31-III DEUTEROSTOMIA Chaetognatha	Select Chapter/Biodiversity TreeHomeBiodiversity Tree1. Physics2. Chemistry3. Astronomy4. Geology5. Cell Structure6. Molecular Biology7. Photosynthesis and Respiration8. Molecular Genetics9. Mitosis and Meiosis10. Mendelian Genetics11. Populations12. Communities13. Ecosystems14. Evidence of Evolution15. Theory and Process of Evolution16. Classification Systems17. Prokaryotes18. Eukaryota19. Viridiplantae (Plants)20. Embryophyta21. Tracheophyta22. Spermatophyta23. Magnoliophyta24. Fungi25. Metazoa (Animals)26. Eumetazoa27. Bilateria28. Coelomata29. Arthropoda30. Insecta31. Deuterostomia32. Chordata33. Vertebrata34. Teleostomi35. Tetrapoda36. Sauroposida37. Aves38. Mammals39. Western/Coniferous Forests40. Taiga (Northern Forests)41. Eastern/Deciduous Forests42. Tropical Forests43. Deserts44. Polar Environments45. Tundra46. Grasslands47. Wetlands48. Freshwater Environments49. Estuaries50. Marine Environments51. Extreme Environments
	Arrow Worm (Sagitta sp.) [© Zatelmar] Chapter Outline Description of Deuterostomia Classification of Deuterostomia Chaetognatha Echinodermata Hemichordata Sources Links to external sites will appear in pop-up windows.			The phylum of Arrow Worms, Chaetognatha, contains three orders. ORDER APHRAGMOPHORA ORDER MONOPHRAGMOPHORA ORDER PHRAGMOPHORA Resources: Chaetognatha - Part of "Marine Invertebrates in the Plankton", University of Washington [ Previous Page ] [ Next Page ]