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Marine Vertebrate Zoology Vertebrate Ancestry How did it all begin?

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Presentation on theme: "Marine Vertebrate Zoology Vertebrate Ancestry How did it all begin?"— Presentation transcript:

1 Marine Vertebrate Zoology Vertebrate Ancestry How did it all begin?

2 Vertebrate Ancestry 2 Invertebrate Origin  A great division in the invertebrate world occurred creating two distinct evolutionary lines: Early Invertebrate First Branch - Annelids - Molluscs - Arthropods Second Branch - Bryozoans - Brachiopods - Echinoderms - Chordates (hydra? sea anenome?)

3 Vertebrate Ancestry 3 Invertebrate Origin Deutrostome Protostome

4 Vertebrate Ancestry 4

5 5 Chordates  Characteristics of all chordates: 1.Notochord 2.Hollow nerve cord 3.Pharyngeal gill slits 4.Post anal tail

6 Vertebrate Ancestry 6 Phylum Chordata  Subphylum Hemichordata Acorn worms  Subphylum Urochordata Tunicates  Subphylum Cephalochordata Amphioxus (Lancelets)  Subphylum Vertebrata Fishes, amphibians, reptiles, birds, and mammals

7 Vertebrate Ancestry 7 Geological Record  Our understanding of taxonomy and systematics and the appearance of life on earth is based upon fossil remains.  To grasp the magnitude of the geological record it is divided into Eras, which are divided into periods, and divided further into epochs Paleozoic600 - 280 million years Mesozoic225 - 136 million years Cenozoic 65 million years - to the present

8 Vertebrate Family Tree **

9 Amphibians

10 Reptiles & Birds

11 Mammals


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