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

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

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		(1003^a)
			(847 ± 6)^b		(695^b)
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	(345^c)
			(856 ± 5)^d	(38.6 ± 9.3)^d	(369^d)

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
^aLate pediveliger
^bPre-hatching juvenile
^cSwimming late-pediveliger
^dCrawling juvenile

ISSN: 1438-3888