Invertebrate
Adapted from Wikipedia · Explorer experience
What Are Invertebrates?
Invertebrates are animals that do not have a backbone. Most animals on Earth are invertebrates! They come in many shapes and sizes, from tiny bugs to big squids. Some well-known invertebrates include insects, sponges, jellyfish, and starfish.
Where Do They Live?
Invertebrates live almost everywhere! You can find them in forests, oceans, gardens, and even in your home. They are very important for nature. For example, bees help plants grow by moving pollen from flower to flower.
Fun Facts About Invertebrates
Invertebrates have many interesting ways to live and move. Some, like spiders, have eight legs. Others, like octopuses, have eight arms! Many invertebrates can change their shape or color to hide or find food.
Here are some of the most common groups of invertebrates and how many species are in each group:
| Invertebrate group | Phylum | Image | Estimated number of described species |
|---|---|---|---|
| Insects | Arthropoda | 1,000,000 | |
| Arachnids | Arthropoda | 102,248 | |
| Gastropods | Mollusca | 85,000 | |
| Crustaceans | Arthropoda | 47,000 | |
| Bivalves | Mollusca | 20,000 | |
| Sea anemones, corals, sea pens | Cnidaria | 2,175 | |
| Cephalopods | Mollusca | 900 | |
| Velvet worms | Onychophora | 165 | |
| Horseshoe crabs | Arthropoda | 4 | |
| Others jellyfish, echinoderms, sponges, etc. | — | — | 68,658 |
| Total: | ~1,300,000 |
Most of these animals are very small, but they are very important for our world. They help plants grow, clean water, and keep nature healthy.
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