Hierarchy of Emotions

There seems to be a direct relationship between intelligence and the amount of emotions a species is capable of feeling.  Humans have evolved so much that we have more emotions than any other species, with cats, dogs, dolphins and elephants not far behind.  Like species on the tree of life, emotions evolved over time, in a hierarchy of adaptation. 

If we were to evolve even more, there would be other emotions to discover on the continuum of life.  We can already see this happening in our current age because some humans can feel more emotions than others.  For example, the feeling of transcendence cannot be felt by a majority of individuals, but certain people can, especially those who meditate.

The hierarchy of emotions begins with feeling alive.  Everything that lives is capable of feeling this way.  From this primitive emotion, the major ones and their derivatives branched away.  I believe this second tier would consist of love, fear, and sadness, for all the other emotions, like anger and jealousy, derive from them.  

Further derivations in the future will show what other feelings life is capable of having- usually from a combination of two emotions on the tier above them.  For example, there is the nervous-excited feeling most of us get, yet to my knowledge there isn't a word for it because it isn't felt commonly enough.  The feeling of anxiousness doesn't quite describe it because it's more related to impatience.  Once defined, this kind of emotion will combine with another on the same tier to become another, and so forth.  The emotions are like Russian Dolls inside a universal feeling, the most primitive feeling of aliveness resting in the smallest sphere.