Palaeonisciformes

*]]
The **Palaeonisciformes** (Palaeoniscida) are an extinct order of early ray-finned fishes. Palaeonisciformes *sensu lato* first appeared in the fossil record in the Late Silurian and last appeared in the Late Cretaceous. The name is derived from the Ancient Greek words παλαιός (*palaiós*, ancient) and ὀνίσκος (*oniskos'', 'cod-fish' or woodlouse), probably pertaining to the organization of the fishes' scales, similar to the exoskeletal plating of woodlice.

## Classification 
* **Order** †**Palaeonisciformes** Hay, 1902 *sensu stricto* [Palaeoniscida Moy-Thomas & Miles, 1971]
** **Family** †**Palaeoniscidae** Vogt, 1852
*** Genus ?†*Agecephalichthys* Wade, 1935
**** Species †*Agecephalichthys granulatus* Wade, 1935
*** Genus ?†*Atherstonia* Woodward, 18989 [*Broometta* Chabakov, 1927]
**** Species †*Atherstonia scutata* Woodward, 1889 [*Atherstonia cairncrossi* Broom, 1913; *Amblypterus capensis* Broom, 1913; *Broometta cairncrossi* Chabakov, 1927]
**** Species †*Atherstonia minor* Woodward, 1893
*** Genus ?†*Cryphaeiolepis* Traquair, 1881
**** Species †*Cryphaeiolepis scutata* Traquair, 1881
*** Genus ?†*Cteniolepidotrichia* Poplin & Su, 1992
**** Species †*Cteniolepidotrichia turfanensis* Poplin & Su, 1992
*** Genus †*Dicellopyge* Brough, 1931
**** Species †*Dicellopyge macrodentata* Brough, 1931
**** Species †*Dicellopyge lissocephalus* Brough, 1931
*** Genus ?†*Duwaichthys* Liu *et al.*, 1990
**** Species †*Duwaichthys mirabilis* Liu *et al.*, 1990
*** Genus ?†*Ferganiscus* Sytchevskaya & Yakolev, 1999
**** Species †*Ferganiscus osteolepis* Sytchevskaya & Yakolev, 1999
*** Genus †*Gyrolepis* Agassiz, 1833 non Kade, 1858
**** Species †*G. albertii* Agassiz, 1833
**** Species †*G. gigantea* Agassiz, 1833
**** Species †*G. maxima* Agassiz, 1833
**** Species †*G. quenstedti* Dames, 1888
**** Species †*G. tenuistriata* Agassiz, 1833
*** Genus †*Gyrolepidoides* Cabrera, 1944
**** Species †*G. creyanus* Schaeffer, 1955
**** Species †*G. cuyanus* Cabrera, 1944
**** Species †*G. multistriatus* Rusconi, 1948
*** Genus ?†*Palaeoniscinotus* Rohon, 1890
**** Species †*P. czekanowskii* Rohon, 1890
*** Genus †*Palaeoniscum* de Blainville, 1818 [*Palaeoniscus* Agassiz, 1833 non Von Meyer, 1858; *Palaeoniscas* Rzchak, 1881; *Eupalaeoniscus* Rzchak, 1881; *Palaeomyzon* Weigelt, 1930; *Geomichthys* Sauvage, 1888]
**** Species †*P. angustum* (Rzehak, 1881) [*Palaeoniscas angustus* Rzehak, 1881]
**** Species †*P. antipodeum* (Egerton, 1864) [*Palaeoniscus antipodeus* Egerton, 1864]
**** Species †*P. antiquum* Williams, 1886
**** Species †*P. arenaceum* Berger, 1832
**** Species †*P. capense* (Bloom, 1913) [*Palaeoniscus capensis* Bloom, 1913]
**** Species †*P. comtum* (Agassiz, 1833) [*Palaeoniscus comtus* Agassiz, 1833]
**** Species †*P. daedalium* Yankevich & Minich, 1998
**** Species †*P. devonicum* Clarke, 1885
**** Species †*P. elegans* (Sedgwick, 1829) [*Palaeoniscus elegans* Sedgwick, 1829]
**** Species †*P. freieslebeni* de Blainville, 1818 [*Eupalaeoniscus freieslebeni* (de Brainville, 1818); *Palaeoniscus freieslebeni* (de Brainville, 1818)]
**** Species †*P. hassiae* (Jaekel, 1898) [*Galeocerdo contortus hassiae* Jaekel, 1898; *Palaeomyzon hassiae* (Jaekel, 1898)]
**** Species †*P. kasanense* Geinitz & Vetter, 1880
**** Species †*P. katholitzkianum* (Rzehak, 1881) [*Palaeoniscas katholitzkianus* Rzehak, 1881]
**** Species †*P. landrioti* (le Sauvage, 1890) [*Palaeoniscus landrioti* le Sauvage, 1890]
**** Species †*P. longissimum* (Agassiz, 1833) [*Palaeoniscus longissimus* Agassiz, 1833]
**** Species †*P. macrophthalmum* (McCoy, 1855) [*Palaeoniscus macrophthalmus* McCoy, 1855]
**** Species †*P. magnum* (Woodward, 1937) [*Palaeoniscus magnus* Woodward, 1937]
**** Species †*P. moravicum* (Rzehak, 1881) [*Palaeoniscas moravicus* Rzehak, 1881]
**** Species †*P. promtu* (Rzehak, 1881) [*Palaeoniscas promtus* Rzehak, 1881]
**** Species †*P. reticulatum* Williams, 1886
**** Species †*P. scutigerum* Newberry, 1868
**** Species †*P. vratislavensis* (Agassiz, 1833) [*Palaeoniscus vratislavensis* Agassiz, 1833]
*** Genus †*Palaeothrissum* de Blainville, 1818
**** Species †*P. elegans* Sedgwick, 1829
**** Species †*P. macrocephalum* de Blainville, 1818
**** Species †*P. magnum* de Blainville, 1818
*** Genus ?†*Shuniscus* Su, 1983
**** Species †*Shuniscus longianalis* Su, 1983
*** Genus ?†*Suchonichthys* Minich, 2001
**** Species †*Suchonichthys molini* Minich, 2001
*** Genus ?†*Trachelacanthus* Fischer De Waldheim, 1850
**** Species †*Trachelacanthus stschurovskii* Fischer De Waldheim, 1850
*** Genus ?†*Triassodus* Su, 1984
**** Species †*Triassodus yanchangensis* Su, 1984
*** Genus ?†*Turfania* Liu & Martínez, 1973
**** Species †*T. taoshuyuanensis* Liu & Martínez, 1973
**** Species †*T. varta* Wang, 1979
*** Genus ?†*Turgoniscus* Jakovlev, 1968
**** Species †*Turgoniscus reissi* Jakovlev, 1968
*** Genus ?†*Weixiniscus* Su & Dezao, 1994
**** Species †*Weixiniscus microlepis* Su & Dezao, 1994
*** Genus ?†*Xingshikous* Liu, 1988
**** Species †*Xingshikous xishanensis* Liu, 1988
*** Genus ?†*Yaomoshania* Poplin *et al.*, 1991
**** Species †*Yaomoshania minutosquama* Poplin *et al.*, 1991

