| Name | From | To | Age range |
|---|---|---|---|
| Tetrad sp. Stee.et al,2000 | Nd | Nd |
|
| Tetrad spore type 1,Saxe.& Rao,1996 | Early Miocene | Early Miocene |
|
| Tetrad type xxx | Miocene | Late Neogene |
|
| Tetrad type xxxi | Miocene | Late Neogene |
|
| Tetrad sp.B Manu.et al,1989 | Miocene | Miocene |
|
| Tetrad sp.A Manu.et al,1989 | Miocene | Miocene |
|
| Tetrad tetrahedral | Early Eocene | Middle Eocene |
|
| Tetrad small | Paleocene | Early Eocene |
|
| Tetrad planar | Late Cretaceous | Middle Paleocene |
|
| Tetrad forma 12 | Albian | Turonian |
|
| Tetrad type 39 | Early Triassic | Jurassic |
|
| Tetrad sp.2 | Emsian | Emsian |
|
| Tetrad sp.3 | Emsian | Emsian |
|
| Tetrad sp.1 | Emsian | Emsian |
|
| Tetrad sp.1 Rubi.& Stee.,2002 | Late Ludlovian | Early Pridolian |
|
| Tetrad sp.D | Pridolian | Gedinnian |
|
| Tetrad type 2 | Wenlockian | Gedinnian |
|