hexamastix coercens hexamastix coercens hexamastix coercens is a species of parabasalid. hexamastix coercens scientific classification domain: eukaryota (unranked): excavata phylum: metamonada class: parabasalia order: honigbergiellida family: hexamastigidae genus: hexamastix species: hexamastix coercenscepickaa et al., 2010