Baltisphaeridium |
Baltisphaeridium birminghamense
|
Alabama |
Tarannon |
|
Hoegklintia |
Hoegklintia birminghamense
|
Alabama |
Tarannon |
|
Visbysphaera |
Visbysphaera brevifurcata
|
Baltic |
Late Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium brevifurcatum
|
Baltic |
Late Llandoverian |
|
Dilatisphaera |
Dilatisphaera williereae
|
Belgium |
Llandoverian |
|
Hystrichosphaeridium |
Hystrichosphaeridium williereae
|
Belgium |
Llandoverian |
|
Naevisphaeridium |
Naevisphaeridium sprucegrovense
|
Canada(Alberta) |
Late Devonian |
|
Multiplicisphaeridium |
Multiplicisphaeridium sprucegrovense
|
Canada(Alberta) |
Late Devonian |
|
Polygonium |
Polygonium
|
Czechoslovakia |
Arenigian |
|
Visbysphaera |
Visbysphaera
|
England(Shropshire) |
Wenlockian |
|
Pterospermopsis |
Pterospermopsis martinii
|
Nd |
Nd |
|
Pterospermella |
Pterospermella martinii
|
Nd |
Nd |
|
Leiosphaeridia |
Leiosphaeridia wenlockia
|
Nd |
Nd |
|
Cymatiosphaera |
Cymatiosphaera subrotunda
|
Nd |
Nd |
|
Pterospermopsis |
Pterospermopsis foveolata
|
Nd |
Nd |
|
Pterospermella |
Pterospermella reticulata
|
Nd |
Nd |
|
Duvernaysphaera |
Duvernaysphaera polyfulcracea
|
Nd |
Nd |
|