Giard \zhē-är\ (audio pronunciation) Alfred Mathieu (1846–1908),
French biologist. Giard was an all-around naturalist. He was a student of morphology, phylogeny, and ethology and a supporter of both Darwinism and Lamarckism. He investigated a wide range of topics in biology, including regeneration, sexuality, metamorphosis, experimental parthenogenesis, hybridization, autotomy, and mimicry. The genus Giardia
was named in his honor in 1882 by Johann Kunstler.