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Table 4.2: Average species longevities for 1418 Cenozoic marine plankton species contained in Neptune. Longevities and standard deviations are in million years.

Plankton Group

Number of species

Extant species
(in %)

Mean Longevity of Extant Species

Standard Deviation

Mean Longevity of Extinct Species

Standard Deviation

Diatoms

389

26.5

14.4

13.7

10.2

10.3

Foraminifera

281

13.9

13.9

9.2

11.1

7.8

Radiolarians

383

29.8

13.4

9.2

12.9

7.8

Nannofossils

365

8.5

17.8

19.8

13.1

10.6

All groups

1418

20.2

14.3

12.4

11.9

9.4