The habits of Stenopterygius were similar to those of present-day dolphins. It spent most of its life in the open sea, where it hunted fish, cephalopods and other animals. The abdominal cavity of skeletons of this ichthyosaur often contains the remains of such food.
One famous fossil is that of a mother and baby that died in childbirth (ichthyosaurs were viviparous). This proved that ichthyosaur infants were born tail-first, just like cetaceans, to prevent them from drowning before fully clearing the birth canal.
NEW METRICS TO DIFFERENTIATE SPECIES OF STENOPTERYGIUS (REPTILIA: ICHTHYOSAURIA) FROM THE LOWER JURASSIC OF SOUTHWESTERN GERMANY
Jan 01, 2012; ABSTRACT- Ichthyosaurs represent one of the most highly specialized lineages of marine reptiles, but our understanding of the...