Gametogenic cycle in Vertigo pusilla O.F. Muller, 1774 (Gastropoda: pulmonata: Vertiginidae)

• Autorzy: Mazurkiewicz M. , Pokryszko B. M.
• Języki publikacji: EN

Abstrakty

EN

Gonads of V. pusilla at various growth stages were examined with standard histological methods. The first gonial cells appeared at the stage of 3.3 whorls: few and poorly developed gonad vesicles contained fine mitotically dividing cells and cells in meiotic prophase, with the first growing oocytes in the peripheral parts of the vesicles. At 4-whorl stage the oocytes entered vitellogenesis and increased in volume. In subadult individuals the oocyte volume and the gonad volume increased considerably; besides the advanced vitellogenic oocytes new oocytes appeared, the number of spermatids increased and the first spermatozoa were observed. The gonad of pre-reproductive adults contained numerous late-vitellogenic oocytes, young growing oocytes and many spermatozoa. In post-reproductive individuals there were no mature oocytes, spermatozoa were few, but the presence of young oocytes and mitotically dividing cells indicated resumption of gamete production.

• Wydawca: -
• Czasopismo: Folia Malacologica
• Rocznik: 2005
• Tom: 13
• Numer: 1
• Opis fizyczny: p.43–47,fig.,ref.

Twórcy

autor

Mazurkiewicz M.

• Department of General Zoology, Zoological Institute, Wroclaw University, Sienkiewicza 21, 50-335 Wroclaw, Poland

autor

Pokryszko B. M.

• Museum of Natural History, Wroclaw University, Sienkiewicza 21, 50-335 Wroclaw, Poland

Uwagi

PL

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