Fig. 6 in Triassic coleoid beaks and other structures from the Calcareous Alps revisited

Fig. 6. Hypothesized "beak" of the coleoid cephalopod Phragmoteuthis bisinuata (Bronn, 1859) (GBW 2006/011/0009), lower Carnian, Upper Triassic, Cave del Predil, NE Italy. SEM/EDS data on ultrastructure and geochemical composition of the hypothesized "beak". A1, a fracture of the "beak" showing a black structureless matrix containing whitish bone-like nanostructures; A2. high peak of C and lower peaks of S, Ca, and Ba, indicative a carbonized matrix (dark grey areas in A1); A3, high peak of Ca, indicative a calcified material of nanostructures (whitish areas in A1).