Platysomus, from here.

Belongs within: Actinopteri.

The Palaeonisciformes are an early group of heavily scaled ray-finned fishes known from the Devonian to the Cretaceous (Bond 1996).

Characters (from Bond 1996): Body form varying from fusiform to compressiform; usually covered by ganoid scales. Head large, bony; mouth generally long, teeth conical; maxillary large, probably not movable.

<==Palaeonisciformes [Platysomiformes]
    |  i. s.: Pygopteridae P99
    |           |--Watsonichthys pectinatus (Traquair 1877) P99
    |           |--Nematoptychius Traquair 1875 P99
    |           |    `--*N. greenocki Traquair 1875 P99
    |           `--Progyrolepis Fritsch 1895 P99
    |                |--*P. speciosus (Fritsch 1875) P99
    |                |--P. heyleri Poplin 1999 P99
    |                `--P. tricessimalaris Dunkle 1946 P99
    |--Redfieldioidei B96
    |--Dorypteroidei B96
    |--Palaeoniscus M79 [Palaeoniscidae, Palaeoniscoidei B96]
    |    `--P. macropomus M79
    `--Platysomoidei B96
         |--Chirondontidae B96
         `--Platysomidae PL00
              |--Kargalichthys TT05
              |    |--K. efremovi Minikh 1986 TT05
              |    `--K. pritokensis Minikh 1992 TT05
              `--Platysomus PL00
                   |--P. bashkirus Minikh 1992 TT05
                   |--P. biarmicus Von Eichwald 1861 TT05
                   |--P. soloduchi Minikh 1992 TT05
                   `--P. superbus PL00

*Type species of generic name indicated


[B96] Bond, C. E. 1996. Biology of Fishes 2nd ed. Saunders College Publishing: Fort Worth.

[M79] Müller, A. H. 1979. Fossilization (taphonomy). In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A2–A78. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[P99] Poplin, C. 1999. Un paléoniscoïde (Pisces, Actinopterygii) de Buxières-les-Mines, témoin des affinités fauniques entre Massif central et Bohême au passage Carbonifère-Permien. Geodiversitas 21 (2): 147–155.

[PL00] Poplin, C., & R. Lund. 2000. Two new deep-bodied palaeoniscoid actinopterygians from Bear Gulch (Montana, USA, Lower Cretaceous). Journal of Vertebrate Paleontology 20 (3): 428–449.

[TT05] Tverdokhlebov, V. P., G. I. Tverdokhlebova, A. V. Minikh, M. V. Surkov & M. J. Benton. 2005. Upper Permian vertebrates and their sedimentological context in the South Urals, Russia. Earth-Science Reviews 69: 27–77.

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