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Temporal pattern of the double sperm line production in Tubifex tubifex (Annelida, Oligochaeta)

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Abstract

Laboratory cohort cultures of the tubificid Tubifex tubifexwere carried out at 21 °C in homogeneous conditions. Our aim was to study the temporal pattern of spermatogenesis of the two sperm lines which characterise this species. Starting from the second week after cocoon laying, we analysed the seminal vesicle content. We counted the cysts in the vesicles and arranged them into three classes: premeiotic, paraspermatids and euspermatids. Our results show that spermatogenesis begins early, at week 3, but cysts of spermatids are not found until week 5 for the parasperm line and week 6 for the eusperm line. These data are derived from a preliminary study of complex population dynamics. Nonetheless, they allow us to formulate some hypothesis regarding the mechanism which regulate the production of the two types of sperm.

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Authors and Affiliations

  1. Dipartimento di Biologia, Università di Milano, via Celoria 26, 20133, Milano, Italy

    Silvia Boi

  2. Dipartimento di Biologia, Università di Milano, via Celoria 26, 20133, Milano, Italy

    Marco Ferraguti

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  1. Silvia Boi
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  2. Marco Ferraguti
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Correspondence to Marco Ferraguti.

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Boi, S., Ferraguti, M. Temporal pattern of the double sperm line production in Tubifex tubifex (Annelida, Oligochaeta). Hydrobiologia 463, 103–106 (2001). https://doi.org/10.1023/A:1013191205524

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