Gametogenic cycle in Vertigo pusilla O. F. Müller, 1774 (Gastropoda: Pulmonata: Vertiginidae)
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Department of General Zoology, Zoological Institute, Wrocław University, Poland
Museum of Natural History, Wrocław University, Poland
Submission date: 2005-04-04
Acceptance date: 2005-05-15
Publication date: 2020-07-03
Folia Malacol. 2005;13(1):43–47
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.
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