Table 2 Body size and species number values from Orme et al. [43] for each comparison pair. Comparisons 1 to 25 are the default set used for most genes (see Figure 1). Comparisons 26 to 29 are additional pairs used when sequence was unavailable for one or more of the default set.

1

Acoela

Orthonectida

2.10E-02

1.30E-04

319

20

2

Turbellaria

Trematoda

1.32E+01

1.25E-01

15000

20000

3

Cestoda

Monogenea

1.12E+01

8.20E-02

10000

10000

4

Urochordata

Cephalochordata

4.50E+03

2.31E+02

1990

25

5

Chondrichthyes

Petromyzontidae

5.30E+07

9.84E+05

848

84

6

Serpentes

Lepidosauria

1.13E+05

5.50E+03

2500

3000

7

Echinoidea

Holothuroidea

1.93E+05

1.64E+04

950

1150

8

Asteroidea

Ophiuroidea

1.72E+05

6.28E+03

1500

2000

9

Enteropneusta

Pterobranchia

1.56E+03

6.60E+00

70

25

10

Priapulida

Kinorhyncha

6.35E+03

1.10E-03

17

150

11

Nematomorpha

Nematoda

8.33E+01

2.50E-03

304

20000

12

Onychophora

Tardigrada

8.51E+02

2.60E-03

70

600

13

Araneae

Acari

8.82E+01

2.01E+01

37000

45000

14

Orthoptera

Hemiptera

4.80E+02

4.25E+01

20000

98000

15

Hymenoptera

Coleoptera

5.00E+01

4.43E+01

120000

350000

16

Lepidoptera

Diptera

1.62E+02

9.40E+00

160000

120000

17

Copepoda

Ostracoda

6.90E-02

1.60E-02

9000

8000

18

Eucarida

Peracarida

1.69E+04

3.20E+01

10566

12706

19

Brachiopoda

Phoroniformea

5.18E+03

5.80E+02

335

12

20

Acanthocephala

Rotifera

8.40E+00

3.20E-03

900

1800

21

Aplacophora

Caudofoveata

1.56E+02

5.47E+01

180

70

22

Bivalvia

Polyplacophora

2.72E+03

8.58E+02

20000

550

23

Cephalopoda

Scaphopoda

7.33E+04

4.86E+00

656

350

24

Opisthobranchia

Pulmonata

2.21E+02

9.03E+01

1000

20000

25

Polychaeta

Oligochaeta

4.80E+02

1.86E+01

12000

6000

26

Petromyzontidae

Urochordata

9.84E+05

4.50E+03

84

1990

27

Echinoidea

Asteroidea

1.93E+05

1.72E+05

950

1500

28

Priapulida

Nematoda

6.35E+03

2.50E-03

17

20000

29

Cestoda

Trematoda

1.12E+01

1.25E-01

10000

20000