Protistology 4 (3) 269-277 (2006)
A new microsporidium Paratuzetia kupermani gen. et sp. n. (Microsporidia), a hyperparasite of the
procercoid of the cestode Khawia armeniaca Chol. 1915 (Cestoda, Caryophyllidea)
Larisa G. Poddubnaya 1, Yuri S. Tokarev 2 and Irma V. Issi 2
1 Institute of Biology of Inner Waters RAS, Yaroslavl, Russia
Summary
A new microsporidium Paratuzetia kupermani gen. et sp. n. (Microsporidia), the
hyperparasite of the procercoid of the cestode Khawia armeniaca Chol. 1915 (Cestoda:
Caryophyllidea), is described. Microsporidian development is monomorphic and occurs
in direct contact with the cytoplasm of the host tegument. Division of cells of all life
cycle stages is binary. Meronts possess diplokaryotic nuclear apparatus. Nuclei of
sporogonial stages are single. Sporoblasts and spores develop in individual sporophorous
vesicles. Lumen of the vesicles, 1 µm in diameter, is filled with wide short tubular
structures. Spores are 2.0-2.5 × 1.2-1.4 µm in size, polar tube is anisophilar with 10-12
coils arranged in 2-3 layers in young spores and in a single layer in mature ones.
Polaroplast consists of 2 parts, the posterior lamellar part surrounds the straight region
of the polar tube and, in young spores, also its first coils.
Key words: microsporidia, cestode, procercoid, hyperparasite, Khawia armeniaca,
Paratuzetia kupermani
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