Invertebrates are animals without a backbone – but that’s the only thing they all have in common! Learn more about some of the many different types of invertebrate, from arthropods to sponges.
- An invertebrate is any animal that does not have a backbone.
- More than 95% of all animal species are invertebrates.
- There are over 30 invertebrate phyla, including Arthropoda, Mollusca and Porifera.
- Sponges have no organs, digestive system or circulatory system.