Presentation on theme: "Simple Invertebrates Sponge Sponges are asymmetrical"— Presentation transcript:
1 Simple Invertebrates Sponge Sponges are asymmetrical and do not have real tissue or organs.Cnidarians have radial symmetryand have a mouth, tentacles, muscle tissue and stinger cellsspongejellyfishSea anemonecoralhydra
2 Simple InvertebratesFlatworm -flat body, head with simple eyes, and a mouthRoundworm-simple digestive and nervous systemSegmented worm-divided into sections and has organs such as a heart, stomach, and brainFlatwormRoundworm(nematode)Segmented worm(annelids)
3 Complex Invertebrates -Mollusks Snailshave bilateral symmetrya muscular foot or tentaclemass of internal organsmost have a shellspecialized organs including heart, gills and a well-developed nervous systemSnailsclamssquid
4 Complex Invertebrates-Echinoderms have a hardened skeleton inside the body (endoskeleton)usually have radial symmetryuse a water pressure system that helps them feed, breathe and moveSea starSea urchinSea cucumber
5 Complex Invertebrates -Arthropods crabshard skeleton on the outside (exoskeleton) provides strength and protection.bilateral symmetrysegmented bodies with jointed legsefficient nervous sytem and good sensory systemscrabsinsectsspiders
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