Microconcentrica |
Microconcentrica orbiculata
|
Nd |
Late Riphean |
Early Cambrian |
Microconcentrica |
Microconcentrica parafusiformis
|
Nd |
Nd |
|
Microconcentrica |
Microconcentrica parafusiformis
|
Nd |
Late Proterozoic |
|
Microconcentrica |
Microconcentrica simplex
|
Nd |
Late Proterozoic |
Cambrian |
Microconcentrica |
Microconcentrica subcoalita
|
Nd |
Late Cambrian |
|
Microconcentrica |
Microconcentrica tumidula
|
Nd |
Late Cambrian |
|
Microfasta |
Microfasta
|
Nd |
Nd |
|
Microfasta |
Microfasta evansii
|
Nd |
Neocomian |
Early Aptian |
Microvalia |
Microvalia
|
Nd |
Nd |
|
Microvalia |
Microvalia spinosa
|
Nd |
Nd |
|
Minutissima |
Minutissima
|
Nd |
Nd |
|
Minutissima |
Minutissima atava
|
Nd |
Nd |
|
Minutissima |
Minutissima prima
|
Nd |
Nd |
|
Mirificysta |
Mirificysta
|
Nd |
Nd |
|
Mirificysta |
Mirificysta lineata
|
Nd |
Late Jurassic |
Early Cretaceous |
Mitroporata |
Mitroporata
|
Nd |
Nd |
|
Mitroporata |
Mitroporata armata
|
Nd |
Early Cambrian |
|