Kalmar "Prosimii" tana nufin wani yanki na primates wanda ya haɗa da nau'o'in lemurs, lorises, bushbaies, da sauran dabbobi masu kama. Waɗannan dabbobi yawanci ƙanana ne zuwa matsakaita, masu manyan idanu da kamanni na musamman. Gabaɗaya suna cikin dare da arboreal, kuma ana iya samun su a wurare daban-daban a faɗin Afirka, Asiya, da Madagascar. Kalmar "Prosimii" ta samo asali ne daga kalmomin Latin "pro" ma'ana "kafin" da "simia" ma'ana "biri", yana nuna gaskiyar cewa waɗannan dabbobin an taɓa tunanin sun fi sauran primates. Koyaya, ba a ƙara yin amfani da wannan rarrabuwa a cikin tsarin haraji na zamani, kuma waɗannan dabbobi a yanzu ana sanya su a cikin tsarin Strepsirrhini.