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Parabasalidea
Subject h. Parabasalidea Subject h. Parabasalidea Scope note in English A group (or phylum) of flagellated, anaerobic EUKARYOTES that are endosymbionts of animals. They lack mitochondria but contain small energy-producing hydrogenosomes. The group is comprised of two major classes: HYPERMASTIGIA and TRICHOMONADIDA. 
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Number of the records: 1