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Table 1 Developmental periods for intracapsular development in Ocenebra erinaceus from the south coast of England (50°39′N, 001°37′W) at 15 °C

From: Intracapsular development and dispersal polymorphism in the predatory gastropod Ocenebra erinaceus (Linnaeus 1758)

Ontogenetic stage Mean time in days spent at each stage (individual) Time at developmental stage in days (whole egg mass) Mean size (µm ± SE) Mean number per capsule (±SE) n n (Capsules)
Fertilized egg 16 0–18 587 (±3) 48.2 (±2.14) 2170 45
Trochophore 4 16–23 717 (±4) 43.8 (±2.82) 482 11
Early veliger 8 19–32 754 (±5) 41.4 (±5.15) 455 11
Veliger 12 27–48 784 (±5) 44.3 (±2.89) 1063 24
Pediveliger 12 41–56 800 (±5) 44.2 (±2.57) 795 18
Late pediveliger/pre-hatching juvenile 12 50–69 849 (±5) 45.9 (±1.49) 1698 37
(850 ± 6)a   (1003a)  
(847 ± 6)b   (695b)  
Hatching: swimming late-pediveliger/crawling juvenile n/a 59–69 856 (±7) 44.6 (±1.80) 714 16
(855 ± 8)c (6 ± 4.6)c (345c)  
(856 ± 5)d (38.6 ± 9.3)d (369d)  
  1. Mean size (measured along longest axis) at each ontogenetic stage is displayed (µm). Each measurement was determined from 100 individuals measured from a minimum of 10 capsules. n dictates total number of individuals examined for ontogenetic stage. n (capsules) dictates number of capsules that were examined at each stage and that individuals were measured from. Where n/a is stated, value was inapplicable
  2. aLate pediveliger
  3. bPre-hatching juvenile
  4. cSwimming late-pediveliger
  5. dCrawling juvenile