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Pygopterus; Temporal range: Wuchiapingian–Olenekian PreꞒ Ꞓ O S D C P T J K Pg N
	P. humboldti fossil; (Museum of Paleontology, Tübingen)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Family:	†Pygopteridae
Genus:	†Pygopterus; Agassiz, 1833
Type species
	†Palaeothrissium humboldti; Blainville, 1818
Other species
	†P. degeeri Stensiö, 1921; †P. crecelli Wilser, 1923; †P. gleerupi Aldinger, 1937; †P. nielseni Aldinger, 1937;

Pygopterus is an extinct genus of prehistoric bony fish that lived during the Wuchiapingian to Olenekian ages (late Permian to Early Triassic epochs) in what is now England, Germany (Baden-Württemberg, Saxony-Anhalt), Greenland and Svalbard (Spitsbergen).^[2]^[3] It is one of the few genera of ray-finned fish known to cross the Permian-Triassic boundary.^[3]

Fossils have been found in the Marl Slate Formation, Kupferschiefer (Werra Formation), Ravnefjeld Formation, Vikinghøgda Formation and Buntsandstein.^[1]^[2] A report about the discovery of this fish in Westphalian deposits of Belgium was likely caused by the presence of Nematoptychius which was referred to as Pygopterus in late 19th century.^[4]

Synonyms

Pygopterus greenockii Traquair, 1866 → Nematoptychius greenockii (Traquair, 1866)^[1]

^ ^a ^b ^c Schultze, Hans-Peter; Mickle, Kathryn E.; Poplin, Cecile; Hilton, Eric J.; Grande, Lance (2021). Handbook of Paleoichthyology, 8A. Actinopterygii I. Palaeoniscimorpha, Stem Neopterygii, Chondrostei. Dr. Friedrich Pfeil, München. p. 299. ISBN 978-3-89937-272-4.
^ ^a ^b Aldinger, Hermann (1937). "Permische Ganoidfische aus Ostgrönland". Meddelelser om Grønland (in German). 102 (3): 1–392.
^ ^a ^b Romano, Carlo; Koot, Martha B.; Kogan, Ilja; Brayard, Arnaud; Minikh, Alla V.; Brinkmann, Winand; Bucher, Hugo; Kriwet, Jürgen (2016). "Permian-Triassic Osteichthyes (bony fishes): diversity dynamics and body size evolution". Biological Reviews. 91 (1): 106–147. doi:10.1111/brv.12161. PMID 25431138. S2CID 5332637.
^ C. Derycke, R. Cloutier, A.-M. Candilier (1995). "Palaeozoic vertebrates of northern France and Belgium: Part II - Chondrichthyes, Acanthodii, Actinopterygii (Uppermost Silurian to Carboniferous)". Geobios. 28 (1889–1890): 347. doi:10.1016/S0016-6995(95)80136-7.{{cite journal}}: CS1 maint: multiple names: authors list (link)