Sea Worms

Sea Worms PowerPoint PPT Presentation


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Sea Worms. Worms have sensory tissue at one end of the body (a head)They also have simple digestive and excretory systems to circulate nutrients and eliminate wasteSome are parasitic, while others bury under rocks or roam the bottom of the sea. Phylum Platyhelminthes. AKA flatwormsSome are parasitic (like tapeworms of marine and land animals)Are smaller than 3 cm in length and can be found hiding under rocksThey have a central nervous system that is stimulated by eyespots They lack a true 33843 - PowerPoint PPT Presentation

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Sea Worms

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1. Sea Worms Includes three Phyla:Annelida (segmented worms), Platyhelminthes (Flatworms), and Nematoda(Roundworms) These phylum start to get more complex Worms have bilateral symmetry

2. Sea Worms Worms have sensory tissue at one end of the body (a head) They also have simple digestive and excretory systems to circulate nutrients and eliminate waste Some are parasitic, while others bury under rocks or roam the bottom of the sea

3. Phylum Platyhelminthes AKA flatworms Some are parasitic (like tapeworms of marine and land animals) Are smaller than 3 cm in length and can be found hiding under rocks They have a central nervous system that is stimulated by eyespots They lack a true respiratory system and excretory system but they diffuse gases and wastes through their surface

5. Phylum Nematoda AKA roundworms First animals in the animal kingdom that possess a flow through digestive system (a digestive tract with a mouth and anus) There are 12 000 known species Large populations in shallow, soft sediments

7. Phylum Annelida The most familiar worm – the earthworm Most advanced worms They are the segmented worms and include the earthworm These worms have muscular, reproductive, nervous, circulatory and digestive and excretory systems The most important marine worms are the class Polychaeta

8. Feather duster Worm

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