Protistology 4 (2) 135-144 (2005)
Senoma gen. n., a new genus of microsporidia, with the type species Senoma globulifera
comb. n. (syn. Issia globulifera Issi et Pankova 1983) from the malaria mosquito Anopheles messeae Fall.
Anastasiya V. Simakova 1, Tamara F. Pankova 2, Yuri S. Tokarev 3
and Irma V. Issi 3
1 Research-and-production Association on Medical Immunobiological Drugs
"Virion", Tomsk, Russia
Summary
In 1983, a new species of microsporidia from mosquitoes was attributed to the genus Issia and described
as I. globulifera sp. n. basing upon the taxonomic criterion of this genus: formation of two binucleate spores within a
sporophorous vesicle at the end of development. However, the presence of octospores in sporophorous vesicles (besides forms with
two spores) on the smears of the type species of the Issia genus testifies to its dimorphic development. Thus, the
monomorphic species I. globulifera does not satisfy the criteria of the genus. A new genus Senoma should be
established, with the type species possessing the following unique set of characters: 1) the Nosema type of development;
2) the presence of small vesicles, tubular structures and granules over the cell plasma membrane and its numerous extensions;
3) a stable coupling of spores by a large spherical homogenous mass (globule); 4) the absence of a sporophorous vesicle.
Key words: microsporidia, mosquitoes, ultrastructure, life cycle, Anopheles, Senoma gen. n.
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