Fig. 3 in Lower Turonian record of belemnite Praeactinocamax from NW Siberia and its palaeogeographic significance

Fig. 3. The alveolar fracture (alveolar end) reconstruction of Praeactinocamax aff. plenus with the position of phragmocone. A. Morphotype A, specimen MSU 3025−3/1 with low cone−shaped fracture, in ventral (A1) and lateral (A2) views. B. Morphotype B, specimen MSU 3025−3/2 with a very shallow pseudoalveolus with a pit in the centre, in ventral (B1) and lateral (B2) views.