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Exploring Marine Organisms: Sponges, Jellyfish & Worms in Intertidal Zones

Dive into the fascinating world of intertidal organisms including Phylum Porifera, Phylum Cnidaria, and assorted worm phyla. Learn about sponge feeding mechanisms, jellyfish body forms, and worm feeding habits. Discover the diversity and unique features of these creatures found in the marine ecosystem.

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Exploring Marine Organisms: Sponges, Jellyfish & Worms in Intertidal Zones

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  1. Marine Ecology, April 7 & 9, 2008 Intertidal organisms Part A: Phylum Porifera, Phylum Cnidaria, and assorted worm phyla

  2. Phylum Porifera • Basic sponge knowledge • Water movement and feeding • Focus on the choanocyte • Protection in sponges • Spicules • Toxins • Cryptic location • Camouflage • Regnerative ability

  3. Haliclona sp. Nudibranch: Many are predators of sponges

  4. Phylum Cnidaria • Polyps and medusae • Basic parts of both body forms

  5. Phylum Cnidaria • Alternation of generations • Note that anemones have no medusa form, but do have functional gonads within polyps

  6. Phylum Cnidaria • Cnidocytes/nematocysts

  7. Anthopleura xanthogrammica Anthopleura elegantissima Phylum Cnidaria, Class Anthozoa Local intertidal species

  8. Anthopleura artemesia Epiactis prolifera Phylum Cnidaria, Class Anthozoa Local intertidal species

  9. Phylum Platyhelminthes • Overall body organization

  10. Marine Platyhelminthes

  11. Phylum Nemertea

  12. Phylum Nematoda:The roundworms

  13. Phylum Annelida • Overall body organization

  14. Phylum Annelida, Class Polychaeta • Free-crawling predators Family Nereidae Family Glyceridae Photos: Morris et al.

  15. Phylum Annelida, Class Polychaeta • Free-crawling predators Family Nereidae: mouthparts

  16. Phylum Annelida, Class Polychaeta • Tube worms with tentacular crowns Family Sabellidae Photo: coralsphere.com Family Serpulidae Photo: Taata Divers

  17. Phylum Annelida, Class Polychaeta • Family Sabellidae

  18. Phylum Annelida, Class Polychaeta • Deposit feeders Family Terrebellidae

  19. Phylum Annelida, Class Polychaeta • Tube-dwelling, mucous-bag feeder (Chaetopterus) Photo: Erling Svensen Family Chaetopteridae

  20. Phylum Annelida, Class Polychaeta • Tube-dwelling, mucous-bag feeder (Chaetopterus) Photo: Erling Svensen

  21. Epitokes! • What are the key physical features of epitokes? • How/when are they formed? • Describe their behavior

  22. Trocophore larva Photo: NOAA

  23. Phylum Sipuncula Sketch from Invertebrate Zoology course; UC Santa Cruz, Professor Baldo Marinovic

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