Prodactylioceras davoei (Sowerby 1822)

11cm. The indices fossil from the davoei Zone, Carixian, lower Pliensbachian, lower Jurassic. Found in a prep box under a table at the recent "Fossilien-Boerse" in Leinfelden near Stuttgart. Originally dug up at Steinbourg, Elsass, France by some friends of mine.