Obruchevodid petalodonts (Chondrichthyes, Holocephali) from the Upper Mississippian (Serpukhovian) Bangor Limestone of northern Alabama, U.S.A.

Undocumented collections and new field studies have revealed a diverse chondrichthyan assemblage within the Upper Mississippian (Serpukhovian/middle-upper Chesterian) Bangor Limestone in northern Alabama, U.S.A. which includes multiple new occurrences of holocephalians. Included in these new records are the first occurrences of Obruchevodidae (Euchondrocephalii, Petalodontiformes) outside of the synchronic Bear Gulch Limestone Member of the Heath Formation in Montana, U.S.A. Isolated teeth from <italic>Fissodopsis robustus</italic> and <italic>Netsepoye hawesi</italic> represent the first specimens to provide three-dimensional tooth morphology that is otherwise obscured in the holotypes. Additionally, these specimens represent the first reported occurrences from the southern coast of the subcontinent Laurentia. The significance of these new specimens is discussed in regard to the comparative morphology of Petalodontiformes and the paleobiogeography of Obruchevodidae. [ABSTRACT FROM AUTHOR]