Tytthodiscus |
Tytthodiscus suevicus
|
Nd |
Late Liassic |
|
Tytthodiscus |
Tytthodiscus suevicus
|
Nd |
Early Jurassic |
|
Tytthodiscus |
Tytthodiscus suevicus
|
Nd |
Late Liassic |
|
Tytthodiscus |
Tytthodiscus vanderhammenii
|
Nd |
Late Eocene |
Oligocene |
Ulanisphaeridium |
Ulanisphaeridium
|
Nd |
Nd |
|
Ulanisphaeridium |
Ulanisphaeridium berryense
|
Nd |
Late Permian |
|
Umbellasphaeridium |
Umbellasphaeridium
|
Nd |
Nd |
|
Umbellasphaeridium |
Umbellasphaeridium deflandrei
|
Nd |
Emsian |
|
Umbellasphaeridium |
Umbellasphaeridium huecospinosum
|
Nd |
Emsian |
|
Umbellasphaeridium |
Umbellasphaeridium saharicum
|
Nd |
Famennian |
|
Uncinisphaera |
Uncinisphaera
|
Nd |
Nd |
|
Uncinisphaera |
Uncinisphaera acantha
|
Nd |
Givetian |
|
Uncinisphaera |
Uncinisphaera imaguncula
|
Nd |
Frasnian |
|
Uncinisphaera |
Uncinisphaera lappa
|
Nd |
Late Devonian |
|
Uncinisphaera |
Uncinisphaera obsoleta
|
Nd |
Frasnian |
|
Uncinisphaera |
Uncinisphaera protea
|
Nd |
Arenigian |
|
Uncinisphaera |
Uncinisphaera tribulosa
|
Nd |
Gedinnian |
|