hypermastigia hypermastigia hypermastigia (hypermastigids) within microbiology, is the name used for a group of flagellate parasites which were placed under the excavata class. they are now treated as belonging to one of the groups tritrichomonadea, hypotrichomonadea, or trichomonadea within the parabasalia. hypermastigia hypermastigid scientific classification domain: eukaryota phylum: metamonada subphylum: trichozoa (unranked): parabasalia groups included tritrichomonadea hypotrichomonadea trichomonadea cladistically included but traditionally excluded taxa trichonymphea spirotrichonymphea cristamonadea