A new species of Lonchidiidae (Hybodontiformes) from the Late Jurassic of Brazil (Aliança Formation, Jatobá Basin)

The Aliança Formation (Jatobá Basin) represents lacustrine deposits formed in oxygenated waters that hosted a diverse fauna, including Hybodontiform sharks. Within this group, the Family Lonchidiidae comprises 11 valid genera, with Parvodus previously reported in Brazilian deposits from the Brejo Santo Formation (Araripe Basin, Late Jurassic) and the Aliança Formation (Jatobá Basin, Late Jurassic). Here, we describe a new species of Parvodus based on isolated teeth from the Aliança Formation. A taxonomic reassessment of the genus is also presented, integrating its stratigraphic and geographic distribution. The new species provides novel insights into the evolutionary history of Lonchidiidae, with implications for the paleobiogeography of the group and the paleoenvironmental interpretation of the Aliança Formation. Importantly, this record expands the known distribution of Parvodus into the Upper Jurassic of South America.