What are invertebrates Invertebrates are animals that lack a vertebral column or backbone. They are a diverse group of animals that include a large number of phyla. Phyla of invertebrates Porifera: Sponges Cnidaria: Jellyfish, coral, anemones, and hydroids Platyhelminthes: Flatworms Nematoda: Roundworms Annelida: Segmented worms, including earthworms and leeches Mollusca: Snails, clams, octopuses, and squid […]