| Name | From | To | Age range |
|---|---|---|---|
| Tetrad | Late Precambrian | Oligocene |
|
| Tetrad forma 12 | Albian | Turonian |
|
| Tetrad planar | Late Cretaceous | Middle Paleocene |
|
| Tetrad small | Paleocene | Early Eocene |
|
| Tetrad sp | Proterozoic | Hauterivian |
|
| Tetrad sp. Stee.et al,2000 | Nd | Nd |
|
| Tetrad sp. Vavr.,1984 | Late Ordovician | Late Ordovician |
|
| Tetrad sp.1 | Emsian | Emsian |
|
| Tetrad sp.1 Rubi.& Stee.,2002 | Late Ludlovian | Early Pridolian |
|
| Tetrad sp.2 | Emsian | Emsian |
|
| Tetrad sp.3 | Emsian | Emsian |
|
| Tetrad sp.3350 Magl.,1967 | Middle Llandoverian | Lochkovian |
|
| Tetrad sp.A Manu.et al,1989 | Miocene | Miocene |
|
| Tetrad sp.B | Wenlockian | Gedinnian |
|
| Tetrad sp.B Manu.et al,1989 | Miocene | Miocene |
|
| Tetrad sp.C | Wenlockian | Gedinnian |
|
| Tetrad sp.D | Pridolian | Gedinnian |
|