Johann Friedrich Theodor (Fritz) Müller (1822–97)

German naturalist. Emigrated to the German colony in Blumenau, Brazil, in 1852. Taught mathematics at the Lyceum in Destêrro (now Florianópolis), 1856–67. Naturalista viajante of the National Museum, Rio de Janeiro, 1876–91. His anatomical studies on invertebrates and work on mimicry provided important support for CD’s theories.