What the 8 types of animals without backbone?

Animals without a backbone are classified as invertebrates, and they include several major groups:

1. Porifera (sponges)
2. Cnidaria (jellyfish, corals, and sea anemones)
3. Platyhelminthes (flatworms)
4. Nematoda (roundworms)
5. Annelida (segmented worms)
6. Mollusca (snails, clams, and octopuses)
7. Arthropoda (insects, arachnids, and crustaceans)
8. Echinodermata (starfish and sea urchins)

These groups encompass a diverse range of species, each with unique characteristics and adaptations.