Léon Louis Vaillant (le.ɔ̃ va.jɑ̃; 11 November 1834 – 24 November 1914) was a French zoologist. He is most famous for his work in the areas of herpetology, malacology, and ichthyology. In 1854 he graduated from the College d'Arras, followed by studies in medicine and zoology in Paris. In 1861, he received his medical doctorate, then continued his zoological studies with Henri Milne-Edwards (1800-1885), earning his degree in natural sciences in 1865. In 1875, he became a professor at the Museum of Natural History in Paris. He held a special interest involving the systematics and anatomy of turtles and crocodiles, but also made significant contributions in his investigations of reptilian physiology and behavior. Of his 200-plus scientific writings, 90 of them are based on herpetological subjects. He participated in French naval expeditions on the Travailleur in 1880, 1881 and 1882 and on the Talisman in 1883. The following are several species of marine organisms named after Léon Vaillant: The ribbon worm, Amphiporus vaillanti Joubin, 1902 The squat lobster, Munidopsis vaillantii A. Milne-Edwards, 1881 Solamen vaillanti Issel, 1869 Solariella vaillanti Dautzenberg & H. Fischer, 1896 Turbonilla vaillanti Dautzenberg & Fischer, 1896. The following are four species of reptiles named after Vaillant: Chioninia vaillantii Micrelaps vaillanti Liophidium vaillanti . Dopasia ludovici The following fish are named after Vaillant: The dragon fish, Bathophilus vaillanti Zugmayer, 1911 The shortspine African angler, Lophius vaillanti Regan, 1903 The pike cichlid Crenicichla vaillanti Pellegrin, 1904. Paraliparis vaillanti Chernova, 2004 is a species of snailfish found in the Northwestern Atlantic Ocean primarily in the Laurentia Channel, between Newfoundland and Cape Breton. The following fish are possibly named after Vaillant: Pseudogobio vaillanti (Sauvage, 1878) Études sur les poissons, Mission scientifique au Mexique et dans l'Amérique centrale - Study of fishes. (with Marie Firmin Bocourt 1819-1904).