Ophthalmothule

Opthalmothule (meaning "eye of the north"), was a cryptoclidid plesiosaur dating to the latest Volgian (around the Jurassic-Cretaceous boundary), found in the Slottsmøya Member Lagerstätte of the Agardhfjellet Formation in Spitsbergen. The type species is O. cryostea.[1]

Ophthalmothule
Temporal range: Tithonian-Berriasian
~145 Ma
↓
Quarry map (A) and reconstruction (B) of holotype skeleton
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: †Sauropterygia
Order: †Plesiosauria
Family: †Cryptoclididae
Genus: †Ophthalmothule
Roberts et al., 2020
Type species
†Ophthalmothule cryostea
Roberts et al., 2020

Description
Size comparison

Opthalmothule was about 5 metres (16 ft) long. It was noted to have unusually large eye sockets, which suggests a paleobiological specialization, such as deep water and/or nocturnal hunting. Along with Abyssosaurus, it is one of the youngest cryptoclidids known from boreal regions. The holotype is known from skeletal material that includes a complete cranium and a partial mandible, a complete and articulated cervical vertebrae, a set of pectoral and anterior to middle dorsal series, and the pectoral girdle and anterior humeri.[1]

References
  1. Roberts, A.J.; Druckenmiller, P.S.; Cordonnier, B.; Delsett, L.L.; Hurum, J.H. (2020). "A new plesiosaurian from the Jurassic–Cretaceous transitional interval of the Slottsmøya Member (Volgian), with insights into the cranial anatomy of cryptoclidids using computed tomography". PeerJ. 8: e8652. doi:10.7717/peerj.8652.


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