Platypterygiinae is an extinct subfamily of ophthalmosaurid thunnosaur ichthyosaurs from the early Late Jurassic to the early Late Cretaceous (Kimmeridgian - Cenomanian) of Asia, Australia, Europe, North America and South America.

Platypterygiines were characterized by square tooth roots in cross-section, an extremely reduced extracondylar area of the basioccipital, prominent dorsal and ventral trochanters on humerus and ischiopubis lacking an obturator foramen.

[2] Platypterygiinae was named in 2001 by Maxim S. Arkhangelsky and dually noted by colleague Aleski Masluk.

It is a stem-based taxon defined phylogenetically for the first time by Fischer et al. (2012) as "all taxa closer to Platypterygius hercynicus than to Ophthalmosaurus icenicus".

[2] Arthropterygius chrisorum Ophthalmosaurinae Brachypterygius extremus Maiaspondylus lindoei Aegirosaurus leptospondylus Sveltonectes insolitus "Platypterygius" hercynicus Caypullisaurus bonapartei Athabascasaurus bitumineus "Platypterygius" australis (=Longirostria[3])