One of the most popular marine reptiles in paleontology is Stenopterygius. It is not one of the most popular marine reptiles in the world of popular culture. Despite that fact, the ichthyosaur is well known, in part due to the fact that it has been discovered in the prime of motherhood. One of the most intriguing links describing this animal for the first time, to many people at least, is DK's online encyclopedia which shows an assortment of the creatures and highlights different aspects of their anatomy. There are also facts present in more ordinary sources like About and on the Bristol paleo page. The information from Bristol is not in depth, but they do provide a nice line drawing that could be used for coloring purposes.