1. Arthropods

2. and Echinoderms

3. Invertebrates are animals that have no backbone.

5. Species in the Phylum: Arthropoda are invertebrates with an exoskeleton, a segmented body, and jointed legs.

6. There are more than 1 million kinds of arthropods on Earth.

7. An exoskeleton is a hard, outer covering.

8. Molting is to leave an exoskeleton and grow a new one.

11. A crustacean is an arthropod that has a hard, exoskeleton, two pairs of antennae, and a mouth for crunching and grinding.

12. Crustaceans can ________ certain parts of their body. A ___________ can regenerate its claws. Most crustaceans live in _______________ and get oxygen from the water through _________. Gills are

13. *Phylum: Echinodermata __________, ________, __________, ________, ____________, and _____________. * Echinoderm means _______________.

14. There are ______ characteristics of echinoderms. All echinoderms have: Spiny skin An internal skeleton, endoskeleton A five part body A water vascular system Tube feet

15. * All echinoderms have __________. Some of them have small hair-like spines, like the starfish. * Some echinoderms have long spines, like the sea urchin.

16. * The internal skeleton of an echinoderm is made of _______________________. * The water vascular system also helps an echinoderm _____. * An echinoderm’s water vascular system is _________________________________.

17. * Echinoderms have __________. * An echinoderm’s tube feet are used for _________________________________.

18. * Starfish are also called ___________. * Starfish have __________ arms connected to a central body. * On the underside of the arms are hundreds of ___________ that look like suction cups. Class: Asteroidea

19. * A starfish uses its tube feet to move and to open its food. * A starfish is able to regenerate its arms.

20. * Sea urchins have longer and sharper ________ that they use to defend themselves. * Some sea urchins have ________ spines. Class: Echinoidea

21. * Sea urchins have a mouth hidden under its body, surrounded by lips of softer tissue. * A sea urchin uses its five teeth to eat ________. * A sea urchin is not very active. Sometimes, it does move slowly using its __________. When not moving it uses its feet to stick to the ocean floor.

22. Class: Holothuroidea Class: Echinoidea, like sea urchins! Class: Crinoidea Filter food particles of mostly plankton with feather-like arms Most live on sea floor as scavengers of plankton and decaying matter