Platypterygius

Platypterygius is an ichthyosaur of the family Ophthalmosauridae. It is most closely related to the genera "Caypullisaurus" and "Brachypterygius". The ichthyosaur lived from the Early Cretaceous period (Hauterivian stage) to the earliest Late Cretaceous period (Cenomanian stage) and had a cosmopolitan distribution.
Description.
"Platypterygius" reached a length of about . 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 . This unusual characteristic gives the genus its name, meaning 'flat wing.' Furthermore, some of the wrist bones have disappeared entirely. CAT scans on a juvenile specimen strongly suggest that "Platypterygius" was deaf.
Discovery and species.
There are eight named species. Both adults and juveniles have been unearthed, including newborns and pregnant females which indicate that, 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".
Classification.
The cladogram below follows the topology from a 2010 analysis by Patrick S. Druckenmiller and Erin E. Maxwell.
Paleobiology.
"P. australis" has been found with remains of sea turtles and birds ("Nanantius") in its guts. Several species attributed to this genus do indeed appear to be apex predators, specialized to hunting proportionally large prey.
Distribution.
Fossils of "Platypterygius" are known from: