Helodus
ver. 2.1
| Order Helodontiformes PATTERSON, 1965 |
| Family Helodontidae PATTERSON, 1965 |
| Genus Helodus AGASSIZ 1838 |
| Helodus sp.: a; Middle Mississippian, Harrodsburg Limestone Fm., Washington County, b; Middle Mississippian, Salem/Harrodsburg Limestone, Hardin County, Kentucky c; Upper Mississipian, Haney Formation, Crawford County, Indiana |
| 8 mm W, 6.5 mm W, 4.5 mm W |
Lophodus
ver. 2.1
| Cochliodontidae incertae sedis |
| Genus Lophodus ROMANOVSKY 1864 |
| Lophodus irregularis: Serpuchovian, Upper Mississippian Serpuchov Formation, Moscow Region |
| 4.5 mm W |
Solenodus
ver. 2.1
| Cochliodontidae incertae sedis |
| Genus Solenodus TRAUTSCHOLD 1874 |
| Solenodus sp.: Moscovian, Achkasovo, Kasimov Formation, Moscow region |
| 4 mm W |
Venustodus
ver. 2.1
| Cochliodontidae incertae sedis....... |
| GenusVenustodus ST. JOHN et WORTHEN 1875 |
| Venustodus sp.: a-c; Upper Mississipian, Haney Formation, Crawford County, Indiana, d-e; Middle Mississippian, Harrodsburg Limestone Fm., Washington County f; Middle Mississippian, Muldraugh Fm., Hardin County, Kentucky, g; Upper Mississippian, Indian Springs Fm., Crawford County, Indiana |
| ver. 2.0 20071012 |
20120701 Fumio Nakagawa