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TABLE 1. Temporal data and taxonomic parameters of the study. Time units and absolute ages extracted from Gradstein and Ogg (2004). The limits and the duration (∆t) of each interval are shown in million years. N0, number of initial taxa; Nt, number of taxa with record in the subsequent interval; O, number of originated taxa; E, number of extinguished taxa; T, number of total taxa; St, number of singleton taxa; Nr, number of range-through taxa; Ne, number of extinguished taxa by discounting the singletons; Nf, number of originated taxa by discounting the singletons.

 

Temporal setting

Taxonomic counts

Time unit

Abbreviation

Lower
limit

Upper
limit

?t

N0

Nt

O

E

T

St

Nr

Ne

Nf

Late Silurian

US

428.2

416.0

12.2

1

2

2

0

3

0

/

0

2

Early Devonian

LD

416.0

397.5

18.5

2

4

4

2

6

1

1

1

3

Middle Devonian

MD

397.5

385.3

12.2

4

11

8

1

12

0

3

1

8

Late Devonian

UD

385.3

359.2

26.1

11

10

7

8

18

4

7

4

3

Mississippian

LCa

359.2

318.1

41.1

10

21

21

10

31

6

6

4

15

Pennsylvnian

UCa

318.1

299.0

19.1

21

27

25

19

46

10

12

9

15

Early Permian

LPe

299.0

270.6

28.4

27

20

7

14

34

2

15

12

5

Late Permian

UPe

270.6

251.0

19.6

20

10

7

17

27

3

6

14

4

Early Triassic

LT

251.0

245.0

6.0

10

13

5

2

15

2

10

0

3

Middle Triassic

MT

245.0

228.0

17.0

13

13

0

0

13

0

13

0

0

Late Triassic

UT

228.0

199.6

28.4

13

25

15

3

28

1

11

2

14

Early Jurassic

LJ

199.6

175.6

24.0

25

28

3

0

28

0

25

0

3

Middle Jurassic

MJ

175.6

161.2

14.4

28

31

4

1

32

0

27

1

4

Late Jurassic

UJ

161.2

145.5

15.7

31

31

2

2

33

0

29

2

2

Early Cretaceous

LCr

145.5

99.6

45.9

31

33

6

4

37

0

27

4

6

Late Cretaceous

UCr

99.6

65.5

34.1

33

58

32

7

65

1

27

6

31

Early Palaeogene

LPa

65.5

55.8

9.7

58

77

19

0

77

0

58

0

19

Middle Palaeogene

MPa

55.8

33.9

21.9

77

140

63

0

140

0

77

0

63

Late Palaeogene

UPa

33.9

23.0

10.9

140

158

18

0

158

0

140

0

18

Early Neogene

LN

23.0

5.3

17.7

158

183

25

0

183

0

158

0

25

Late Neogene

UN

5.3

0.0

5.3

183

183

3

0

186

0

/

0

3

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