Platinx

Platinx is an extinct genus of marine ray-finned fish that inhabited the northern Tethys Ocean during the early to middle Eocene. It was the last surviving member of the ancient order Crossognathiformes, which was a dominant and successful group throughout the preceding Mesozoic era.
It contains a single species, P. macropterus, whose remains are primarily known from the late Ypresian-aged rocks of Monte Bolca, Italy. However, specimens have also been recovered from the earliest-Ypresian Danata Formation of Turkmenistan, as well as incomplete remains from the middle Eocene of Syria.
The extinct bonytongues Monopteros and Thrissopterus, which co-occur with Platinx in Monte Bolca, were for a time briefly reclassified as a species of Platinx, although they are now known to be distinct.