Edestus

Edestus
Temporal range: Pennsylvanian (Bashkirian to Moscovian) 313–307 Ma
Artist's reconstruction
Scientific classification
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Edestus

Leidy, 1856

Edestus is an extinct genus of eugeneodontid fish from the Pennsylvanian of the UK, Russia, and the United States. Similar to Helicoprion, it had tooth whorls which were embedded in the lower jaw. However, it also had teeth on its upper jaw. The largest species, E. heinrichi, is estimated to have reached greater than 6.7 m (22 ft) in length, around the size of the largest known great white shark, possibly making it the largest marine predator to have ever existed up to that point.[1]

Description

Its skeleton was made of cartilage. So if it decayed, it would vanish, unless preserved by exceptional circumstances.

The teeth of Edestus, much like the more famous Helicoprion, are serrated and located on a structure known as a tooth whorl.

Species and distribution

Asymmetric crowns

  • E. triserratus Newton, 1904 (syn Edestus minusculus Hay, 1909, Edestodus kolomnensis (Lebedev, 2001) Late Bashkirian to Moscovian, United States, United Kingdom and Russia
  • E. minor Newberry in Newberry and Worthen, 1866 (syn E. mirus Hay, 1912E. pringlei Watson, 1930) Late Bashkirian to Moscovian, United States and United Kingdom
Comparison of the four species of Edestus

Symmetric crowns

  • E. heinrichi Newberry and Worthen, 1870 (syn E. protopirata Trautschold, 1879, Protopirata centrodon Trautschold, 1888, E. karpinskyi Missuna, 1908, E. crenulatus Hay, 1909, E. serratus Hay, 1909) Moscovian of the United States and Russia
  • E. vorax Leidy, 1856 (syn E. giganteus Newberry, 1889) Moscovian of the United States

References

  1. Engelman, Russell K. (2023). "A Devonian Fish Tale: A New Method of Body Length Estimation Suggests Much Smaller Sizes for Dunkleosteus terrelli (Placodermi: Arthrodira)". Diversity.

Other websites

Media related to Edestus at Wikimedia Commons

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