ammonites
Platypterygius birjukovi Otschev and Efimov 1985 (ichthyosaur)

Reptilia - Ichthyosauria - Ophthalmosauridae

Alternative combination: Simbirskiasaurus birjukovi

Full reference: V. G. Otschev and V. M. Efimov. 1985. Novyy rod ikhtiozavrov iz Ul'yanovskogo Povolzh'ya. Paleontologeskii Zhurnal (4)76-80

Belongs to Platypterygius according to M. W. Maisch 2010

Sister taxa: Platypterygius americanus, Platypterygius australis, Platypterygius bannovkensis, Platypterygius bedengensis, Platypterygius campylodon, Platypterygius compylodon, Platypterygius hauthali, Platypterygius hercynicus, Platypterygius kiprijanoffi, Platypterygius ochevi, Platypterygius platydactylus, Platypterygius sachicarum

Type specimen: SGU 104a/22, a partial skull

Ecology: nektonic carnivore

Average measurements (in mm): partial skull 500.0 x 85.0