This document provides descriptions of various invertebrate phyla, including their characteristics, classification, anatomy, and life cycles. It covers porifera, cnidaria, platyhelminthes, nematodes, annelids, molluscs, arthropods, echinoderms, and discusses their features like radial symmetry, soft bodies, exoskeletons, and methods of feeding, breathing, and reproduction. Interactive elements and external links are also included for further learning.

1. Invertebrates HOME RESOURCES ACTIVITY LINKS CONTENTS RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

2. Contents Invertebrates Porifera and Cnidaria Porifera Cnidaria Platyhelminthes Characteristics Molluscs Characteristics Classification Arthropods Characteristics Classification Orders of insects Insect mouths Metamorphosis Echinoderms Characteristics Classification Annelids Characteristics Nematodes Characteristics HOME HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

3. Resources HOME What are porifera like? What are cnidaria like? How are molluscs classified? What are molluscs like? What are arthropods like? How are arthropods classified? What are insect mouths like? Metamorphosis of the monarch butterfly What are echinoderms like? How are echinoderms classified? HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK What are Platyhelminthes like? Links Interactive activity: What do you know about invertebrates? Animation: Arthropods What are Annelids like? What are Nematodes like? Orders of insects

4. What are porifera like? Sponges osculum channels atrium cavity Porifera have no organs. water + nutrients water pores HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

13. How are molluscs classified? snail slug limpet Cephalopods Bivalves octopus Gastropods nautilus cuttlefish scallop mussel HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

14. Animation: Arthropods HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

18. Crustaceans How are arthropods classified? Myriapods Insects Arachnids HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

19. Orders of insects Hymenoptera Dermaptera Lepidoptera Diptera Orthoptera Coleoptera Hemiptera Odonata Siphonaptera HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

20. What are insect mouths like? Ants have mouths for chewing. Bees have mouths for chewing and sucking. Butterflies have mouths for sucking. HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK Mosquitoes have mouths for piercing and sucking.

21. What are insect mouths like? Ants have mouths for chewing. GO BACK HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK Bees have mouths for chewing and sucking. Butterflies have mouths for sucking. Mosquitoes have mouths for piercing and sucking.

22. What are insect mouths like? Butterflies have mouths for sucking. GO BACK HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK Ants have mouths for chewing. Bees have mouths for chewing and sucking. Mosquitoes have mouths for piercing and sucking.

23. What are insect mouths like? Ants have mouths for chewing. Bees have mouths for chewing and sucking. Butterflies have mouths for sucking. Mosquitoes have mouths for piercing and sucking. GO BACK HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

24. What are insect mouths like? Ants have mouths for chewing. Bees have mouths for chewing and sucking. Butterflies have mouths for sucking. Mosquitoes have mouths for piercing and sucking. GO BACK HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

25. The Metamorphosis of a Monarch butterfly SANTILLANA THE METAMORPHOSIS OF A MONARCH BUTTERFLY CLICK HERE HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

26. The metamorphosis of a Monarch butterfly SANTILLANA END THE METAMORPHOSIS OF A MONARCH BUTTERFLY HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

29. How are echinoderms classified? Echinoidea Ophiuroidea Crinoidea Holothuroidea Stelleroidea sea urchin ophiura starfish sea cucumber sea lily HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

30. Interactive activity: What do you know about invertebrates? HOME HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK

31. Links HOME HOME RESOURCES ACTIVITY LINKS CONTENTS CLOSE BACK GO TO WEBSITE Virtual Worm Tour GO TO WEBSITE The Shape of Life