What the rest of Ozarcus probably looks like, based on its new sister, Palaeobates
Another short one today
as interesting hypothetical interrelationships keep accumulating in the LRT. Two late survivors of an Early Silurian radiation, Ozarcus and Palaeobatehttp://reptileevolution.com/ozarcus.htms (Fig 1), are both updated here as the learning process continues.
Note the retention of placoderm post-cranial traits in Palaeobates (Fig 1), which otherwise has an eel-like morphology (long body, reduced lateral fins). It provides the current best clue to the unpreseved post-cranial morphology of Ozarcus.
Ozarcus mapesae
(Pradel et al. 2019; Early Carboniferous, 325 mya; AMNH FF20544, Fig 1) nests with shark-like, eel-like Palaeobates (Fig 1_. In the LRT both are derived from the much smaller and much earlier (Early Silurian) basal osteichthyan and derived placoderm, Shenacanthus. The Ozarcus teeth are extremely tiny, much smaller than each tooth basin in the already ribbon-like maxilla. The premaxilla is a tiny toothless area below the ventral nares. The narrowness of the skull is odd, perhaps unique, or unique to this clade.
Palaeobates angustissimus
(Meyer 1849; Early Triassic, NMC 9980, originally Strophodus angustissimus Agassiz 1834, size?) is an eel-like basal osteichthyan nesting with Ozarcus. The large anal fin and caudal fin mark this late survivor of an Early Silurian radiation as an able swimmer. Ancestors include tiny Shenacanthus. These taxa left on extant relatives.
References
Agassiz L 1843. Recherches Sur Les Poissons Fossiles. Tome I (livr. 18). Imprimerie de Petitpierre, Neuchatel xxxii-188.
Meyer H v 1849. Fische, Crustaceen, Echinodermen und andere Versteinerungen aus dem Muschelkalk Oberschlesiens. Palaeontographica, 1: 216-242.
Pradel A, Maisey JG, Tafforeau P, Mapes RH and Mallant J 2014. A Palaeozoic shark with osteichthyan-like branchial arches. Nature 13185. doi:10.1038/nature13195e
Zhu Y-A et al (10 co-authors) 2022. The oldest complete jawed vertebrates from the early Silurian of China. Nature 609:954–958. online
Source: https://pterosaurheresies.wordpress.com/2023/09/06/what-the-rest-of-ozarcus-probably-looks-like-based-on-its-new-sister-palaeobates/
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