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Sea squirts: Urochordata related to amphioxus and cephalochordata

Sea squirts: Urochordata related to amphioxus and cephalochordata. Diagram by Woods Hole Oceanographic Institution Hole. Filter feeding in annelids: sabellid worms. Arenicola : lugworm Polychaete Annelida. Tail toward head shaft

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Sea squirts: Urochordata related to amphioxus and cephalochordata

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  1. Sea squirts: Urochordata related to amphioxus and cephalochordata Diagram by Woods Hole Oceanographic Institution Hole

  2. Filter feeding in annelids: sabellid worms

  3. Arenicola : lugwormPolychaeteAnnelida • Tail toward head shaft • Ingests sand rich in micro-organisms and plankton left by receding tide • Every 40 min castings of sand • Tide in: stream of water driven through burrow tail to head direction current gas exchange sweeps away carbon dioxide and nitrogen; body swellings

  4. Commatulid grasping coral head on reef

  5. Commatulidae: feather starspodia originate as filter feeding devices

  6. Swimming in commatulids

  7. Mole crab

  8. Whale shark

  9. Blue whale; baleen

  10. krill

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