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Table 1 Developmental periods for intracapsular development in B. undatum from the south coast of England at 6 °C

From: Nurse egg consumption and intracapsular development in the common whelk Buccinum undatum (Linnaeus 1758)

Ontogenetic stage Mean time in days spent at each stage (individual) Time at developmental stage in days (whole egg mass) Mean size (mm ± SD) Mean size variation within one capsule (mm)a n n (capsules)
Egg 49 0–56 0.23 (±0.01) 0.04 3,235 142
Trochophore 2 42–56 0.32 (±0.02) 0.01 19 12
Early veliger 5 42–56 1.46 (±0.15) 0.33 121 15
Veliger 18 42–77 1.65 (±0.17) 0.27 97 17
Pediveliger 18 70–98 1.91 (±0.32) 0.42 144 20
Pre-hatching juvenile 44 91–140 2.15 (±0.29) 0.38 74 14
Hatching juvenile n/a 133–140 2.43 (±0.39) n/a 102 n/a
  1. Mean size at each ontogenetic stage is displayed (mm). Means are determined as an average of n measurements; n dictates total number of individuals measured. n (capsules) dictates number of capsules individuals were measured from and that were examined at each stage. Where n/a is stated, value was inapplicable or not determined
  2. aOnly capsules with 2 or more individuals included