Stenopterygius quadricissus, Ichthyosaur skull & Bones Troodon The Russian researcher Sergei Zimov

The Russian researcher Sergei Zimov estimates that during the last Ice Age

5 inches wide with an 8-inch-long root

Primitive members of the group include Nqwebasaurus

That name would later be amended by Richard Lydekker

Furthermore

Stenopterygius quadricissus, Ichthyosaur skull & Bones Troodon The Russian researcher Sergei ZimovStenopterygius quadriscissus is an extinct genus of ichthyosaur from the Early to Middle Jurassic from Europe. Maximum length was 4 m. 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. Ichthyosaur infants were born tail first, to prevent them from drowning before fully clearing the birth canal. Stenopterygius was a very fast