Figure 2. – Neoproscinetes penalvai. A in The paleohistology of bone and teeth in Cretaceous Pycnodontidae (Neopterygii: Pycnodontiformes): the case of Neoproscinetes penalvai and Tepexichthys aranguthyorum

Figure 2. – Neoproscinetes penalvai. A: External view of the studied fossil material showing some teeth (white and black arrowheads). Lines aa' and bb' correspond to the first sections series of the specimen. B: View of the right side (bloc No 2), showing the vomer (Vo), the two prearticulars (PA). C: Polished surface bb' of sample No 2, showing the relations between teeth (asterisks) and the bony skeleton. One can see two teeth inserted on the vomer (Vo) on the right, and several other ones on the two prearticulars (PA) on the left. On the top a dermal bone (Db) with an odontode (arrow-head). D: Neoproscinetes penalvai. Occlusal view of the lower jaw (left prearticular) showing i) two shed teeth (black arrows), the scars of which show pleats indicating a plicidentine organization, ii) three resorbing teeth (black arrow-heads), and iii) two young growing teeth (white arrow-heads). Upper left inset. Detail of the left shed tooth showing the crenulated dentine in the pulp cavity (arrow). Scale bar = 1 mm. E: Tepexeichthys aranguthyorum. External view of the studied fossil material showing fin rays (on the upper right) and some bony plates (black asterisks). The lines aa' and bb' wrap the area of cross sections. Scale bars: A, B, C, D, E = 5 mm. ; Published as part of Meunier, François J., Alvarado-Ortega, Jesús, Machado, Lúcio P.C. & Brito, Paulo M., 2021, The paleohistology of bone and teeth in Cretaceous Pycnodontidae (Neopterygii: Pycnodontiformes): the case of Neoproscinetes penalvai and Tepexichthys aranguthyorum, pp. 193-203 in Cybium 45 (3) on page 195, DOI:10.26028/cybium/2021-453-003, http://zenodo.org/record/12712544