Arnoldia |
Arnoldia antiqua
|
Nd |
Nd |
|
Ascodinium |
Ascodinium acrophorum
|
Nd |
Nd |
|
Ascodinium |
Ascodinium parvum
|
Nd |
Nd |
|
Ascodinium |
Ascodinium serratum
|
Nd |
Nd |
|
Asperatopsophosphaera |
Asperatopsophosphaera
|
Nd |
Nd |
|
Asperatopsophosphaera |
Asperatopsophosphaera
|
Nd |
Nd |
|
Azonomonoletes |
Azonomonoletes aciferus
|
USSR(Baltic) |
Early Ordovician |
|
Azonomonoletes |
Azonomonoletes aculeatus
|
USSR(Baltic) |
Late Ordovician |
|
Azonomonoletes |
Azonomonoletes argutus
|
USSR(Baltic) |
Late Cambrian |
|
Azonomonoletes |
Azonomonoletes brevispinus
|
USSR(Baltic) |
Early Ordovician |
|
Azonomonoletes |
Azonomonoletes communis
|
USSR(Baltic) |
Late Ordovician |
|
Azonomonoletes |
Azonomonoletes curvispinus
|
USSR(Baltic) |
Early Ordovician |
|
Azonomonoletes |
Azonomonoletes dentatus
|
USSR(Baltic) |
Late Ordovician |
|
Azonomonoletes |
Azonomonoletes denticulatus
|
USSR(Baltic) |
Early Ordovician |
|
Azonomonoletes |
Azonomonoletes denudatus
|
Nd |
Nd |
|
Azonomonoletes |
Azonomonoletes echinatus
|
USSR(Baltic) |
Early Ordovician |
|
Azonomonoletes |
Azonomonoletes gibberosus
|
USSR(Baltic) |
Late Cambrian |
|