'']]

### Other families attributed to Palaeonisciformes 
This list includes families that at one time or another were placed in this order.

* †Acropholidae Kazantseva-Selezneva, 1977
* †Atherstoniidae Gardiner, 1969
* †Brazilichthyidae Cox & Hutchinson, 1991
* †Centrolepididae Gardier, 1960
* †Coccolepididae Berg, 1940 corrig.
* †Commentryidae Gardiner, 1963
* †Cryphiolepididae MoyThomas, 1939 corrig.
* †Dwykiidae Gardiner, 1969
* †Holuridae Moy-Thomas, 1939
* †Igornichthyidae Heyler, 1977
* †Irajapintoseidae Beltan, 1978
* †Monesedeiphidae Beltan, 1989
* †Moythomasiidae Kazantseva, 1971
* †Rhabdolepididae Gardiner, 1963
* †Stegotrachelidae Gardiner, 1963
* †Thrissonotidae Berg, 1955
* †Tienshaniscidae Lu & Chen, 2010
* †Turseodontidae Bock, 1959 corrig.
* †Uighuroniscidae Jin, 1996
* †Urosthenidae Woodward, 1931

## Related pages 
* Acentrophorus
* Palaeoniscidae

## References 
# "Palaeonisciformes". Paleobiology Database. Retrieved November 17, 2012.