Hiodontiformes

Hiodontiformes is an order of ray-finned fish consisting of the two living species of the mooneye family, Hiodontidae, and three extinct genera.
These are traditionally classified within the order Osteoglossiformes, a placement some authorities still follow. Fossil study of the extinct genus Yanbiania suggests that the hiodontids separated from other osteoglossomorphs early and thus may deserve a separate order.

Taxonomy

Order Hiodontiformes McAllister 1968 sensu Taverne 1979
* Genus †Chetungichthys Chang & Chou 1977
** †Chetungichthys brevicephalus Chang & Chou 1977
** †Chetungichthys dalinghensis Su 1991
* Genus †Yanbiania Li 1987
** †Yanbiania wangqingica Li 1987
* Genus †Plesiolycoptera Zhang & Zhou 1976
** †Plesiolycoptera daqingensis Zhang & Zhou 1976
** †Plesiolycoptera parvus
* Family Hiodontidae Valenciennes 1846 sensu stricto
** Genus Hiodon Lesueur 1818 ; Hiodon Rafinesque [1820; Clodalus ; Hiodon Gill & Jordan ex Jordan 1877; Elattonistius
*** Hiodon alosoides
*** †Hiodon consteniorum Li & Wilson 1994
*** †Hiodon falcatus
*** †Hiodon rosei
*** Hiodon tergisus Lesueur 1818
*** †Hiodon woodruffi Wilson, 1978
*** †Hiodon shuyangensis Shen 1989