Reference work entry
Latin: spira = winding, nucleus.
Genus of flagellates of birds and of fish. S. meleagridis is synonym to Hexamita meleagridis (6–12 μm, 6 anterior, 2 posterior flagella), Spironucleus spp. from the intestine of fish show the same morphology (Figs. 1 and 2), they parasitize in the intestine and may lead to important losses in ornamental fish cultivation. Transmission occurs via cysts with a size of 4–5 × 6–7 μm. Diplomonadida.
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