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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.
Ichthyosaur species varied from one to over sixteen metres in length.
Some early ichthyosaurs were durophagous and had flat convex teeth adapted for crushing shellfish.
There are some indications about the diving capacity of ichthyosaurs.
The fossil also documented that early ichthyosaurs were also born head first, perhaps opposed to later genera.
Little evidence is available about the nature of ichthyosaur social behaviour.
Additional evidence is provided by the eyes of ichthyosaurs that among vertebrates are both relatively and absolutely the largest known.
If authentic, the embryos of plesiosaurs would have been very small like those of ichthyosaurs.
