Fig. 3. A in Non-destructive analysis of pathological belemnite rostra by micro-CT techniques

Fig. 3. A. Rostrum of belemnite Neoclavibelus subclavatus (Voltz, 1830), SNSB-BSPG-83264, Toarcian, Mistelgau (SW-Germany) with forma aegra bullata (coll. H. Keupp). Surface images showing the bump-shaped irregular rostrum growth (A1–A4); longitudinal sections showing presence of sediment (diffuse grey) and pyrite (white) within the rostrum, and increasing irregular growth increments (A5, A6). B. Rostrum of belemnite Belemnitella sp., RE 551.763.333 A 5238, Late Cretaceous, NW-Germany with forma aegra bullata (coll. Baschin). Surface images showing the bump-shaped irregular rostrum growth and imprints of an organic network on the rostrum surface in dorsolateral (B1, B2) and ventrolateral (B3, B4) views; longitudinal sections (B5, B6), and cross section (B7). B5–B7 showing silification (black) along the rostrum surface but also along the malformed area.