Neoselachian remains (Chondrichthyes, Elasmobranchii) from the Middle Jurassic of SW Germany and NW Poland Author Kriwet, Jürgen text Acta Palaeontologica Polonica 2003 2003-11-30 48 4 583 594 journal article 1732-2421 A40C8EB5-8246-4B2D-9050-267525441F87 Protospinax sp. 1 Fig. 3H . Material .—A single isolated tooth crown, BGRX 12507, Kłęby 1/37: 244.8–245.7 m . Callovian. Remarks . —The specimen differs from the previous in the more robust crown. The cusp is small and blunt. The cutting edge is continuous and rectilinear without any crenulations or serrations. There are no lateral cusplets. The labial face is triangular in labial view and is more or less flat without a concavity of the upper crown face. The basal edge of the labial face is concave. The uvula is rather massive and a hump−like structure is indicated just below the apex on the lingual face. The root is not preserved. The combination of the crown characters indicates its affiliation to Protospinax . It resembles slightly teeth figured by Thies (1983) as P. annectans . However, a specific attribution is not possible.