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The ultrastructure of the trophic cells of the protostelid planoprotostelium aurantium



The ultrastructure of the trophic cells of the protostelid planoprotostelium aurantium



Protoplasma 113(3): 165-177



The protostelid P. aurantium Olive et Stoianovitch has tropic cells which are either amoebae of flagellates. The general morphology and ultrastructure are consistent with what has been reported for other Eumycetozoa (protostelids, myxomycetes, and dictyostelids). The flagellar apparatus structure has the same basic pattern as that of other flagellate eumycetozoans. It shares with all these an anteriorly directed flagellum and centriole and microtubule arrays (MTA) 2-4. Unlike more primitive species which have 2 centrioles per flagellar apparatus, P. aurantium has only one. Also, the flagellar apparatus is independent of the nucleus in P. aurantium, not linked to it as in the primitive species. These features are useful in explaining the differences in swimming behavior between P. aurantium and biflagellate species. Evidence is presented to show that P. aurantium is closely related to the non-flagellate Protostelium mycophaga Olive et Stoianovitch.

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