Palaeonisciformes

The Palaeonisciformes are an extinct order of early ray-finned fishes (Actinopterygii) which began in the Late Silurian and ended in the Late Cretaceous. The name of the order is derived from the Greek words paleo (ancient) and ὀνίσκος (oniskos or woodlouse), probably pertaining to the organization of the fishes' scales, similar to the exoskeletal plating of woodlice.

Palaeonisciformes
Temporal range: Late Silurian–Late Cretaceous
Platysomus gibbosus
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Actinopterygii
Subclass:
Chondrostei[1]
Order:
Palaeonisciformes

Hay 1902
Families

Classification
Acropholis stensioei fossil at the Geological Museum in Copenhagen

It is not a natural group, but is instead a paraphyletic assemblage of the early members of several ray-finned fish lineages. It has traditionally encompassed most Paleozoic actinopterygians, except those that exhibit strange body forms (such as the deep-bodied Platysomoidea, or those assigned definitively to any of the living groups of ray-finned fishes.

Andreolepis hedei has proven so far to be the earliest-known actinopterygiian, living around 420 million years ago (Late Silurian in Russia, Sweden, Estonia, and Latvia. Actinopterygians underwent an extensive diversification during the Carboniferous, after the end-Devonian Hangenberg extinction.

Taxonomy
  • Order †Palaeonisciformes Hay, 1902 sensu stricto [Palaeoniscida Moy-Thomas & Miles, 1971][2][3][4]
    • Family †Palaeoniscidae Vogt, 1852
      • Genus ?†Agecephalichthys Wade, 1935
        • Species †Agecephalichthys granulatus Wade, 1935
      • Genus ?†Cryphaeiolepis Traquair, 1881
        • Species †Cryphaeiolepis scutata Traquair, 1881
      • Genus ?†Cteniolepidotrichia Poplin & Su, 1992
        • Species †Cteniolepidotrichia turfanensis Poplin & Su, 1992
      • 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 ?†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 ?†Xingshikous Liu, 1988
        • Species †Xingshikous xishanensis Liu, 1988
      • Genus ?†Yaomoshania Poplin et al., 1991
        • Species †Yaomoshania minutosquama Poplin et al., 1991
      • 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 †Palaeothrissum de Blainville, 1818
        • Species †P. elegans Sedgwick, 1829
        • Species †P. macrocephalum de Blainville, 1818
        • Species †P. magnum de Blainville, 1818
      • Genus †Westollia White & MoyThomas, 1940 [Lepidopterus Pohlig, 1892 non Agassiz, 1846]
      • 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]

Incertae sedis

Families that at one time or another were placed in the Palaeonisciformes:

  • †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
  • †Rhabdolepididae Gardiner, 1963
  • †Stegotrachelidae Gardiner, 1963
  • †Thrissonotidae Berg, 1955
  • †Tienshaniscidae Lu & Chen, 2010
  • †Turseodontidae Bock, 1959 corrig.
  • †Uighuroniscidae Jin, 1996
  • †Urosthenidae Woodward, 1931

Timeline of genera
CretaceousJurassicTriassicPermianCarboniferousDevonianSilurianOrdovicianCambrianLate CretaceousEarly CretaceousLate JurassicMiddle JurassicEarly JurassicLate TriassicMiddle TriassicEarly TriassicPennsylvanianMississippianPridoliLudlowWenlockLlandoveryAsarotusPsilichthysSonganellaHulettiaGyrosteusStrongylosteusCoccolepisChondrosteusCentrolepisPlesiococcolepisCosmolepisBrowneichthysFukangichthysScanilepisAegicephalichthysGyrolepidoidesCaruichthysDorsolepisGyrolepisBirgeriaBoreosomusAtopocephalaBroovaliaDaedalichthysDictyopypeEvenkiaHelichthysPteronisculusSakamenichthysStichopterusUrosthenesAmblypterinaAmblypterusChichiaEurynotoidesGardinerichthysInichthysKorutichthysNeuburgellaParalogoniscusRhabdolepisSinoniscusTienshaniscusTrachelacanthusBoreolepisPalaeoniscumAedullaBurbonellaDecazellaIgornellaWestolliaEigiliaPalaeothrissumUydeniaCharleuxiaHaplolepisIlliniichthysNozamichthysCoccocephalichthysParamblypterusCyranorhisBorichthysDwykiaWillomorichthysCycloptychiusRhadinichthysAetheretmonBendeniusCanobiusKentuckiaPhanerosteonStrepeoschemaSundayichthysAcrolepisBrachypareionCheirodopsisCornuboniscusCosmoptychiusDrydeniusElonichthysGonatodusMesolepisNematoptychiusParadrydeniusParagonatodusParamesolepisPlatysomusProtamblypteraStyracopterusWardichthysWatsonichthyesWhiteichthysTegeolepisMimiaMoythomasiaOrvikuinaStegotrachelusOsorioichthysDialiipinaLigulalepisLophosteusNaxilepisAndreolepisCretaceousJurassicTriassicPermianCarboniferousDevonianSilurianOrdovicianCambrianLate CretaceousEarly CretaceousLate JurassicMiddle JurassicEarly JurassicLate TriassicMiddle TriassicEarly TriassicPennsylvanianMississippianPridoliLudlowWenlockLlandovery

References
  1. "Palaeonisciformes". Paleobiology Database. Retrieved November 17, 2012.
  2. Haaramo, Mikko (2007). "Actinopterygii - Ray-finned Fishes". Mikko's Phylogeny Archive. Retrieved 30 December 2016.
  3. Nelson, Joseph S.; Grande, Terry C.; Wilson, Mark V. H. (2016). Fishes of the World (5th ed.). John Wiley & Sons. ISBN 9781118342336.
  4. van der Laan, Richard (2016). "Family-group names of fossil fishes". Cite journal requires |journal= (help)
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