Ovalentaria is a clade of ray-finned fishes within the Percomorpha. It includes the order Stiassnyiformes. Some authors have used it for a clade including Mugiloidei, Plesiopidae, Blenniiformes, Atherinomorpha, and Cichlidae. It was named by W. L. Smith and T. J. Near in Wainwright in 2012.

• Order Atheriniformes

• Suborder Atherinopsoidei
  • Family Atherinopsidae (Neotropical silversides)
• Suborder Atherinoidei
  • Family Atherinidae (Old World silversides)
  • Family Dentatherinidae (Mercer's tusked silverside)

1. J. S. Nelson; T. C. Grande; M. V. H. Wilson (2016). Fishes of the World (5th ed.). Wiley. p. 752. ISBN 978-1-118-34233-6.