Invertabrates: Group's

Group	Features	Examples
True worms (12 000 species)	Body is tubular and/or made up of segments. Tube-like digestive system.	Annelid. Round Worm. Ribbon worm.
Flatworms (12 000 species)	Breathe through their skin. Unsegmented body.	Tapeworms. Turbellaria. Monogenea.
Sponges (10 000 species)	Take in water through pores (little holes) in their bodies from which they filter (take out) little bits of food.	Demosponge Homoscleromorpha Stromatoporoid
Cnidarians (9 000 species)	Hollow body with specialised cells (stingers) that they use for capturing prey. Live in water.	Jellyfish Box jellyfish True jellyfish
Molluscs (100 000 species)	Most live in the sea. Most have shells. Unsegmented body.	Squid Octopus Chitons
Echinoderms (9 000 species)	A skeleton made up of five plates. Tube feet. Live in the sea. Jointed legs. Divided into four further sub-groups.	Sea cucumber Blastoid Crinoid
Arthropods (1 000 000 species )	Crustaceans Most are aquatic. Body divided into three parts. Most breathe with gills. Hard outer skeleton.	Spider Crab Insects
	Myriapods Many pairs of legs. Single pair of antennae. Simple eyes.	Centepedes Miliipededs Pauropoda
	Insects Body divided into three parts. Three pairs of legs and two pairs of wings. One pair of antennae on the head. Compound eyes.	Spider Bee Ant
	Arachnids Body divided into two parts. Four pairs of legs and no wings. No antennae.	Sun spider Acari Dipluridae

Group	Features	Examples
True worms (12 000 species)	Body is tubular and/or made up of segments. Tube-like digestive system.	Annelid. Round Worm. Ribbon worm.
Flatworms (12 000 species)	Breathe through their skin. Unsegmented body.	Tapeworms. Turbellaria. Monogenea.
Sponges (10 000 species)	Take in water through pores (little holes) in their bodies from which they filter (take out) little bits of food.	Demosponge Homoscleromorpha Stromatoporoid
Cnidarians (9 000 species)	Hollow body with specialised cells (stingers) that they use for capturing prey. Live in water.	Jelly fish Box jellyfish True jellyfish
Molluscs (100 000 species)	Most live in the sea. Most have shells. Unsegmented body.	Squid Octopus Chitons
Echinoderms (9 000 species)	A skeleton made up of five plates. Tube feet. Live in the sea. Jointed legs. Divided into four further sub-groups.	Sea cuumber Blastoid Crinoid
Arthropods (1 000 000 species )	Crustaceans Most are aquatic. Body divided into three parts. Most breathe with gills. Hard outer skeleton.	Spider Crab Insects
	Myriapods Many pairs of legs. Single pair of antennae. Simple eyes.	Centepedes Miliipededs Pauropoda
	Insects Body divided into three parts. Three pairs of legs and two pairs of wings. One pair of antennae on head. Compound eyes.	Spider Bee Ant
	Arachnids Body divided into two parts. Four pairs of legs and no wings. No antennae.	Sun spider Acari Dipluridae