Cell and Tissue Research

, Volume 194, Issue 1, pp 71–77 | Cite as

Ultrastructural observations on the oogenesis of Triops cancriformis (Crustacea, Notostraca)

I. Origin and differentiation of nurse cells
  • Massimo Trentini
  • Franca Sabelli Scanabissi


Each ovarian follicle of Triops cancriformis is four-celled; these cells (one oocyte and three nurse cells) are interconnected by cytoplasmic bridges. In the course of differentiation, the nurse cells are early recognizable; they increase in size more than the oocyte and their nuclei contain many nucleoli. For the first time in Arthropoda, yolk globules are reported to be present in nurse cell cytoplasm; these globules arise from the smooth endoplasmic reticulum. The functional significance of the intercellular bridges and the trophic role of the nurse cells are discussed.

Key words

Oogenesis Intercellular bridges Nurse cell differentiation Notostraca (Triops cancriformis


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Copyright information

© Springer-Verlag 1978

Authors and Affiliations

  • Massimo Trentini
    • 1
  • Franca Sabelli Scanabissi
    • 1
  1. 1.Institute of Zoology, University of BolognaBolognaItaly

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