One route taken by the discipline, the cladistique (inherited the work of Willy Hennig), based on the idea that shared characters (said derivatives) by several species often comes from relatives.
Moja ya njia zilizochukuliwa na nidhamu, the cladistique (kurithi kazi ya Willy Hennig), kulingana na wazo kwamba pamoja wahusika (alisema derivat) kwa spishi kadhaa mara nyingi linatokana na jamaa.