New systematics differs from classical systematics in:
(a) Morphological definition of species has given way
to biological cytology, physiology, biochemistry and ecology etc.
(b) Species are not fixed or static but highly dynamic.
(c) Species no longer occupy the central position in the
work of systematics, instead emphasis has shifted over sub-species and populations.
(d) Experimental variability is introduced to measure various parameters. Statistical data is compiled to know the scale of primitiveness, inter-relationships and advancements.