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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Ref ID : 7908

A.P. Myl'nikov; Ultrastructure and Biology of Certain Representatives of the Order Spiromonadida (Protozoa). Hydrobiological Journal 27(6):97-107, 1992 (Originally published in Zoologicheskiy zhurnal 7:5-15, 1991)

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Ultrastructure and biology of two freshwater and one marine species of predatory spiromonads are examined. The life cycle includes trophonts preying on smaller flagellates and reproductive cysts. The cells of the trophonts contain a microtubular conoid, a three-membrane pellicle, micropores, subpellicular microtubules, micronemes, rhoptry-like bodies, and mitochondria with tubular cristae. A small cylinder is noted in the transition zone of flagella. In the cells of two species, trichocysts and unsegmented mastigonemes are found on the anterior flagellum. Diagnosis of the order Spiromonadida is modified and clarified.