| Name | From | To | Age range |
|---|---|---|---|
| Scolecodont | Early Paleozoic | Late Miocene |
|
| Scolecodont a | Middle Carboniferous | Early Permian |
|
| Scolecodont b | Middle Carboniferous | Early Permian |
|
| Scolecodont c | Middle Carboniferous | Early Permian |
|
| Scolecodont form a | Middle Devonian | Middle Devonian |
|
| Scolecodont form b | Middle Frasnian | Middle Frasnian |
|
| Scolecodont form c | Middle Frasnian | Middle Frasnian |
|
| Scolecodont form d | Wenlockian | Wenlockian |
|
| Scolecodont form e | Devonian | Devonian |
|
| Scolecodont form f | Silurian | Silurian |
|
| Scolecodont form g | Middle Frasnian | Middle Frasnian |
|
| Scolecodont form h | Middle Frasnian | Middle Frasnian |
|
| Scolecodont form j | Middle Frasnian | Middle Frasnian |
|
| Scolecodont sp | Late Proterozoic | Wolstonian |
|
| Scolecodont sp.1 | Wenlockian | Monongahela |
|
| Scolecodont sp.2 | Wenlockian | Late Frasnian |
|
| Scolecodont sp.210 | Lochkovian | Lochkovian |
|