Platypterygius

Platypterygius ('Flat wing (flipper)', von Huene 1922) is an ichthyosaur of the family Ophthalmosauridae. It is most closely related to the genera Caypullisaurus and Brachypterygius.

Discovery and species
Fossils are known from Australia, Russia, United States of America, Colombia,[3] Western Europe and possibly New Zealand. There are seven named species. Both adults and juveniles have been unearthed, including newborns and pregnant females. Like other ichthyosaurs, Platypterygius gave live birth.

The remains from Australia were originally called Ichthyosaurus australis. They are from the Toolebuc Formation and Allaru Mudstone (Albian, Lower Cretaceous) of Flinders River and other localities in north central Queensland. In 1990 Wade erected the species name P. longmani to include all remains previously referred to I. australis.

The cladogram below follows the topology from a 2010 analysis by Patrick S. Druckenmiller and Erin E. Maxwell.

Paleobiology
Platypterygius reached a length of about 7 m (23 ft). It had a long snout and a powerful finned tail. There are more digits in the front flippers than is usual in ichthyosaurs; they are tightly bound in rows, giving a broad, flat appearance[citation needed]. This unusual characteristic gives the genus its name, meaning 'flat wing.' Furthermore, some of the wrist bones have disappeared entirely.[citation needed] CAT scans on a juvenile specimen strongly suggest that Platypterygius was deaf.