Table 2 Summary of metric characters of Paralia species in this study

# of clones examined

15

41

7

6

3

Character

Valve diameter (μm)

12.2 (3.4);

11.5 (2.9);

15.3 (5.2);

18.6 (4.2);

19.9 (2.5);

5.4-20.2; 199

6.9-22.9; 571

9.0-26.9; 147

9.2-23.8; 109

13.7-24.1; 47

Pervalvar axis (μm)

7.6 (1.1);

7.7 (1.1);

15.3 (5.2);

10.4 (4.4);

7.6 (0.99);

5.5-9.7; 31

4.9-11.3; 132

9.0-26.9; 14

6.4-10.3; 17

6.5-8.5; 5

Valve face

Internal linking spines in 10 μm

5.9 (2.5);

6.4 (3.1);

6.0 (2.9);

7.1 (2.9);

7.0 (3.3);

2.3-11.5; 116

1.2-11.9; 312

2.8-11.7; 83

3.2-12.0; 68

2.2-13.8; 32

Separation valve prickles present

No

No

Mostly

Mostly

Mostly

Valve mantle external

Marginal linking spines in 10 μm

7.7 (0.87);

8.2 (0.92)

7.8 (0.78)

7.7 (0.81)

7.6 (0.67)

5.9-10.0; 42

5.7-10.4; 197

6.5-10.2; 23

6.0-9.9; 38

6.4-8.8; 14

Fenestrae in 10 μm

10.5 (3.4);

8.0 (0.81);

9.9 (3.9);

7.6 (0.6);

7.9 (1.2);

6.0-15.4; 30

5.6-10.3; 191

5.9-18.1; 17

6.4-8.6; 42

6.4-8.9; 4

Cingulum slits in 10 μm

51.6 (6.4);

53.8 (6.7);

41.2 (6.8);

44.7 (4.4);

42.6 (7.8);

38.5-68.7; 108

33.5-76.1; 335

33.1-61.0; 162

36.8-61.0; 103

33.7-66.3; 16

Valve mantle internal

Internal striae in 10 μm

37.4 (4.7);

38.6 (3.3);

38.0 (2.7);

37.7 (2.1);

38.9 (3.3);

31.1-60.0; 54

32.8-64.3; 177

30.3-43.0; 36

33.7-42.7; 40

34.3-45.6; 14

Internal striae pores in 1 μm

3.0 (0.34);

2.8 (0.33);

3.5 (0.41);

2.8 (0.30);

3.05 (0.38);

2.7-3.6; 5

2.3-4.1; 71

3.0-4.0; 8

2.4-3.3; 14

2.8-3.5; 3

Rimoportulae in 10 μm

1.9 (0.53);

2.1 (0.48);

2.5 (0.48);

2.5 (0.47);

2.4 (0.28);

1.1-2.5; 26

0.4-3.6; 87

1.5-3.8; 27

1.5-3.5; 25

1.9-2.9; 11