It was described in Frey, E., Tischlinger, H., Buchy, M.-C., and Martill, D. M., 2003, New specimens of pterosauria (Reptilia) with soft parts with implications for pterosaurian anatomy and locomotion: In: Evolution and Palaeobiology of Pterosaurs, edited by Buffetaut, E., and Mazin, J.-M., Geological Society Special Publication, n. 217, p. 233-266. A photo can be found here: [link] but some important details can only be seen under ultra violet light.