Tepexichthys aranguthyorum, Applegate, 1992

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, Cybium 45 (3), pp. 193-203 : 197

Tepexichthys aranguthyorum ( Fig. 8 A-C)

The fin rays are constituted of cellular bone with numerous osteoblastic canalicles that are orthogonal to the bone surface ( Fig. 8A, B ). The osteocytic lacunae are star-shaped with thin cell processes ( Fig. 8C ). The osteoblastic canalicles are frequently ramified ( Fig. 8B,C ) and they end in the bony tissue with thin ramified processes ( Fig. 8C ).

Figures

Figure 8. – Tepexeichthys aranguthyorum. (IGM 12717b) A: Longitudinal section of a fin ray showing two opposite lepidotrichial hemisegments separated by gang material (black asterisks). Bony tissue is crossed by numerous osteoblastic canalicles orthogonal to the surface of the ray. B: Cross section of a fin ray showing numer- ous osteoblastic canalicles some of which being ramified (black arrows). C: Detail showing the ramified extremity of several oste- oblastic canalicles (black arrows) and several osteocytes (black arrow-heads). Scale bars:A, B = 100 μm; C = 50 μm.