Squamation and scale microstructure evolution in the Porolepiformes (Sarcopterygii, Dipnomorpha) based onHeimenia ensisfrom the Devonian of Spitsbergen

Squamation and scale microstructure evolution in the Porolepiformes (Sarcopterygii, Dipnomorpha) based onHeimenia ensisfrom the Devonian of Spitsbergen