Traditional taxonomists used physiological makers of the organism and some even assigned numerical value to these markers. This lead to confusion as organisms can be very clos
…ely related in an evolutionary and family sense and look nothing alike, Also analogous traits were confusing here. Cladists use only evolutionary relationships that can be shown to be on the branching tree of evolution and that have empirical support, such as genetic analysis. This can lead to a bit of ridiculousness as birds to a strict cladist are just dinosaurs! ( Full Answer )