Fig. 3 in Gladius shape variation in coleoid cephalopod Trachyteuthis from the Upper Jurassic Nusplingen and Solnhofen Plattenkalks

Fig. 3. Gladius of vampyropod coleoid Trachyteuthis hastiformis (Rüppell, 1829). A. Holotype (SMF IX1328), Lower Tithonian (Hybonoticeras hybonotum Zone), Mühlheim. A1, lower slab with gladius in dorsal aspect; A2, close−up of A1 showing the granulated area within the spindle−shaped elevation, which is flattened but easily visible in outlines; A3, original drawing of Rüppell (1829: pl. 3: 3). B. Specimen MARKM 1 (original of Meyer (1855: pl. 19: 1), Lower Tithonian (Hybonoticeras hybonotum Zone), Solnhofen area. B1, gladius in ventral aspect; B2, close−up of B1 showing the spindle−shape structure; B3, original drawing of Meyer (1855: pl. 19: 1).