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Swiss Journal of Palaeontology

Table 2 Measured 2D microwear data

From: Complex dental wear analysis reveals dietary shift in Triassic placodonts (Sauropsida, Sauropterygia)

Species

Ns

Nfeature(µm)

Npit

Nscratch

Pit %

Plength(µm)

Pwidth(µm)

Slength(µm)

Swidth(µm)

Mean

SD

Mean

SD

Mean

SD

Mean

SD

Mean

SD

Mean

SD

Mean

SD

Mean

SD

Placodonts

                 

Cyamodus hildegardis

6

219.92

25.20

167.74

17.66

52.18

9.74

76.38

2.56

21.60

1.80

15.64

1.83

52.05

3.93

4.04

0.80

Cyamodus cfr. rostratus

1

307.00

-

188.75

-

118.25

-

61.48

-

20.95

-

16.31

-

53.03

-

4.99

-

Cyamodus kuhnschnyderi

3

146.67

24.52

129.25

20.69

17.42

3.88

88.23

0.70

26.49

2.67

20.43

2.63

53.35

3.69

4.21

0.53

Cyamodus sp.

12

120.78

19.91

112.26

18.41

8.52

4.67

93.03

3.64

25.13

2.33

20.55

2.71

96.80

48.11

3.27

1.60

Placodus gigas

14

113.89

13.55

103.73

12.58

10.16

5.35

91.18

4.58

27.12

1.67

21.93

1.97

86.22

43.29

3.86

2.11

Psephoderma alpinum

3

250.69

25.10

165.33

7.40

85.36

17.88

66.31

3.70

18.97

1.97

13.93

1.30

82.33

20.78

2.06

0.08

Henodus chelyops

2

402.67

13.67

185.00

14.00

217.67

0.33

45.88

1.92

13.48

0.61

9.82

0.87

73.59

3.97

1.49

0.03

Placochelys placodonta

3

313.44

86.09

173.42

55.83

140.03

31.39

54.76

3.04

19.11

2.18

14.59

2.09

86.97

9.54

1.81

0.12

Paraplacodus broilii

5

270.05

46.49

137.73

15.74

132.32

30.89

51.55

3.37

21.89

1.03

15.49

0.57

84.28

4.97

2.29

0.27

Macroplacus raeticus

1

42.00

-

39.00

-

3.00

-

92.86

-

46.94

-

38.19

-

32.39

-

2.17

-

Extant mammals

                 

Dugong dugon

1

312.33

-

78.67

-

233.67

-

25.19

-

15.39

-

10.85

-

113.14

-

1.51

-

Trichechus manatus

1

306.33

-

118.33

-

188.00

-

38.63

-

12.91

-

8.83

-

118.11

-

1.77

-

Enhydra lutris

3

261.42

7.80

145.67

15.11

115.75

12.97

55.68

5.21

21.19

0.67

15.64

0.75

96.90

7.58

2.85

0.33

  1. Abbreviations: N = number, Ns = number of specimen, P = pit, S = scratch, SD = standard deviation
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