ScienceDaily (July 27, 2009) — How do you recognize a new species? A thorough study of the million-year evolution of California's horned lizards, sometimes referred to as "horny toads," shows that when it comes to distinguishing such recently diverged species, the most powerful method integrates genetic, anatomical and ecological information.
http://www.sciencedaily.com/releases/2009/07/090721163115.htm