What are invertebrates divided into phyla what?

Invertebrates are primarily divided into several major phyla based on their body structure, developmental patterns, and evolutionary relationships. Key phyla include Porifera (sponges), Cnidaria (jellyfish, corals), Mollusca (snails, octopuses), Annelida (segmented worms), Arthropoda (insects, crustaceans), and Echinodermata (starfish, sea urchins). Each phylum encompasses diverse species that share common characteristics, contributing to the vast diversity of life in aquatic and terrestrial ecosystems.