IUCN threat status:

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Comprehensive Description

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Description of Anncaliia

The type species is A. meligethi Issi, Krylova and Nikolaeva, 1993 in fat body and muscles of Meligethes aeneus (Coleoptera, Nitidulidae). Monomorphic, diplokaryotic. Meiosis uknown. Transmission unknown. Merogony: meronts are rounded cells with one or two diplokarya. Their limiting membrane has an additional outer layer of thin tubules connected by finely granular material. Sporogony: in direct contact with host cell cytoplasm. Disporoblastic, the sporoblast wall forming tubular structures penetrating host cell cytoplasm. Spores, 44.8 x 23 µm, oval, diplokaryotic. The anterior member of the diplokaryon is triangular, the posterior one is hemispherical. Exospore is thick, composed of two layers, an inner thicker one of high electron density and an outer one, thinner and less electron dense, ornamented by tubules stretching perpendicularly to the long axis of the spore into the cytoplasm of the host cell. The outer layer is more conspicuous in young spores, but the points of departure of tubules from the exospore can also be seen in mature spores. Polaroplast is bipartite, with anterior lamellar and posterior tubular parts. Polar filament anisofilar, with 1314 coils in one rank. Comment: the genus is similar to the genus Nosema, differing by the presence of tubular structures on the surface of all developmental stages.

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