JD Laurence-Chasen, a student in my invertebrate zoology course last fall, explains how to read phylogenies.
For more information, see: Baum DA, Smith SD, Donovan SSS (2005). The tree-thinking challenge. Science 310, 979–980. doi:10.1126/science.1117727.
The music is “Carefree” by Kevin MacLeod.