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Ultrastructure of Nucleospora secunda n. sp. (Microsporidia), parasite of enterocytes of Nothobranchius rubripinnis

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A new intranuclear microsporidium, Nucleospora secunda n.sp., infecting intestinal epithelial cells of Nothobranchius rubripinnis Seegers, 1986, is described. Developmental stages and spores are isolated from one another in the karyoplasm. Merogony proceeds from simple uninucleate meronts to multinucleate meronts. Transformation into sporogonial plasmodia is marked by the appearance of ellipsoidal dark bodies, comparable to polar tube precursors, which later coalesce to form the turns of the polar tube. Primordia of the extrusion apparatus are already established in the plasmodium before it starts to cleave into separate sporoblasts. Ellipsoidal mature spores are of average size 1.6 × 0.8 m and have 4 to 5 turns of the polar tube. The polaroplast consists of an outer region of closely spaced lamellae, enclosing a region of widely spaced lamellae or loose flat cisternae. Tubular inclusions appear in the karyoplasm of infected nuclei.

Keywords: Microsporidia; Nothobranchius rubripinnis; Nuclei of enterocytes; Nucleospora secunda; Ultrastructure

Document Type: Original Article


Affiliations: Institute of Parasitology, Academy of Sciences of the Czech Republic, Branišovská 31, 370 05 České Budějovice, Czech Republic

Publication date: April 1, 2002

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