Ptychoceratodus

Ptychoceratodus is an extinct genus of prehistoric sarcopterygians or lobe-finned fish originally named as a species of "Ceratodus" in 1837. It was a lungfish from the Mesozoic era (Triassic-Cretaceous), and the only members of the family Ptychoceratodontidae. One species, "P. oldhami", was named in 2018 (final version published in 2020) based on remains from the Carnian-aged Tiki Formation (India). The first named species, which is also the type species, is "P. phillipsi", which was named in 1837 by Louis Agassiz as a species of "Ceratodus" and moved to a separate genus in 1926. 
Fossil distribution.
Fossils of "Ptychoceratodus" have been found in: