Tetrad |
Tetrad sp. Vavr.,1984
sp. nov. |
Nd |
Nd |
|
Tetrad |
Tetrad type C Vavr.,1984
sp. nov. |
Nd |
Nd |
|
Tetrahedraletes |
Tetrahedraletes grayii
sp. nov. |
Illinois |
Ashgillian |
|
Tetrahedraletes |
Tetrahedraletes medinensis
|
Pennsylvania |
Llandoverian |
|
Tetrahedraletes |
Tetrahedraletes sp. Duff.& Lega.,1981
sp. nov. |
Nd |
Nd |
|
Tetrahedraletes |
Tetrahedraletes sp. Rich.,1988
sp. nov. |
Nd |
Nd |
|
Tetraletes |
Tetraletes granulatus
|
Spain |
Ludlovian |
Early Gedinnian |
Tetraletes |
Tetraletes sp
|
Nd |
Nd |
|
Tetraletes |
Tetraletes sp. Mill.& Eame.,1982
sp. nov. |
Nd |
Nd |
|
Tetraletes |
Tetraletes sp. Vavr.,1982
sp. nov. |
Nd |
Nd |
|
Tetraletes |
Tetraletes sp. Vavr.,1982
sp. nov. |
Nd |
Nd |
|
Tetraletes |
Tetraletes variabilis
|
Spain |
Ludlovian |
Early Gedinnian |
Trachydiacrodium |
Trachydiacrodium sp. Stro.& Trav.,1979
sp. nov. |
Nd |
Nd |
|
Vermiculatisphaera |
Vermiculatisphaera obscura
|
New York |
Early Gothlandian |
|