Table 2 Eggcase morphometric measurements of the eight rajid species analyzed

D. nidarosiensis

5

Range

153–177

61.8–80.5

38.2–49.7

26.2–40.9

6.5–7.7

6.9–7.8

9–14.6

9–12.4

18.1–25

18.1–35.0

Mean ± SD

170.2 ± 9.8

74.8 ± 7.5

42.6 ± 4.4

34.3 ± 5.4

7.2 ± 0.5

7.3 ± 0.4

10.9 ± 2.1

10.5 ± 1.2

21.2 ± 2.5

23.2 ± 6.7

D. oxyrinchus

37

Range

91.6–116.2

48.9–67.5

20.3–31.7

7.7–20.8

3.2–8

3.2–8

27.1–47.4

27.1–47.4

26.1–40.4

26.1–40.4

Mean ± SD

103.8 ± 5.3

57.0 ± 4.0

26.0 ± 2.5

14.9 ± 3.0

5.4 ± 1.1

5.4 ± 1.1

35.0 ± 6.1

35.0 ± 6.1

32.5 ± 5.1

32.5 ± 5.1

L. melitensis

6

Range

42.3–45

22.4–26

5.6–6.4

0.4–1.3

–

–

42.5–52.5

38.9–52.0

16.5–20.8

13.1–20.2

Mean ± SD

44.1 ± 1.0

23.8 ± 1.4

6.0 ± 0.4

0.7 ± 0.4

–

–

47.0 ± 4.0

44.7 ± 4.8

18.2 ± 1.9

16.6 ± 2.6

R. asterias

59

Range

39.7–55.4

22.4–40.5

4.5–8.9

1–3.8

1.5–4.3

1.5–4.3

18.8–30.5

18.8–30.5

12.1–27.3

12.1–27.3

Mean ± SD

48.3 ± 3.0

33.7 ± 2.6

6.9 ± 1.0

2.1 ± 0.7

2.4 ± 0.7

2.4 ± 0.7

24 ± 3.3

24 ± 3.3

22.3 ± 3.1

22.3 ± 3.1

R. brachyura

12

Range

113–133

64.7–72.2

18.5–25.7

17.5–26.6

3.5–7.4

3.5–7.4

55.6–80.7

55.2–80.7

30.4–59.2

30.4–59.2

Mean ± SD

119.3 ± 4.9

69.5 ± 2.3

21.9 ± 2.5

21.7 ± 2.6

5.5 ± 1.4

5.7 ± 1.4

69.7 ± 10.0

69.5 ± 10.3

43.7 ± 11.0

44. ± 10.7

R. clavata

10

Range

62.5–67.5

41.7–47.4

9.5–15.9

6–8.4

3.1–4.8

3.1–4.8

25–40.6

25–40.6

19.2–24.5

19.2–24.5

Mean ± SD

64.1 ± 1.9

43.8 ± 2.0

11.4 ± 1.8

6.8 ± 0.9

3.8 ± 0.6

3.8 ± 0.6

32.5 ± 5.0

32.5 ± 5.0

22.7 ± 1.6

22.7 ± 1.6

R. miraletus

34

Range

41.8–56.5

22.8–29.2

3–9.9

1.3–4.2

–

–

8.8–27.9

8.8–27.9

10.2–21.7

10.2–21.7

Mean ± SD

47.4 ± 4.0

24.7 ± 1.7

7.2 ± 1.7

2.7 ± 0.8

18.1 ± 4.7

18.1 ± 4.7

16.3 ± 3.3

16.3 ± 3.3

R. polystigma

14

Range

56.6–69.2

33.9–44.3

4.7–13.4

1–2.8

0.8–2.7

0.8–2.3

18.9–36.0

18.4–35.2

12–26.5

12–26.6

Mean ± SD

62.3 ± 4.3

37.9 ± 2.9

9.4 ± 2.4

2.0 ± 0.6

1.7 ± 0.6

1.6 ± 0.5

27.5 ± 5.2

27.3 ± 5.1

22.4 ± 4.8

22.3 ± 4.8