0 a type of reptile that lived in the sea, that existed from about 250 million to 90 million years ago
This limitation also precludes the estimation of errors in the application of the algebraic methods on the ichthyosaur example.
The eye sockets are protected by a bony ring, a feature shared by birds and some ichthyosaurs.
It also occurs secondarily in some later tetrapods, such as ichthyosaurs.
Above the sea bed, the shallower waters supported ammonites, fish, and marine reptiles (ichthyosaurs and plesiosaurs).
At about the same time, the museum possessed a fossil of an ichthyosaur.
At 5.05.5 m total length, it is a large ichthyosaur.
Among them were three models of an ichthyosaur.
Ultimately, over four thousand would be uncovered, forming the bulk of ichthyosaur specimens today displayed.
