Ischyrodon

Ischyrodon is a dubious genus of large, carnivorous marine reptile belonging to the Pliosauroidea, a clade of short-necked plesiosaurs and it is known from the Middle Jurassic (Callovian) of Wölflinswil, Switzerland. The type species is I. meriani, and was previously listed as a synonym of Liopleurodon ferox.

Ischyrodon
Temporal range: Middle Jurassic,
NMB L.D.37, the holotype tooth crown; in (A) mesial, (B) lingual, (C) apical, (D) labial, and (E) distal view
Scientific classification
Kingdom:
Animalia
Phylum:
Chordata
Class:
Reptilia
Order:
†Plesiosauria
Suborder:
†Pliosauroidea
Family:
†Pliosauridae
(unranked):
†Thalassophonea
Genus:
†Ischyrodon

von Meyer, 1838
Binomial name
†Ischyrodon meriani
von Meyer, 1838 vide von Meyer, 1856

Ischyrodon was named in 1838 and described in 1856 by Hermann von Meyer. Lambert Beverly Tarlo noted the possibility of it pertaining to Liopleurodon in 1960. A 2022 study by Daniel Madzia and colleagues noted that while the tooth likely came from Liopleurodon or something similar, there was too little information available to make a confident assignment, so they treated Ischyrodon as a nomen dubium and did not synonymise Ischyrodon with Liopleurodon.

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