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Table 1 Normal development of H. trivolvis

From: Mechanisms underlying dual effects of serotonin during development of Helisoma trivolvis(Mollusca)

Stage name

Stage after Meshcheriakov

Stage,%

Size, mm

    

(min - max)

Trochophore

Early

19

20

0.16 – 0.19

 

Middle

20

25

0.20 – 0.24

 

Late

21

30

0.25 – 0.31

Veliger

Early

22

35

0.32 – 0.40

 

Middle

23

45

0.41 – 0.47

 

Late “hippo”

24

55

0.48 – 0.56

Metamorphic

Veliconcha

25

65

0.57 – 0.61

  

26

75

0.62 – 0.66

  

27

85

0.67 – 0.72

Adult-like

 

28

90

0.73 – 0.78

  

29

100

0.74 – 0.79

  1. Interrelations between developmental stages after Mescheriakov [51], timing of embryogenesis in%, and the length of specimens in mm are shown. Five hundred specimens were measured.