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Platydemus manokwari is the main predator of land mollusks, and preys upon the snails during most of their life cycle including young hatchlings. [8] Furthermore, P. manokwari does not recognize early-stage snail eggs as a possible food source, but it does feed on young hatchlings and late-stage eggs of land snails. [8]
The sand collar consists of sand grains cemented together by a gelatinous matrix, with the embedded eggs contained within the matrix. The collar is laid by the female moon snail, and the size of the sand collar gives an indication of the size of the adult female moon snail that laid it; larger species of moon snail lay larger sand collars.
After processing, the eggs may be cream-coloured, pinkish-white, or white, with the eggs generally 3–4 mm in diameter. [3] Some snail eggs may measure at 3–6 mm in diameter. Some commercial snail farms that produce escargot include the production of snail caviar as a part of their operations.
Biomphalaria glabrata snails lay egg masses at rather a high rate (about 1 per day). [5] One snail can lay 14,000 eggs during its whole life span. [32] The periostracum of the embryonic shell (inside the egg) begin to grow in 48-hour old embryos. [34] Amorphous calcium carbonate appear in 54-60-hour old embryos. [34]
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These land snails have opercula, which helps identify them as "winkles gone ashore", in other words, snails within the clade Littorinimorpha and the informal group Architaenioglossa. Members of the snail family Pulmonata , which includes carboniferous land sails and some freshwater snails of the order Basommatophora , are protandrous ...
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[31] [32] About 10 days after fertilisation, the snail lays a batch of on average 50 spherical, pearly-white eggs into crevices in the topsoil, or sheltered under stones. [30] In a year it may lay approximately six batches of eggs. [33] The size of the egg is 3 mm. [30] After snails hatch from the egg, they mature in one or more years.