Fig. 3 in First record of a Late Jurassic rhamphorhynchine pterosaur from Gondwana

Fig. 3. Rhamphorhynchinae gen. et sp. indet. (MUHNCAL.20165) from Cerritos Bayos, west Calama, Chile; Cerro Campamento Formation, middle Oxfordian. Left humerus in dorsal (A1, A5), posterodorsal (A2, A6), posterior (A3, A7), and ventral (A4, A8) views, photographs (A1–A4) and explanatory drawings (A5–A8). Zone of Subvinialesphinctes prophetae and Euaspidoceras centrum. However, we cannot assure that this ratio is natusp., middle Oxfordian. ral since the vertebral centrum is not complete. Only one in- Descriptions.—Vertebra: Among the remains there is a sin- complete transverse process is preserved (preserved length gle incomplete vertebra (Fig. 2). This is visible in articular of ~4.5 mm). This arises from the top of the neural arch and view and it is very eroded; it is difficult to stablish whether has a dorsolateral orientation. Proximally, the height of the it is exposed in anterior, posterior, or in an approximately transverse process represents almost half of the centrum oblique view. The neural spine is tall (preserved height is height, narrowing distally. Due to its incompleteness, its 6.3 mm), as described for Rhamphorhynchinae (Witton extension cannot be established. The neural canal is broad, 2013: 129) especially in the cervical vertebrae, although rel- being wider than high and representing ca. three fifths of atively tall and rectancular neural spines are also seen in the the preserved centrum width. The poor preservation of the anterior dorsal vertebrae of Rhamphorhynchus (see Bonde material makes it difficult to assess the exact shape and and Christiansen 2003: fig. 5). The neural spine is laterally proportions of the neural canal, although it appears to have compressed and slightly higher than the preserved vertebral a dorsoventrally compressed oval shape. The centrum is