Ptychoceratodus sp. cf medelungi Middle Triassic, Lower Muschelkalk (anisian), Upper Silesia, Poland An extremely rare specimen from the Lower Muschelkalk. A dental plate of a lungfish (Dipnoi). Ptychoceratodus is an extinct genus of lungfish that occurred from the Early Triassic to the Middle Jurassic. The fossil record usualy preserves dental plates (the fish had two…