The species is one of three known species to exist within the genus Bacula, the other two being Bacula morisyuichiroi and Bacula striolata.
Open-Source support includes AMANDA, Bacula, and the minimal mtx program.
Around six months after the SM.73s first appearance, the SM.81 prototype (MM.20099) first flew from Vergiate, near Varese, on 8 February 1935, controlled by test pilot Adriano Bacula.