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meaning: "frozen wing (wing as in flipper"
Named By: Patrick S. Druckenmiller, Joern H. Hurum, Espen M. Knutsen & Hans Arne Nakrem in 2012
Time Period: Late Jurassic, Tithonian
Location: Norway, Spitsbergen - Agardhfjellet Formation, Slottsmoeya Member
Size: Length of the preserved holotype is 4.6 meters long. Length of the complete animal in life estimated about 5 - 5.5 meters long
Diet: Piscivore/Carnivore
Fossil(s): Single individual including an almost complete articulated skull and post cranial skeleton, lacking part of the tail
Classification: | Chordata | Reptilia | Ichthyosauria | Ophthalmosauridae |

Cryopterygius (meaning 'frozen fin' in Greek) is an extinct genus of ophthalmosaurid ichthyosaurian known from the uppermost Jurassic of Central Spitsbergen, Norway. It is known from a single, but largely complete specimen from the Slottsmoya Member of the Agardhfjellet Formation (middle Volgian/late Tithonian, Late Jurassic). At 5.0-5.5 m total length, it is a large ichthyosaur. The type species is Cryopterygius kristiansenae Druckenmiller et al., 2012. A second species, C. kielanae, was found in the Kcynia Formation from the Late Jurassic of Poland.

Read more about Cryopterygius at Wikipedia
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