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.

Published as part of Hoffmann, René, Stevens, Kevin, Picollier, Marie-Claire, Mutterlose, Jörg & Klug, Christian, 2020, Non-destructive analysis of pathological belemnite rostra by micro-CT techniques, pp. 11-27 in Acta Palaeontologica Polonica 65 (1) on page 15, DOI: 10.4202/app.00689.2019, http://zenodo.org/record/12524750