Citations:heptasome


 * 1921,, “Types of Mutations and Their Possible Significance in Evolution” in  LV, № 638 (May–June 1921), page 259, footnote 2:
 * The following terms are suggested to designate sets with numbers of chromosomes from 1 to 12: monosome, disome, trisome, tetrasome, pentasome, hexasome, heptasome, oktasome, enneasome, dekasome, hendekasome, dodekasome.