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Simple Invertebrates Sponge Sponges are asymmetrical and do not have real tissue or organs. Cnidarians have radial symmetry and have a mouth, tentacles,

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Presentation on theme: "Simple Invertebrates Sponge Sponges are asymmetrical and do not have real tissue or organs. Cnidarians have radial symmetry and have a mouth, tentacles,"— Presentation transcript:

1 Simple Invertebrates Sponge Sponges are asymmetrical and do not have real tissue or organs. Cnidarians have radial symmetry and have a mouth, tentacles, muscle tissue and stinger cells sponge jellyfish Sea anemone hydra coral

2 Simple Invertebrates Flatworm -flat body, head with simple eyes, and a mouth Roundworm-simple digestive and nervous system Segmented worm- divided into sections and has organs such as a heart, stomach, and brain Flatworm Roundworm (nematode) Segmented worm (annelids)

3 Complex Invertebrates -Mollusks Snails have bilateral symmetry a muscular foot or tentacle mass of internal organs most have a shell specialized organs including heart, gills and a well-developed nervous system Snails clams squid

4 Complex Invertebrates-Echinoderms have a hardened skeleton inside the body (endoskeleton) usually have radial symmetry use a water pressure system that helps them feed, breathe and move Sea star Sea urchin Sea cucumber

5 Complex Invertebrates -Arthropods crabs hard skeleton on the outside (exoskeleton) provides strength and protection. bilateral symmetry segmented bodies with jointed legs efficient nervous sytem and good sensory systems insects spiders crabs


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