besnoitia tarandi besnoitia tarandi besnoitia tarandi is a species of single-celled parasites that afflicts reindeer. besnoitia tarandi scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: apicomplexa class: conoidasida order: eucoccidiorida family: sarcocystidae genus: besnoitia species: b. tarandi binomial name besnoitia tarandi the beltsville agricultural research center, in collaboration with a finnish university, studied besnoitia tarandi tissue cysts from infected reindeer.