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Animal origins: metazoans, Ediacaran fauna, the Burgess fauna

Animal origins: metazoans, Ediacaran fauna, the Burgess fauna

Animal origins: metazoans, Ediacaran fauna, the Burgess fauna

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Genus: Hallucigenia sparsa<br />

An onychophoran ("velvet Worm")<br />

Arthropods of <strong>the</strong> <strong>Burgess</strong> Shale<br />

• Arthropods comprise 40% of <strong>the</strong> known fossils in <strong>the</strong><br />

<strong>Burgess</strong> Shale<br />

• They are characterized by segmented bodies,<br />

multiple-paired appendages, well-developed head,<br />

thorax and tail, extensive sensory and feeding<br />

structures<br />

• Skeletons are chitinous with varying amounts of<br />

organic matter and CaCO 3<br />

<strong>Burgess</strong> Shale Trilobites<br />

Genus: Marrella splendens<br />

A primitive Trilobite-like Arthropod

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