An order of the Protozoa in the class Zoomas­ti­gophorea comprising the most complex flagellates, both structurally and in modes of division. All inhabit the alimentary canal of termites, cockroaches, and woodroaches. These organisms are multiflagellate, often with complicated blepharoplast-parabasal-axostylar structures. The nucleus is single and the organisms are plastic and slow-moving, generally ovoid to elongate. Flagella occur in spiral rows, in tufts, or over the entire body. These flagellates vary from 15 to 350 micrometers in size. They may be holozoic or saprozoic. Ingestion is usually pseudopodial, in the posterior region. A high degree of adaptiveness exists, and species peculiar to one host species are not viable in another. Sexual processes and multiple fission are known, but trinary fission is most common. Holomastigotoides has spirochetes attached to its trophic body zone.