Ptychoceratodus

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Ptychoceratodus
Temporal range: Early Triassic-Middle Jurassic
~251–163  Ma
Ptychoceratodus serratus.JPG
Skull roof bones and jaws of Ptychoceratodus serratus
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Clade: Sarcopterygii
Class: Dipnoi
Family: Ptychoceratodontidae
Martin, 1982
Genus: Ptychoceratodus
Jaekel, 1926
Type species
Ptychoceratodus phillipsi
Agassiz, 1837
Species
  • P. acutusPriem, 1924 (vide Martin, 1982) [1]
  • P. cioneiApestigua et al., 2007 [2]
  • P. concinnusMeyer and Pleninger, 1844 (vide Martin, 1982) [1] [3]
  • P. cuyanusAgnolin et al., 2017 [4]
  • P. donensisVorobyeva and Minikh, 1968 (vide Martin, 1982) [1]
  • P. gracilisVorobyeva and Minikh, 1968
  • P. oldhamiBhat & Ray, 2018 [5]
  • P. ornatusBroom, 1908 (vide Martin, 1982) [1]
  • P. phillipsiAgassiz, 1837 (vide Martin, 1982) [1] [6]
  • P. rectangulusLinck, 1936 (vide Martin, 1982) [1]
  • P. serratusAgassiz, 1838 (vide Apestigua et al., 2007) [2] [6]
  • P. szecuhanensis Young, 1942 (vide Martin, 1982) [1] [7]
  • P. viropaOldham, 1859 (vide Martin, 1982) [1]
  • P. wichmanniApestigua et al., 2007 [2]
Synonyms
  • Ceratodus acutusPriem, 1924
  • Ceratodus concinnusMeyer & Pleninger, 1844
  • Ceratodus donensisVorobyeva and Minikh, 1968
  • Ceratodus ornatus Broom, 1908
  • Ceratodus phillipsi Agassiz, 1836
  • Ceratodus rectangulusLinck, 1936
  • Ceratodus serratusAgassiz, 1838
  • Ceratodus szechuanensisYoung, 1942
  • Ferganoceratodus szechuanensisYoung, 1942
  • Ceratodus viropaOldham, 1859

Ptychoceratodus is an extinct genus of lungfish living from Early Triassic to Middle Jurassic. It was established by Otto Jaekel for one species (P. runcinatus), transferred from Ceratodus genus. [8] Type species is P. serratus from the Middle Triassic of Switzerland and Germany. [8] [9] Ptychoceratodus had two pairs of massive dental plates, bearing 4-6 acute ridges. Its skull roof was composed from massive, plate-like bones. In the central part of skull roof was localized an unossified fenestra. Most of the Ptychoceratodus findings are isolated dental plates, some associated with jaws. Other parts of skull or postcranial skeleton are relatively rarely found as fossils. The anatomy of skull is the best recognized in P. serratus, [9] whereas less complete cranial material is available also for P. concinuus, P. phillipsi, and P. rectangulus. [10] Although Ptychoceratodus is known exclusively from the Triassic and Jurassic, [11] there were also Cretaceous specimens referred to this genus. However, they are more often regarded as representants of Metaceratodus . [12] Ptychoceratodus is the only member of the family Ptychoceratodontidae. [13] [14] The first named species is P. phillipsi by Louis Agassiz in 1837 as a species of Ceratodus and later moved to the genus Ptychoceratodus. [6] Occurrences of Ptychoceratodus come mainly from Europe. [15] [8] However, occurrences from other continents suggest it was dispersed globally during the Triassic. [15] After 2010, the new fossil material behind the Europe was reported from South America, [16] India, [5] and Greenland [10]

Contents

Fossil distribution

Fossils of Ptychoceratodus have been found in: [17]

Triassic
Jurassic

See also

Related Research Articles

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References

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