Named By: Erin E. Maxwell - 2010.
Synonyms: Ophthalmosaurus chrisorum.
Classification: Chordata, Reptilia, Ichthyosauria, Ophthalmosauridae.
Species: A. chrisorum (type), A. thalassonotus.
Known locations: Canada, Northwest Territories, Melville Island.
Time period: Oxfordian to Kimmeridgian of the Jurassic.
Fossil representation: Well preserved specimens.
Originally described as a species of Ophthalmosaurus (O. chrisorum) a 2010 study saw the specimens elevated to the level of a distinct genus of ichthyosaur. Arthropterygius was also considered to be similar to Caypullisaurus, but not all researchers have followed this and instead treat Arthropterygius as a basal (primitive) member of the Ophthalmosauridae.