| Name | From | To | Age range |
|---|---|---|---|
| Tetrad spore type 1,Saxe.& Rao,1996 | Early Miocene | Early Miocene |
|
| Tetrad tetrahedral | Early Eocene | Middle Eocene |
|
| Tetrad type 1 | Wenlockian | Middle Cenomanian |
|
| Tetrad type 2 | Wenlockian | Gedinnian |
|
| Tetrad type 3 | Late Ordovician | Late Ordovician |
|
| Tetrad type 39 | Early Triassic | Jurassic |
|
| Tetrad type A | Late Ordovician | Late Ordovician |
|
| Tetrad type A Vavr.,1984 | Ashgillian | Ashgillian |
|
| Tetrad type B | Late Telychian | Early Sheinwoodian |
|
| Tetrad type C Vavr.,1984 | Late Ordovician | Late Ordovician |
|
| Tetrad type F | Late Ordovician | Late Ordovician |
|
| Tetrad type xxx | Miocene | Late Neogene |
|
| Tetrad type xxxi | Miocene | Late Neogene |
|