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Table 1 Estimates of species' lifespan from origination to extinction

From: Q&A: Extinctions and the impact of Homo sapiens

Taxon Species' average lifespan (my)
All invertebrates 11
Marine invertebrates 5-10
Marine animals 4
Marine animals 5
All fossil groups 0.5-5
Mammals 1
Cenozoic mammals 1-2
Diatoms 8
Dinoflagellates 13
Planktonic foraminifera 7
Cenozoic bivalves 10
Echinoderms 6
Silurian graphtolites 2