthalmichthys, and thus may represent a basal member of the group.[4][5] Xenocyprididae was previously considered to be a part of the family Cyprinidae, along with the Danionidae, Leuciscidae, Tincidae other related fish taxa.