Abstract
The Chondrichthyes are common aquatic fauna components since the Paleozoic. However, the Chondrichthyan paleontological register is composite, basically, by the mineralized parts, like teeth, dermal denticles and spines. Articulated or partial skeletons are rare; the Iansan beurleni is a exception. There are many well preserved specimens of this specie collected already, but the only few …