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Palvennia is an extinct genus of ophthalmosaurid ichthyosaurian known from the uppermost Jurassic of Central Spitsbergen , Norway .. extinct. extinct. genus. genus. ophthalmosaurid. ophthalmosaurid. Jurassic. Jurassic. Spitsbergen. Spitsbergen. Norway. Norway. It was named for PalVenn , the Friends of the Palaeontological Museum in Oslo , whose expedition led to the discovery of the type specimen .. Palvennia is known from a single skull from the Slottsmøya Member of the Agardhfjellet Formation -LRB- middle Volgian / late Tithonian , Late Jurassic -RRB- .. Late Jurassic. Late Jurassic. Jurassic. Jurassic. Tithonian. Tithonian. The skull is 860 mm long , but is unusual in having a very short rostrum -LRB- ~ 0.6 × the skull length -RRB- , similar to Ichthyosaurus breviceps .. Ichthyosaurus. Ichthyosaurus. Because of this , the orbit seems very large -LRB- 0.34 × the skull length -RRB- , but this may be effected by crushing .. The single and only known species is Palvennia hoybergeti Druckenmiller et al. , 2012 .. 2012 in paleontology