Echidnocephalus (Greek for "Echidna's head") is an extinct genus of prehistoric halosaur known from the Late Cretaceous.

tenuicaudus von der Marck, 1858) from the late Campanian-aged Ahlen Formation of Westphalia, Germany.

[3] These body fossils suggest an animal already very similar to modern halosaurs.

[2] In addition, two disputed species known only from isolated fossil scales very similar to those of modern halosaurs have been described from North America: ?E.

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