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The larval development stages of the Japanese snail, Rapana thomasiana, Gross 1861, in the egg capsule


, : The larval development stages of the Japanese snail, Rapana thomasiana, Gross 1861, in the egg capsule. Turkish Journal of Zoology 27(4): 331-337

In the present study, the larval development stages in the egg capsule of the Japanese snail (Rapana thomasiana, Gross 1861), distributed in the Black Sea were investigated. At the moment of capsule release, the diameter of the spherical egg was 151.5 [plus or minus] 2.61 [mu]m. After the capsule was released, the eggs gradually lost their spherical structure. After the completion of the early larval development stage in the egg capsule, the larvae hatched from the capsule as a veliger on day 20. The larvae were pelagic during the following 5 days and settled to the bottom day 25. The length and width of the settled larvae reached 426.8 [plus or minus] 2.84 [mu]m and 305.6 [plus or minus] 2.2 [mu]m with a growth rate of 181.2% and 101.7%, respectively.

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