Growth and Maturation Pattern in the African Giant Snail, Achatina fulica (Ferussac) (Stylommatophora : Achatinidae)

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  • アフリカマイマイの成長と成熟様式
  • アフリカマイマイの成長と成熟様式〔英文〕
  • アフリカマイマイ ノ セイチョウ ト セイジュク ヨウシキ エイブン

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Shell growth and the maturation of reproductive system in the giant African snail, Achatina fulica, were studied. The growth rate of shell length was estimated based on the increase of peristome thickness. The correlation of shell growth and sexual maturity was investigated. The reproductive gland was formed in one year after hatching, and shell growth continued during some additional months. In most land snail, lip reflection is commonly considered to indicate sexual maturation. However, in A. fulica study lip reflection was not observed. Shell growth continued for some time even after the reproductive system fully formed. They produce only sperm while their shell growth continues. They began to produce both sperms and eggs when they stopped shell growth and became completely hermaphroditic.

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