Smith A.S., Zaton M. (2007) The first Actinopterigian (Pisces: Osteichthyes) tooth from the Bathonian (Middle Jurassic) of the Polish Jura (south-central Poland) // Freiberger Forschungshefte, C (Palaeontologie, Stratigraphie, Fazies). Bd.15. S.35–40.
A 12 mm long conical tooth crown is described from the Middle Bathonian (subcontractus Zone) deposits of the “Gnaszyn” clay-pit at Gnaszyn Dolny, Poland. The fossil represents the first reported actinopterigian (basal Neopterygii) material from the Middle Jurassic of Poland. The specimen bears a distinctive ornamentation of anatomising ridges and an acrodin cap at the apex indicating a large actinopterygian fish. The tooth morphology and size is typical of a large macrophagous predator.