GEL 107 (17)

GEL 107 (17) - GEL107: PALEOBIOLOGY What are the major...

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1 GEL107: PALEOBIOLOGY Lecture 18: Invertebrates Which invertebrate groups are most closely related to vertebrates? What are vertebrates? What are the “major” groups of invertebrates and how are they related with each other? Metazoa (animals) Sponges Cnidarians Bilaterians Vertebrates non-vertebrate bilaterians Invertebrates Vertebrates Metazoan phylogeny Metazoa Eumetazoa Bilateria Dueterostomia Protostomia Ecdysozoa Lophotrochozoa Metazoan phylogeny Metazoa Porifera Spicules water flow 2 loose layers of cells Needle-like structures Sponges (Porifera)
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2 Archaeocyatha Sponges (Porifera) Stromatoporoid Sponges (Porifera) ht p:/ www.geo.edu.ro/~sedim/Stratigrafie/Stromatoporoidee.html Metazoan phylogeny Metazoa Cnidarians Eumetazoa Cnidarians Sea anemone Coral Jellyfish True tissues Nematocytes – stinging cells Tentacles Radially symmetric Hydra Cnidarians ht p:/ bio1152.nicerweb.com/doc/class/bio1151/Locked/media/ch33/33_05PolypMedusa.jpg Rugose Coral Cnidarians ht p:/ www.uky.edu/OtherOrgs/KPS/images/coralsilicx.jpg
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GEL 107 (17) - GEL107: PALEOBIOLOGY What are the major...

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