Which scientific term for animals without backbones did Lamarck introduce?

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Black and white portrait of Jean-Baptiste Lamarck, French naturalist, shown from the chest up wearing a high-collared shirt, cravat, and jacket. — Lamarckism Jean-Baptiste Lamarck.

The scientific term that Jean-Baptiste Lamarck introduced for animals without backbones is invertebrate.1

While serving as a professor at the Muséum National d’Histoire Naturelle, Lamarck was tasked with classifying a vast and poorly analyzed portion of the animal kingdom. He initially referred to this group as "animals without vertebrae" before coining the term invertebrate to describe them.1