Matching Pairs InvertebratesOnline version Learn more about invertebrates by Luz Álvarez Herrero 1 JELLYFISH 2 ECHINODERMS 3 MOLLUSCS 4 SPONGES 5 ANNELIDS 6 ARTHROPODS They have a soft muscular body Examples: snail and octopus They are the most common group on Earth. The biggest group are insects. Example: crab, ladybug They stay on the seabed They are protected from predators by hard skin or spikes Examples: Starfish Soft body called umbrella and long tentacles They have a long, soft body divided into segments. Example: Earthworm