| Order Squaliformes Goodrich, 1909 |
| Family Squalidae Bonaparte, 1834 |
| Genus Isistius Gill, 1864 |
| Isistius brasiliensis (Quoi & Gaimard 1824): Late Miocene, Hawthorn Group, Big Slough, Sarisota County, Florida |
Isistius
ver. 1.0
Back & Forth
| Order Squaliformes Goodrich, 1909 |
| Family Squalidae Bonaparte, 1834 |
| Genus Isistius Gill, 1864 |
| Isistius brasiliensis (Quoi & Gaimard 1824): Late Miocene, Hawthorn Group, Big Slough, Sarisota County, Florida |
| Isistius triangulus (Probst 1879): Middle Miocene, Godo Formation, Tokigawa G. Kuzubukuro, Higashi-matuyama City, Saitama Prefecture |
| Isistius trituratus (Winkler 1874): Early Eocene, Nanjemoy Formation, Potapaco Menber Fisher-Sullivan Bone bed ( Muddy Creek), Stafford County, Virginia |
Somniosus
| Genus Somniosus Le Sueur, 1818 |
| Somniosus microcephalus (Bloch & Schneider 1801): Lower Pliocene (Zanclean), Kattendijk Formation, Doel village, Belgium |
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