Solisphaeridium |
Solisphaeridium folliculum
|
Czechoslovakia(Bohemia) |
Late Arenigian |
|
Stelliferidium |
Stelliferidium
|
Nd |
Nd |
|
Striatotheca |
Striatotheca principalis
|
Czechoslovakia(Bohemia) |
Late Arenigian |
|
Sylvanidium |
Sylvanidium
|
Nd |
Nd |
|
Synsphaeridium |
Synsphaeridium
|
Michigan |
Late Proterozoic |
|
Tasmanites |
Tasmanites
|
Nd |
Nd |
|
Triangulina |
Triangulina sp
|
Nd |
Nd |
|
Tunisphaeridium |
Tunisphaeridium
|
Canada(Nova Scotia) |
Llandoverian |
|
Tylotopalla |
Tylotopalla
|
Nd |
Nd |
|
Tylotopalla |
Tylotopalla caelamenicutis
|
Sweden(Gotland) |
Early Silurian |
|
Tylotopalla |
Tylotopalla robustispinosa
|
Sweden(Gotland) |
Silurian |
|
Umbellasphaeridium |
Umbellasphaeridium
|
Nd |
Nd |
|
Umbellasphaeridium |
Umbellasphaeridium saharicum
|
Nd |
Nd |
|
Vavrdovella |
Vavrdovella areniga
|
Czechoslovakia(Bohemia) |
Arenigian |
|
Velatasphaera |
Velatasphaera hudsonii
|
Nd |
Nd |
|
Veryhachium |
Veryhachium
|
Nd |
Nd |
|
Veryhachium |
Veryhachium irregulare
|
Nd |
Nd |
|