classification of living organisms
• (n.) The classification of living organisms according to their structural character; taxonomy.
Bi'o·tax`y noun [ Greek ... life + ... arrangement.] (Biol.) The classification of living organisms according to their structural character; taxonomy. 
biotaxy, biotactic 1. The directed reaction of a motile organism towards (positive) or away from (negative) a biological stimulus. 2. The classification of living beings according to their anatomical characteristics.