Para rubber tree - originally from South America and the source of latex used for commercial rubber. Ichthyosaurs, dolphins, and sharks. Monophyly - A taxonomic group is monophyletic if a single species is the ancestor of all the other species in the group. The species is a very special unit of classification because species seems to be a natural unit of classification. Different higher taxa have varying amounts of importance in classification.
Botanists usually speak of plant families , while entomologists refer to insect orders .
The Phenetics School of Classification - Phenetics is also known as numerical taxonomy. For a group of different taxa which we wish to compare, the measures of similarity for each pair of taxa are described in a similarity matrix . We will use a simple similarity matrix to construct a phenetic tree. Practically speaking, phenetics might represent true evolutionary relationships if we had a huge number of characters. If we are comparing complete genomes, it might work.