Comparison of Minyomerus species in hierarchical trees. Hierarchical display of member taxa uses a screen more efficiently than that of higher taxa path, because the latter results in sparse screen containing diagonal name path. Although a taxon concept is represented by a pair of intent and extent represented by higher taxonomy and member taxa, respectively, it is better to focus on either of them at once on a screen because of the nature of tree diagrams. Users can adjust what is shown on the display by scrolling hierarchies and resizing the display area to focus on their interest, e.g. showing membership hierarchies only. An auxiliary window pops up by placing cursor (not shown for clarity) on a name usage which gives summary of higher taxa path.