Invertebrates

Up to now, less familiar and more diverse animals without backbones (invertebrates) were less carefully considered. Linnaeus had lumped them all into the class Vermes (Latin for 'worms"). Lamarck divided the invertebrates into groups like the crustaceans, echinoderms, and distinguished between the eight-legged arachnids and the six-legged insects.
 Jean-Baptiste de Lamarck France 1801 Invertebrates

Up to now, less familiar and more diverse animals without backbones (invertebrates) were less carefully considered. Linnaeus had lumped them all into the class Vermes (Latin for 'worms"). Lamarck divided the invertebrates into groups like the crustaceans, echinoderms, and distinguished between the eight-legged arachnids and the six-legged insects.