Table 2 Morphometric measurements of Macrostomum crassum, M. pellitum, and M. longispermatum

Body L

921.9

125.3

833.3–1010.5

2

947.1

146.5

760.9–1231.0

14

1187.1

254.5

903.6–1608.9

9

Body W

362.9

21.5

347.7–378.1

2

225.4

43.6

171.1–320.5

14

328.0

128.5

172.1–550.6

8

Eye ø

12.5

2.5

10.7–14.3

2

11.1

1.1

9.1–12.5

7

14.3

1.1

13.3–15.9

6

Testis L

105.2

3.1

103–107.4

2

214.0

51.0

150.7–292.8

12

202.5

30.4

154.3–237.4

5

Ovary L

86.7

1.1

86–87.5

2

63.1

21.5

32.6–105.4

12

110.3

54.6

66.7–179.7

5

Short sensory cilia L

12.8

7.8

7.3–18.3

2

10.7

3.2

8.3–19.7

12

10.9

3.4

7.1–16.9

6

Long sensory cilia L

20.8

4.2

17.9–23.8

2

28.5

3.5

23.8–35.7

13

18.8

4.3

13.4–26.0

7

Rhabdite L

9.3

1.2

8.5–10.1

2

11.0

2.9

8.8–16.7

7

9.4

2.0

7.2–11.1

3

Stylet traits

 Straight L

152.0

2.0

150.6–153.5

2

86.1

5.1

80.7–96.7

9

138.4

4.1

134.3–146.1

7

 Segmented L

156.1

1.9

154.8–157.4

2

79.5

4.8

73.6–88.9

9

152.4

19.3

107.9–172.6

8

 Proximal opening W

17.4

0.9

16.7–18.0

2

12.0

1.3

9.6–13.6

9

11.5

1.4

9.5–13.7

8

 Distal opening W

4.0

0.3

3.8–4.2

2

6.9

1.1

4.4–8.1

9

2.7

0.2

2.4–3.1

8

Sperm traits

 Total L

130.0

–

–

1

147.1

0

147.1–147.1

2

173.1

9.2

166.6–179.6

2

 Anterior L

86.7

–

–

1

102.9

0.4

102.6–103.1

2

115.5

1.4

114.6–116.5

2

 Bristle L

12.7

–

–

1

7.0

3.0

4.0–10.1

3

6.8

1.1

5.5–7.4

3

 Brush L

3.8

–

–

1

4.2

0

4.2–4.2

2

3.7

0.3

3.5–3.9

2