In 1823, Ignacy Mielżyński presented to the Society of Physics and Natural History of Geneva a memoir with a description of larvae of a beetle parasitizing snails. This discovery was at the origin of an important scientific discussion of naturalists in Geneva and Paris about parasitism but also taxonomic problems related to the morphological dimorphism of various sexes and life stages of insects. This memoir was the only zoological work of Mielżyński. It was published because his first work – on gastropod molluscs – also presented in Geneva, is still in manuscript and as a single copy is kept at Biblioteka Kórnicka in Poland. The young naturalist returned to his country to take part in the November Uprising. He was killed in the fight with the Russian army. The article analyses the two zoological works of Mielżyński and presents the biography of this naturalist.
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