Hystrichosphaeridium

Genus Hystrichosphaeridium

Species total:
513

Age range:
4100 - 0 MA (obsolete dating)

IRMNG:
find

Name	From	To
Hystrichosphaeridium simulatum	Middle Clintonian	Middle Clintonian
Hystrichosphaeridium group b	Middle Clintonian	Late Clintonian
Hystrichosphaeridium asymmetricum	Middle Clintonian	Santonian
Hystrichosphaeridium pentaspinosum	Middle Clintonian	Late Clintonian
Hystrichosphaeridium amplum	Middle Clintonian	Late Clintonian
Hystrichosphaeridium calvum	Middle Clintonian	Late Clintonian
Hystrichosphaeridium meson	Late Llandoverian	Late Ludlovian
Hystrichosphaeridium quadrangulatum	Early Clintonian	Early Clintonian
Hystrichosphaeridium group a	Clintonian	Clintonian
Hystrichosphaeridium polytrichum	Tarannon	Oligocene
Hystrichosphaeridium hibbardii	Early Clintonian	Early Clintonian
Hystrichosphaeridium oligospinosum	Silurian	Silurian
Hystrichosphaeridium multispinosum	Silurian	Late Clintonian
Hystrichosphaeridium fluctuans	Silurian	Silurian
Hystrichosphaeridium microspinosum	Silurian	Late Llandoverian
Hystrichosphaeridium piriferum	Silurian	Late Llandoverian
Hystrichosphaeridium staurasteroides	Gothlandian	Late Clintonian