Description of Nudispora
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Monomorphic, diplokaryotic and monokaryotic; tansmission unknown; merogony: diplokaryotic merogonial plasmodium divides into numerous diplokaryotic merozoites; sorogony: diplokaryotic sporont divides meiotically into 8 monokaryotic sporoblasts which bud off simultaneously, takes place in direct contact with host cell cytoplasm, sporophorous vesicle not formed, early sporogony associated with production of laminar and tubular extracellular structures composed of the same material as the future exospore,, spores, 3 x 1.6 µm, are ovoid and uninucleate. Exospore is threelayered. Polaroplast has two lamellar parts, the membranes being more compressed anteriorly. Polar tube is isofilar, with 67 coils in a single rank. Comment: unusual features of this microsporidium are the octosporous development in the absence of a sporophorous vesicle and the formation of a network of extracellular structures in the host cell cytoplasm, which possibly represent material of an abortive sporophorous vesicle. Type species N. biformis Larsson
