Petalodus is an extinct genus of cartilaginous fish from the Pennsylvanian to the Permian,[6][7] known from subtriangular to rhomboidal teeth.[7] The genus was named by Richard Owen in 1840 and the type species is Petalodus hastingsii.[2][3][4][5] The only dubious species within this genus is P. securiger.[8][9]

Temporal range: Pennsylvanian–Permian
Petalodus ohioensis fossil.jpg
P. ohioensis tooth
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Petalodontiformes
Family: Petalodontidae
Genus: Petalodus
Owen, 1840
Type species
Petalodus hastingsii
Owen, 1840[2][3][4][5]
Other species
  • P. acuminatus Agassiz, 1838
  • P. allegheniensis Leidy, 1856
  • P. arcuatus St. John, 1870
  • P. davisii Woodward, 1889
  • P. destructor Newberry & Worthen, 1870
  • P. flabulella Woodward, 1889
  • P. grandis Davis, 1883
  • P. jewetti Miller, 1957[1]
  • P. luminaries Agassiz, 1838
  • P. ohioensis Safford, 1851
  • P. sagittatus Agassiz, 1843
  • P. securiger? Hay, 1895
  • Getalodus Safford, 1853
  • Sicarius Leidy, 1856


  1. ^ Halsey W. Miller, Jr.; Transactions of the Kansas Academy of Science (1903-) Vol. 60, No. 1 (Spring, 1957), pp. 82-85
  2. ^ a b Report on the Geology of the County of Londonderry, and of Parts of Tyrone and Fermanagh. Memoirs of the Geological Survey of the United Kingdom, district mem. Geol. Surv. Ireland, Dublin, xxxi + 784 pp., A. Milliken, 1843, 784pp
  3. ^ a b Petalodus hastingsii OWEN, 1840: In: Database of fossil elasmobranch teeth, World Wide Web electronic publication, Version 07/2020
  4. ^ a b Case 3779 – Petalodus Owen, 1840 (Chondrichthyes, Petalodontiformes, Petalodontidae): proposed conservation of usage by designation of a neotype for its type species Petalodus hastingsii Owen, 1840. Bulletin of Zoological Nomenclature, 75: 241-246
  5. ^ a b A synopsis of the classification of the British Palæozoic rocks, with a systematic description of the British Palæozoic fossils in the Geological museum of the University of Cambridge. In: Sedgwick, A. (ed), A synopsis of the classification of the British Palæozoic rocks, London :J.W. Parker and Son; [etc.] 1855.
  6. ^ A. S. Woodward. 1889. Catalogue of the Fossil Fishes in the British Museum (Natural History) Part 1 1-613.
  7. ^ a b Fossils (Smithsonian Handbooks) by David Ward (Page 198)
  8. ^ Description of a new species of Petalodus (P. securiger) from the Carboniferous of Illinois. Journal of Geology, 3 (5): 561–564
  9. ^ Handbook of Paleoichthyology, Vol. 3D: Chondrichthyes Paleozoic Elasmobranchii: Teeth Verlag Dr. Friedrich Pfeil, pp. 168, 154 fig., 4 Tab.