species of Stenopterygius . This species was reassigned to its own genus, Hauffiopteryx .   Stenopterygius is known from the lectotype GPIT  43/0219-1, articulated complete skeleton which preserved a very large embryo. The animal is about 3.15 m (10.3 ft) in length. It was collected from the Harpoceras elegantulum-exaratum ammonoid subzones (more specifically