Maturation timing in the land snailsArchachatina marginata ovum(Pfeiffer) andLimicolaria flammea(Müller) (Pulmonata: Achatinidae)
| Autor: | Rosemary I. Egonmwan |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Invertebrate Reproduction & Development. 46:159-171 |
| ISSN: | 2157-0272 0792-4259 |
| Popis: | Summary The timing of gonadal maturation was studied in two edible species of West African achatinid snails, Archachatina marginata ovum (Pfeiffer) and Limicolaria flammea (Muller), using light microscopic observation of gametogenesis in the ovotestis and oviposition. Additionally, the growth of the reproductive system was analysed by weekly measurement of body weight, shell length and reproductive system in both laboratory-bred and wild snails of both species. The ovotestis in A. marginata ovum and L. flammea produces oocytes and spermatozoa simultaneously. The five active and two inactive gametogenic stages observed in the two species are described and compared. Genitalia development start after the onset of gametogenesis in both species with the male system developing before the female system. The growth of the albumen gland follows the maturation of the gonad in L. flammea, but in A. marginata ovum the growth is cyclical and seasonal. The first oviposition occurs at approximately 19 months of age in A... |
| Databáze: | OpenAIRE |
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