Fig. 2 in Lamellorthoceratid cephalopods in the cold waters of southwestern Gondwana: Evidences from the Lower Devonian of Argentina

Fig. 2. Lamellorthoceratid cephalopod Arthrophyllum sp. from the Lower Devonian Talacasto Formation in the Precordillera Basin, Argentina. A. CEGHUNC 27426, general view of the longitudinal section of the specimen (A1), details showing a closer view of the lamellae and siphuncle structure (A2–A5), external view (A6), specimen before cutting in posterior view (A7). Note the lamellar deposits where the septum is removed. B. CEGH-UNC 27427, specimen in lateral view (B1), posterior views with different orientations (B2, B3). C. CEGH-UNC 27428, lateral views of the internal mould with different orientations (C1–C3), internal mould in posterior view (C4), external mould in anterior view, showing the lamellar deposits inside the apicalmost chamber (C5), external mould in lateral view with the same lamellar deposits in the posterior part (C6). Scale bars 5 mm.