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

I. Origin and differentiation of nurse cells


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.

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Correspondence to Dr. Massimo Trentini.

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The authors are grateful to Dr. Bruno Sabelli for his support and to Mr. Francesco Monte for his technical assistance

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Trentini, M., Scanabissi, F.S. Ultrastructural observations on the oogenesis of Triops cancriformis (Crustacea, Notostraca). Cell Tissue Res. 194, 71–77 (1978).

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Key words

  • Oogenesis
  • Intercellular bridges
  • Nurse cell differentiation
  • Notostraca (Triops cancriformis)