Acanthodiacrodium |
Acanthodiacrodium minimum
|
Algeria |
Tremadocian |
|
Acanthodiacrodium |
Acanthodiacrodium raium
|
Algeria |
Tremadocian |
|
Baltisphaeridium |
Baltisphaeridium duvernayense
|
Canada(Alberta) |
Late Devonian |
|
Baltisphaeridium |
Baltisphaeridium echinodermum
|
Belgium |
Tarannon |
|
Baltisphaeridium |
Baltisphaeridium octospinosum
|
Canada(Alberta) |
Late Devonian |
|
Baltisphaeridium |
Baltisphaeridium sedecimspinosum
|
Argentina(Santiago) |
Late Gothlandian |
|
Comasphaeridium |
Comasphaeridium apodasmios
|
Ohio |
Famennian |
|
Comasphaeridium |
Comasphaeridium arcetotricus
|
Ohio |
Famennian |
|
Comasphaeridium |
Comasphaeridium campoae
|
Belgium |
Tournaisian |
|
Comasphaeridium |
Comasphaeridium duvernayense
|
Canada(Alberta) |
Late Devonian |
|
Comasphaeridium |
Comasphaeridium elongatum
|
Ohio |
Famennian |
|
Comasphaeridium |
Comasphaeridium lasios
|
Ohio |
Famennian |
|
Comasphaeridium |
Comasphaeridium taleum
|
Ohio |
Famennian |
|
Dictyotidium |
Dictyotidium amydrum
|
Indiana |
Late Wenlockian |
|
Dictyotidium |
Dictyotidium reticulatum
|
Baltic |
Ordovician |
|
Ecmelostoiba |
Ecmelostoiba asymmetrica
|
Ohio |
Frasnian |
|
Ecmelostoiba |
Ecmelostoiba asymmetrica
|
Ohio |
Late Devonian |
Early Mississippian |