Genus Hystrichosphaeridium

Species total:
513
Age range:
4100 - 0 MA (obsolete dating)
IRMNG:
find
Name From To Age range
Hystrichosphaeridium xipheum Oligocene Oligocene
Hystrichosphaeridium zoharyi Aptian Oligocene
Hystrichosphaeridium zonale Early Ordovician Early Ordovician