Table 2 Amphistegina mammilla: statistical parameters for the ratio diameter/thickness (d/t) of the tests

2.68

0.43

1.53

4.20

2.63

0.47

1.36

3.83

2.74

0.52

1.23

4.45

3.04

0.45

1.89

4.28

2.88

0.37

1.97

4.58

2.98

0.44

1.72

4.38

2.79

0.46

1.40

4.32

3.09

0.72

1.59

5.83

2.89

0.43

1.93

4.31

2.93

0.42

1.80

4.64

 2.69

0.39

 1.65

3.80