Fig. 7. A in Non-destructive analysis of pathological belemnite rostra by micro-CT techniques

Fig. 7. A. Rostrum of belemnite Gonioteuthis sp., SNSB-BSPG-83370, Campanian, Höver (NW-Germany) with forma aegra hamata (coll. H. Keupp, leg. C. Spaeth). Surface images showing the knee-like strongly bent and irregular morphology of the rostrum (A1–A4). Median section showing the irregular internal silification of the rostrum indicating poorly mineralized areas, growth and apical line partially visible (A5). Volume rendering image with the darkest areas represented by the thickest or densest areas (A6). B. Rostrum of belemnite Pseudobelus sp., RUB-Pal 3196, Valanginian, Barret-Meouge (France) with forma aegra hamata (coll. M.-C. Picollier). Surface images showing the strongly bent and irregular morphology of the rostrum with the apex growth in anterior direction (B3–B6). Median section overview and close up showing growth increments and the presence of pyrite along the apical line (white) (B1, B7, B8). Cross section showing four growth center representing a temporal sequence (B2).