What is Acipenseriformes?
[[File:Atlantic sturgeon.jpg|thumb|[[Atlantic sturgeon]] (''Acipenser oxyrhynchus'')]] '''Acipenseriformes''', the [[sturgeon]]s, is an order of fish. '''Atlantic sturgeon''' is an example of sturgeon. Acipenseriformes live in freshwater lakes. The two most notable members are [[Sturgeon|sturgeons]] and [[paddlefish]]. == Description == Acipenseriformes have [[Ossification|ossified]] axial skeletons. The [[Quadratojugal bone|quadratojugal bones]] are three-pointed. == Classification == * Order '''Acipenseriformes''' <small>Berg, 1940</small> ** Genus †''[[Eochondrosteus]]'' <small>Lu, Li & Yang, 2005</small> ** '''Family''' †'''[[Chondrosteidae]]''' <small>Egerton, 1858</small> *** Genus †''[[Chondrosteus]]'' <small>Agassiz, 1833–1844</small> *** Genus †''[[Gyrosteus]]'' <small>Agassiz, 1833–1844</small> *** Genus †''[[Strongylosteus]]'' <small>Agassiz, 1833–1844</small> ** '''Family''' †'''[[Peipiaosteidae]]''' <small>Liu & Zhou, 1965</small> *** Genus †''Spherosteus'' <small>Jakovlev, 1968</small> *** Genus †''[[Yanosteus]]'' <small>Jin et al., 1995</small> *** Genus †''Liaosteus'' <small>Lu, 1995</small> *** Genus †''[[Peipiaosteus]]'' <small>Liu & Zhou, 1965</small> *** Genus †''Stichopterus'' <small>Reis, 1909</small> ** '''Suborder Acipenseroidei''' <small>Grande & Bemis, 1991</small> *** '''Family [[Paddlefish|Polyodontidae]]''' <small>Bonaparte, 1838</small> (paddlefish) **** Genus †''[[Protopsephurus]]'' <small>Lu, 1994</small> **** Genus †''Paleopsephurus'' <small>MacAlpin, 1941a</small> **** Genus †''Pugiopsephurus'' <small>Hilton et al., 2023</small> **** Genus †''[[Parapsephurus]]'' <small>Hilton et al., 2023</small> **** '''Subfamily''' '''Polyodontinae''' <small>Grande & Bemis, 1991 non Pflugfelder, 1934</small> ***** Genus †''[[Crossopholis]]'' <small>Cope, 1883</small> ***** Genus ''[[American paddlefish|Polyodon]]'' <small>Lacépède, 1797</small> (American paddlefish) ***** Genus †''[[Chinese paddlefish|Psephurus]]'' <small>Günther, 1873</small> (Chinese paddlefish) *** '''Family [[Sturgeon|A