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Echinosphaerites
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Echinosphaerites, from the Ordovician Period
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Echinosphaerites, from the Ordovician Period
Echinosphaerites, from the Ordovician Period

Echinosphaerites

fossil cystoid genus
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Related Topics:
Ordovician Period
Paleozoic Era
fossil
cystoid

Echinosphaerites, genus of cystoids, an extinct group related to the sea lily and starfish, found as fossils in Ordovician marine rocks (between 505 and 438 million years old). It is a useful guide, or index, fossil for Ordovician rocks and time.