What are the sub groups of invertebrates?

The sub groups of invertebrates include, sponges (Porifera), jellyfish (Cnidaria, snails and squids (Mollusca) and flatworms (Platyhelminthes). Then there are roundworms (Nematoda), leeches (Annelida), insects and arachnids (Arthropoda), and the starfish, sea urchins and sea cucumbers (Echinodermata)