Genus Arcosphaeridium

Species total:
3
Age range:
500 - 436.67 MA (obsolete dating)
IRMNG:
find
Name From To Age range
Arcosphaeridium Ordovician Middle Ashgillian
Arcosphaeridium diversispinosum Late Caradocian Middle Ashgillian
Arcosphaeridium poriferum Middle Ashgillian Middle Ashgillian