Protospinax sp. 1

Kriwet, Jürgen, 2003, Neoselachian remains (Chondrichthyes, Elasmobranchii) from the Middle Jurassic of SW Germany and NW Poland, Acta Palaeontologica Polonica 48 (4), pp. 583-594 : 591

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.

Figures

Fig. 3. A. Paratype of Folipistrix digitulus gen. et sp. nov. SMNS 87862, Weilen unter den Rinnen, SW Germany, Dogger α, lower Aalenian; in labial view, × 52. B–C. Orectolobiformes, fam. gen. et sp. indet. Weilen unter den Rinnen, SW Germany, Dogger α, lower Aalenian. B. Specimen SMNS 87863; in labial view, × 85. C. Specimen SMNS 87864; in labial view, × 115. D. Holotype of Synechodus prorogatus sp. nov. BGRX 12503, Kłęby 1/37: 244.8–245.7 m, Callovian; in labial (D1), occlusal (D2), lateral (D3), and lingual (D4) views. All × 40. E. Isolated lateral cusplet of Synechodus prorogatus sp. nov., BGR X 12504, Kłęby 1/37: 244.8–245.7 m, Callovian; in labial (E1) and lingual (E2) views. Both × 30. F. Protospinax cf. annectans Woodward, 1919. Specimen BGRX 12505, Kłęby 1/37: 244.8–245.7 m, Callovian; in labial (F 1), lateral (F2), occlusal (F3), and lingual (F4) views. All × 65. G. Protospinax cf. annectans Woodward, 1919. Specimen BGRX 12506, Kłęby 1/37: 244.8–245.7 m, Callovian; in labial (G 1), lateral (G2), occlusal (G3), and lingual (G4) views. All × 32. H. Protospinax sp. 1. BGRX 12507, Kłęby: 244.8–245.7 m, Callovian; in labial (H 1), lateral (H2), occlusal (H3), and lingual (H4) views. All × 40. J. Protospinax sp. 2. BGRX 12508, Kłęby 1/37: 244.8–245.7 m, Callovian. Labial view. K. Squalogaleus sp. BGRX 12509, Kłęby 1/37: 244.8–245.7 m, Callovian; in labial (K1), lateral (K2), occlusal (K3), and lingual (K4) views. All × 50. L. Synechodus prorogatus sp. nov.? BGRX 12510, Kłęby 1/37: 253.6–~265 m, Callovian. Labial view, × 28. M. Scyliorhinidae indet. BGRX 12511, Kłęby 1/37: 253.6–~265, Callovian; in labial view, × 14. N. Neoselachii indet. BGR X 12512, Kłęby 1/37: 253.6–~265, Callovian; in labial view, × 22.