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A new microsporidium Fibrillaspora daphniae g. n. sp. n. infecting Daphnia magna (Crustacea: Cladocera) in Siberia and its taxonomic placing within a new family Fibrillasporidae and new superfamily Tubulinosematoidea (Opisthosporidia: Microsporidia).
Parasitology Research 2018 March
Infection with a new microsporidium, Fibrillaspora daphniae g. n. sp. n., was found in a local Daphnia magna population in Tomsk region (Western Siberia, Russia) at the prevalence rate of 52%. Histological sections showed parasite cells entirely encompassing the host haemocoel. Methanol-fixed spores were elongate, oval, 4.8 ± 0.3 μm × 2.3 ± 0.2 μm in size. All developmental stages were in direct contact with the host cell cytoplasm, with single nuclei, and division by binary fission. The sporont surface was covered with an additional outer layer composed of fine tubules. The spores possessed a thick endospore, large posterior vacuole filled with electron-dense granules, and a bipartite polaroplast composed of anterior lamellar and posterior globular elements. The polar tube was slightly anisofilar, with 13-19 coils arranged in one row; the two posterior coils were of lesser diameter. The small subunit ribosomal RNA gene sequence was deposited in Genbank under accession # MF278272. Considering the sister relationship between Fibrillanosema crangonycis and our new isolate described here as Fibrillaspora daphniae, we propose a new family Fibrillasporidae fam. n. to contain these two genera and the descendants of their common ancestor. A new superfamily Tubulinosematoidea superfam. n. is proposed as a monophyletic assemblage of Fibrillasporidae fam. n. and Tubulinosematidae.
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