Aspidorhynchiformes is an extinct order of ray-finned fish that lived from the Middle Jurassic to the late Paleocene. They only have one family, Aspidorhynchidae. The most famous is Aspidorhynchus.

• Order †Aspidorhynchiformes Bleeker 1859 [Aspidorhynchida; Aspidorhynchoidei Bleeker 1859]
  • Family †Aspidorhynchidae Bleeker 1859 [Vinctiferidae Silva Santos 1990; Diphyodontidae Jordan 1923]
    • Genus †Jonoichthys Gouiric-Cavalli 2015
    • Genus ?†Ophirachis Costa 1854
    • Genus †Platycerhynchus Costa 1864
    • Genus †Pseudovinctifer Arratia 2015
    • Genus †Richmondichthys Bartholomai 2004
    • Genus †Aspidorhynchus Agassiz 1833 non Fitzinger 1843
    • Genus †Belonostomus Agassiz 1834 [Dichelospondylus Costa 1856; Hemirhynchus Kner 1867 non Agassiz 1844 non Hodgson 1843; Diphyodus Lambe 1902]
    • Genus †Vinctifer Jordan 1920

The Aspidorhynchiformes are best known for their elongated, pointy rostrums. They are formed from fused premaxillary bones.

1. Van Vranken, Nathan; Fielitz, Christopher; Ebersole, Jun (2019). "New Belonostomus record". Palaeontologia Electronica.