We don't have synonyms for oligotrich yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are oligotroph.
(n) :
(biology) Any of a group of ciliate protozoa, included among the spirotrichs, with prominent oral cilia, which are arranged as a collar and lapel, in contrast to the choreotrichs where they form a complete circle
(n) :
(biology) Any of a group of ciliate protozoa, included among the spirotrichs, with prominent oral cilia, which are arranged as a collar and lapel, in contrast to the choreotrichs where they form a complete circle