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

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 multinu...

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Bibliographic Details
Published in:European journal of protistology 2002, Vol.38 (1), p.19-27
Main Authors: Lom, Jiří, Dykoá, Iva
Format: Article
Language:English
Subjects:
Microsporidia
Nothobranchius rubripinnis
Nuclei of enterocytes
Nucleospora secunda
Ultrastructure
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Summary: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.
ISSN:0932-4739
1618-0429
DOI:10.1078/0932-4739-00844