Ptychoceratodus

Ptychoceratodus is an extinct genus of prehistoric sarcopterygians or lobe-finned fish originally named as a species of Ceratodus in 1837.[6][9][10] It was a lungfish from the Mesozoic era (Triassic-Cretaceous), and the only members of the family Ptychoceratodontidae.[11][12] One species, P. oldhami, was named in 2018 (final version published in 2020) based on remains from the Carnian-aged Tiki Formation (India).[5] The first named species, which is also the type species, is P. phillipsi, which was named in 1837 by Louis Agassiz as a species of Ceratodus and moved to a separate genus in 1926.[6]

Ptychoceratodus
Temporal range: Early Triassic-Late Cretaceous
~251–66 Ma
Fossilised scutes and jaw of Ptychoceratodus serratus
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Sarcopterygii
Subclass:
Dipnoi
Suborder:
Ceratodontoidei
Family:
†Ptychoceratodontidae
Genus:
†Ptychoceratodus

Jaekel, 1926
Binomial name
†Ptychoceratodus phillipsi
Agassiz, 1837
Species
  • †P. acutus Priem, 1924 (vide Martin, 1982)[1]
  • †P. cionei Apestigua et al., 2007[2]
  • †P. concinnus Meyer and Pleninger, 1844 (vide Martin, 1982)[1][3]
  • †P. cuyanus Agnolin et al., 2017[4]
  • †P. donensis Vorobyeva and Minikh, 1968 (vide Martin, 1982)[1]
  • †P. gracilis Vorobyeva and Minikh, 1968
  • †P. oldhami Bhat & Ray, 2018[5]
  • †P. ornatus Broom, 1908 (vide Martin, 1982)[1]
  • †P. phillipsi Agassiz, 1837 (vide Martin, 1982)[1][6]
  • †P. rectangulus Linck, 1936 (vide Martin, 1982)[1]
  • †P. serratus Agassiz, 1838 (vide Apestigua et al., 2007)[2][7]
  • †P. szecuhanensis Young, 1942 (vide Martin, 1982)[1][8]
  • †P. viropa Oldham, 1859 (vide Martin, 1982)[1]
  • †P. wichmanni Apestigua et al., 2007[2]
Synonyms
  • Ceratodus acutus Priem, 1924
  • Ceratodus concinnus Meyer & Pleninger, 1844
  • Ceratodus donensis Vorobyeva and Minikh, 1968
  • Ceratodus ornatus Broom, 1908
  • Ceratodus phillipsi Agassiz, 1836
  • Ceratodus rectangulus Linck, 1936
  • Ceratodus serratus Agassiz, 1838
  • Ceratodus szechuanensis Young, 1942
  • Ferganoceratodus szechuanensis Young, 1942
  • Ceratodus viropa Oldham, 1859

Fossil distribution

Fossils of Ptychoceratodus have been found in:[13]

Triassic
Jurassic
  • Kuangyuan Formation, Tithonian China (P. szechuanensis)
Cretaceous

See also
  • Sarcopterygii
  • List of sarcopterygians
  • List of prehistoric bony fish

References
  1. M. Martin. 1982. Nouvelles données sur la phylogénie et la systématique des dipneustes postpaléozoïques [New data on the phylogeny and systematics of post-Paleozoic dipnoans]. Comptes Rendues de l'Academie des Sciences, Paris, Série II 294:611-614 [M. Carrano/M. Carrano]
  2. S. Apesteguia, F. L. Agnolin, and K. Claeson. 2007. Review of Cretaceous dipnoans from Argentina (Sarcopterygii: Dipnoi) with descriptions of new species. Revista del Museo Argentino de Ciencias Naturales nueva serie 9(1):27-40
  3. H. v. Meyer and T. Plieninger. 1844. Beiträge zur Paläontologie Württemberg’s, enthaltend die Fossilen Wirbelthierreste aus den Triasgebilden mit Besonderer Rücksicht auf die Labyrinthodonten des Keupers [Contributions to the Paleontology of Württemberg, Including the Fossil Vertebrate Remains from the Triassic Formations with Special Regard to the Labyrinthodonts of the Keupers] 1-132
  4. F. L. Agnolin, S. Bogan, F. Brissón Egli, F. E. Novas, M. P. Isasi, C. Marsicano, A. Zavattieri and A. Mancuso. 2017. A new lungfish (Dipnoi) from the Late Triassic of South America. Journal of Vertebrate Paleontology 37(1):e1245665
  5. Mohd Shafi Bhat; Sanghamitra Ray (2020). "A record of new lungfishes (Osteichthyes: Dipnoi) from the Carnian (Upper Triassic) of India". Historical Biology: An International Journal of Paleobiology. 32 (3): 428–437. doi:10.1080/08912963.2018.1499020. S2CID 92040062.
  6. L. Agassiz. 1838. Recherches Sur Les Poissons Fossiles. Tome III (livr. 11). Imprimérie de Petitpierre, Neuchatel 73-140
  7. L. Agassiz. 1838. Recherches Sur Les Poissons Fossiles. Tome III (livr. 11). Imprimérie de Petitpierre, Neuchatel 73-140
  8. C.-C. Young. 1942. Fossil vertebrates from Kuangyuan, N. Szechuan, China. Bulletin of the Geological Society of China 22(-34):293-309
  9. "Fossilworks: Ptychoceratodus". fossilworks.org. Retrieved 2019-06-03.
  10. "FIGURE 2. Lower left tooth plate of Ptychoceratodus cuyanus (IANIGLA-PV..." ResearchGate. Retrieved 2019-06-03.
  11. Skrzycki, Piotr (2015-09-03). "New species of lungfish (Sarcopterygii, Dipnoi) from the Late Triassic Krasiejów site in Poland, with remarks on the ontogeny of Triassic dipnoan tooth plates". Journal of Vertebrate Paleontology. 35 (5): e964357. doi:10.1080/02724634.2015.964357. ISSN 0272-4634. S2CID 83615924.
  12. Cavin, Lionel; Longbottom, A. E.; Richter, Martha (2008). Fishes and the Break-up of Pangaea. Geological Society of London. ISBN 9781862392489.
  13. [ Ptychoceratodus] at Fossilworks.org


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