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Phylum Annelida

Phylum Annelida. The segmented worms. ZOOLOGY Southern Boone County High School Bill Palmer. “annelus” - little ring. TYPICAL ANNELIDS. Segmented worms Earthworms Leeches Bristleworms. ANNELIDS-Characteristics. 12,000 species Tube-within-a-tube Structure Bilateral Symmetry

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Phylum Annelida

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  1. Phylum Annelida The segmented worms ZOOLOGY Southern Boone County High School Bill Palmer “annelus” - little ring

  2. TYPICAL ANNELIDS • Segmented worms • Earthworms • Leeches • Bristleworms

  3. ANNELIDS-Characteristics • 12,000 species • Tube-within-a-tube Structure • Bilateral Symmetry • Mouth and Anus • Setae (tiny bristles) • Help annelids to move • Terrestrial, Marine, and Aquatic

  4. ANNELIDS-Characteristics • All have segments (Like stacked donuts)

  5. General characteristics • segmentedbody • each segment has paired • excretory nephridia, nerves • closed circulatory system • nervous system with double • ventral nerve cord- • ganglia for brain

  6. respire through skin or with gills • body wall with longitudinal and • circular muscle • setae/ bristles in skin • used for locomotion

  7. 3 variations in setae structure

  8. 3 classes of Annelida Class Polychaeta – mostly marine fanworms, bristle worms, tube worms Class Oligochaeta - earthworms Class Hirudinea - leeches

  9. Class Polychaeta Marine tubeworms, fanworms and bristle worms Most primitive class- have well developed anterior end (head)

  10. WOW ! lots of variety and color in marine species

  11. Setae on parapodia Marine polycheate – bristle worm

  12. Bristle worms Fleshy parapodia

  13. Ciliated feathery tentacles for feeding tube Marine fanworm

  14. Feather duster worms ( Polychaetes) Filter feeder

  15. Feather Duster worms

  16. Giant tube worms ( 4 ft long) in ocean thermal vents

  17. Calcareous (limestone) tubes of marine annelids

  18. Earthworms are important Food chains Aerate soil

  19. Bloodworm - Marine species Lives in mud at ocean bottom Great fishing bait!

  20. Polychaeta worm larva – pelagic ( planktonic ) Branching nerves

  21. Polychaete larva

  22. Class Hirudinea the leeches parasites

  23. Segmentation evident Suction disk Leech

  24. Leech

  25. Leech 3 pairs of eyes

  26. Class Oligochaete The earthworms plus some freshwater species

  27. Flatworm meets Annelid Crime scene Scotland

  28. Earthworm gathering

  29. Fossil Polychaete worm Bristles and segmentation evident

  30. Spriggina fossil Precambrian segmented invertebrate Segmented body ( metamerism )

  31. Trochophore larva- typical of some annelids Mollusca phylum also has trochophore Larvae… suggesting related evolution

  32. Wrap-ups • How many species of annelida are there? • What are the characteristics of annelida? • What are the three classes of annelida? • List three reasons why earthworms are important. • How are leeches used in medicine?

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