Littorina saxatilis | mollusk | Britannica (original) (raw)

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breeding habits

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  In periwinkle
  L. saxatilis, which lives high up on rocks and is often out of water for long periods of time, holds its embryos in a brood sac until the young are fully developed, at which time they emerge as tiny crawling replicas of the adult. L.…
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  In gastropod: Reproduction and life cycles
  …weeks as crawling young; and L. saxatilis, which extends from midtide level to several feet above the high-water mark, retains the eggs inside the female until they hatch as crawling young.
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