Invertebrates animals without backbones

group	Features	example
True worms	Body is tubular and or made up of segments Tube like digestive system	Tapeworm Pinworms
flatworms	Breathe through their skin Unsegmented Body	Hookworms
Sponges	Take in water through pores little holes in their bodys from which they filter take out little bits of food	Demosponge
Cnidarians	Hollow body with specialized cells that they use for capturing prey Live in water	Box jellyfish Jellyfish
molluscs	Most live in the sea Most have shells Unsegmented body	Octopus Squid
Echinoderms	A skeleton made of five parts Tube feet Live in the sea	Starfish Blastoid
arthropods	Jointed legs Divided sub groups of four	Insect Spiders

Crustaceans	Most have aquatic Body divided in three parts Most breathe with gills Hard other skeletons	Crab Krill
Myriapods	Many pair of legs Single pair of antenna Simple eyes	Centipedes Millipedes
Insects	Body divided into three parts Three pair of legs and two pairs of wings One pair of antenna on head Compound eyes	Bee Ant Termite
Arachnids	Body divided into two parts Four parts of legs and no wings No antennae	Scorpion Sun spiders