0 a type of reptile that lived in the sea, that existed from about 250 million to 90 million years ago --
If authentic, the embryos of plesiosaurs would have been very small like those of ichthyosaurs.
Additional evidence is provided by the eyes of ichthyosaurs that among vertebrates are both relatively and absolutely the largest known.
Little evidence is available about the nature of ichthyosaur social behaviour.
The fossil also documented that early ichthyosaurs were also born head first, perhaps opposed to later genera.
There are some indications about the diving capacity of ichthyosaurs.
Some early ichthyosaurs were durophagous and had flat convex teeth adapted for crushing shellfish.
Ichthyosaur species varied from one to over sixteen metres in length.
Ultimately, over four thousand would be uncovered, forming the bulk of ichthyosaur specimens today displayed.
