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26.1 Invertebrates

26.1 Invertebrates. The First Animals. Choanoflagellate - animal ancestor (single celled). Choano -flagellates formed colonies, may have evolved into sponges (1 st animals). All life was single-celled for over 3 billion years!.

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26.1 Invertebrates

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  1. 26.1 Invertebrates The First Animals

  2. Choanoflagellate - animal ancestor (single celled)

  3. Choano-flagellates formed colonies, may have evolved into sponges (1st animals)

  4. All life was single-celled for over 3 billion years!

  5. Trace fossils - reveal “tracks and burrows” of first animals (600 million years ago)

  6. 1st animals came before Cambrian explosion. Ediacara Animals - 565-544 MYA - no specialized tissue - different body plans - no organization - wormlike, lived at bottom of shallow water

  7. Cambrian Explosion - 530-515 MYA - rapid appearance of most animal phyla

  8. Cambrian Explosion - Animals developed: - complex body plans - specialized tissue - symmetry, segmentation - appendages - limbs or antennae

  9. Cambrian explosion = great oxygenation?

  10. Invertebrates = most abundant on Earth

  11. Use pages 754 to 756 in text to answer the rest of 26.1 workbook

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