Keywords: FMIB 51690 Polychizaodu radicans Agassiz Family Petaloldontidae Carboniferous of Ireland.jpeg Polychizaodu radicans Agassiz Family Petaloldontidae Carboniferous of Ireland Subject Chondorichthyes Tag Fish 1907 Cite book Fishes Jordan David Starr New York City NY Henry Holt and Company 1907 Fig 153 Creator David Starr Jordan PD-UWASH-FMIB Institution University of Washington FMIB-source accession number 51690 Images from the Freshwater and Marine Image Bank to check David Starr Jordan Shark teeth Petalodontiformes |