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In older classifications, a phylum of parasitic or free-living heterotrophic protozoa that possess one or more undulipodia (flagella) for locomotion. The organisms in this phylum have now been reclassified: members lacking mitochondria are classed as excavates, along with euglenids, while others, including Trypanosoma (the sleeping-sickness parasite) and Naegleria, which have mitochondria with flattened cristae, are placed in the Discomitochondria.

Subjects: Biological Sciences.

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