The Effects on Skeletonized Marine Invertebrates of Selected Extinction Events Including

Table 6.1: The Effects on Skeletonized Marine Invertebrates of the ‘Big Five’ Mass Extinctions (modifieda from p713, Futuyma 1998)

Extinction Event / Age
(x106 years)b / Families (%) / Genera (%) / Species (%)c
End Cretaceous / 65.0 / 16—17 / 47—50 / 76 ± 5
End Triassic / 200.0—220.0 / 22—23 / 48—53 / 80 ± 4
End Permian / 245.0—251.0 / 51—57 / 82—84 / 95 ± 2
Late Devonian / 360.0—370.0 / 19—22 / 50—57 / 83 ± 4
End Ordovician / 435.0—444.0 / 26—27 / 57—60 / 85 ± 3

aModifications come fromAnderson (1999), Lévêque & Mounolou (2001),Broswimmer (2002), Futuyma (2005) and Wikipedia Contributors (2006c).

bTime periods are given for the older mass extinctions because the literature gives variable dates.

cThe species percentages are estimated from statistical analyses of the numbers of species per genus.

The Effects on Skeletonized Marine Invertebrates of Selected Extinction Events including the ‘Big Five’ Mass Extinctionsa (from p713, Futuyma 1998)

Extinction Event / Age
(x106 years) / Families (%) / Genera (%) / Species (%)b
Late Eocene / 35.4 / — / 15 / 35 ± 8
End Cretaceous / 65.0 / 16 / 47 / 76 ± 5
Early Late Cretaceous (Cenomanian) / 90.4 / — / 26 / 53 ± 7
End Jurassic / 145.6 / — / 21 / 45 ± 7.5
Early Jurassic (Pliensbachian) / 187.0 / — / 26 / 53 ± 7
End Triassic / 208.0 / 22 / 53 / 80 ± 4
End Permian / 245.0 / 51 / 82 / 95 ± 2
Late Devonian / 367.0 / 22 / 57 / 83 ± 4
End Ordovician / 439.0 / 26 / 60 / 85 ± 3

a In bold in the table

b The species percentages are estimated from statistical analyses of the numbers of species per genus.