taxonomist

noun

Etymology: From taxonomy + -ist.

1. Someone whose profession is taxonomy, or who performs taxonomy at a professional level.

   “Hepaticology, outside the temperate parts of the Northern Hemisphere, still lies deep in the shadow cast by that ultimate "closet taxonomist," Franz Stephani—a ghost whose shadow falls over us all.”

   “Ant taxonomists have decided that anything that's worth separating should be separated at the species level, and have no truck with subspecies at all. Butterfly taxonomists, however, like the triple-barrelled name approach and dote on subspecies. As a result, the numbers of ant species and butterfly species are not directly comparable.”