isotricha intestinalis isotricha intestinalis isotricha intestinalis is a species of holotrich protozoa in the class litostomatea. isotricha intestinalis scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: ciliophora class: litostomatea order: vestibuliferida family: isotrichidae genus: isotricha species: i. intestinalis binomial name isotricha intestinalisstein, 1859 description isotricha intestinalis can be 200 micrometers long, and is distinguishable by its mouth position. they are the largest protozoans present in the rumen of sheep. this species has microbody-like organelles, and a highly granular appearance.