In 1840 he was appointed professor of geology and mineralogy at the University of Toulouse, and during the following year was a professor of zoology and botany at Rennes.
In regard to his educational background, Dujardin was largely self-taught, the son of a watchmaker.

Dujardin worked with microscopic animal life, and in 1834 proposed that a new group of one-celled organisms be called Rhizopoda.
He denied naturalist Christian Gottfried Ehrenberg's theory that microscopic organisms were "complete organisms" similar to higher animals, specifically noting that they had specialized structures unique to single-celled organisms, which meant that foraminifera he was studying was not, as his contemporaries believed it to be, a mollusk.
 In addition to his studies of microscopic life, he did extensive research on invertebrate groups that included echinoderms, hexapods, helminths and cnidarians.

In the Foraminifera, he noticed an apparently formless life substance that he named "sarcode", later renamed protoplasm by Hugo von Mohl (1805–1872).

Dujardin also remains famous for the identification and the first description in 1850 of the mushroom bodies (corpora pedunculata) in the hymenopteran brain (bee, bumblebee, sphex, ant, fruitfly Drosophila melanogaster, etc.),
which he postulated for the first time that they were the site of intelligence.
This major discovery will eventually prove to be almost accurate, as these structures are now considered the place where memory and many other behaviors are formed and processed in invertebrates.
In 1840 he was appointed professor of geology and mineralogy at the University of Toulouse, and during the following year was a professor of zoology and botany at Rennes. In regard to his educational background, Dujardin was largely self-taught, the son of a watchmaker.
Dujardin worked with microscopic animal life, and in 1834 proposed that a new group of one-celled organisms be called Rhizopoda. He denied naturalist Christian Gottfried Ehrenberg's theory that microscopic organisms were "complete organisms" similar to higher animals, specifically noting that they had specialized structures unique to single-celled organisms, which meant that foraminifera he was studying was not, as his contemporaries believed it to be, a mollusk.  In addition to his studies of microscopic life, he did extensive research on invertebrate groups that included echinoderms, hexapods, helminths and cnidarians.
In the Foraminifera, he noticed an apparently formless life substance that he named "sarcode", later renamed protoplasm by Hugo von Mohl (1805–1872).
Dujardin also remains famous for the identification and the first description in 1850 of the mushroom bodies (corpora pedunculata) in the hymenopteran brain (bee, bumblebee, sphex, ant, fruitfly Drosophila melanogaster, etc.), which he postulated for the first time that they were the site of intelligence. This major discovery will eventually prove to be almost accurate, as these structures are now considered the place where memory and many other behaviors are formed and processed in invertebrates.
Félix Dujardin