Ozarcus mapesae (Pradel et al. 2019; Early Carboniferous, 325 mya; AMNH FF20544) nests with shark-like, eel-like Palaeobates. In the LRT both are derived from the much smallerand muc earlier (Early Silurian) basal osteichthyan and derived placoderm, Shenacanthus. The teeth are extremely tiny, much smaller than each tooth basin in the already thread-like maxilla. The premaxilla is a tiny toothless area between the incurrent nares. The narrowness of the skull is odd, perhaps unique or unique to this clade. |