See the beautiful tattoo visualization via Monica Quast, who is a Ph.D. student at the University of Campinas, Brazil, working on bivalve phylogeography. The organisms depicted are (going clockwise): a cyanobacterium, a foraminiferan, 3 diatoms, an oak leaf and acorn, a Spirogyra cell, a red cage fungus, a stauromedusa, a nautilus, a tardigrade, an ophiuroid, and a badger. \\ At first biologists could draw only small trees, typically with a dozen branches at most. They were held back by the fact that a group of species may possibly be related in many different ways. If a biologist adds more species to a group, the possibilities explode. For 80 species, there are more trees than there are atoms in the known universe. Simply comparing every single tree would be impossible. Fortunately, mathematicians developed statistical methods for searching quickly through potential trees to find the ones that do the best job of explaining all the evidence. - Adriano