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Invertebrates

Invertebrates. Jellies – Phylum Cnidaria. Round Worms – Phylum Nematoda. Live in sediments or tissues of other organisms Over 12,000 described species (may be 500,000) Very abundant (hundreds per mL of sediment) Hydrostatic skeleton. Peanut Worms – Phylum Sipuncula.

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Invertebrates

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  1. Invertebrates

  2. Jellies – Phylum Cnidaria

  3. Round Worms – Phylum Nematoda • Live in sediments or tissues of other organisms • Over 12,000 described species (may be 500,000) • Very abundant (hundreds per mL of sediment) • Hydrostatic skeleton

  4. Peanut Worms – Phylum Sipuncula • Unsegmented marine worms • Borrow in mud, corals or empty shells • Deposit feeders

  5. Peanut Worms – Phylum Sipuncula

  6. Spoon Worms – Phylum Echiura • Exclusively marine, unsegmented • Non-retractable probiscis

  7. Segmented Worms – Phylum Annelida • Segmented worms • Gut - coelom • Hydrostatic skeleton • Longitudinal and radial muscles • Efficient locomotion and burrowing • More than 15,000 species • Cosmopolitan

  8. Segmented Worms – Phylum Annelida • Class Polychaeta

  9. Segmented Worms – Phylum Annelida • Class Polychaeta • Diverse lifestyles • Free-living predators • Often well-developed eyes and sense organs, jaws

  10. Segmented Worms – Phylum Annelida • Class Polychaeta • Diverse lifestyles • Burrowing deposit feeders • Burrowing suspension feeders

  11. Segmented Worms – Phylum Annelida • Class Polychaeta • Diverse lifestyles • Burrowing deposit feeders • Burrowing suspension feeders

  12. Phylum Mollusca

  13. Phylum Mollusca • Body Structure

  14. Phylum Mollusca • Radula

  15. Phylum Mollusca • Reproduction Trocophore Veliger

  16. Phylum Mollusca • Gastropods

  17. Phylum Mollusca • Gastropods Petropods Nudibranchs with symbiotic algae

  18. Phylum Mollusca • Bivalves • Laterally compressed • Two-valved shell • No head or radula • Gills used for suspension feeding (active) & respiration • Water enters and leaves through siphons • Some anchor to substrate with byssal threads

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