A close encounter of the first kind, according to his taxonomy, is simply seeing a UFO.
When trying to create a taxonomy of emoticons, the easiest method is to go with the categories of emotions that the instant message smileys are designed to convey.
References to works dealing with the taxonomy and geographical distribution of scorpions are given at the end of this article (28).
His activity was by no means confined to palaeobotany, but extended into all branches of botany, more particularly anatomy and phanerogamic taxonomy.
However, owing to the evolution of the vertebral column in various directions, and to the inconstant state of things in certain annectent groups, it is not possible, it seems, to apply the vertebral characters to taxonomy with that rigidity which E.