In my previous post (#51) I meant to say “many species and genera” not “every”.
I came across the word cladistics in "Darwin's Ghost" by Steve Jones ... a modern rewrite of Darwin's "Origin of the Species," with the same exact chapter names in Darwin's work.
Following is from Wikipedia ...
"History of cladistics The term clade was introduced in 1958 by Julian Huxley, cladistic by Cain and Harrison in 1960, and cladist (for an adherent of Hennig's school) by Mayr in 1965.[6] Hennig referred to his own approach as phylogenetic systematics. From the time of his original formulation until the end of the 1980s cladistics remained a minority approach to classification. However, in the 1990s it rapidly became the dominant method of classification in evolutionary biology. Computers made it possible to process large quantities of data about organisms and their characteristics. At about the same time the development of effective polymerase chain reaction techniques made it possible to apply cladistic methods of analysis to biochemical and molecular genetic features of organisms as well as to anatomical ones."
There's a lot to be learned out there Folka.