Ostracoderms - PowerPoint PPT Presentation

The Integument

The Integument. INTEGUMENTARY SYSTEM. Epidermis. I. Two Types A. Invertebrate type - epidermis plus basement membrane - protochordates B. Vertebrate type complex dermis + epidermis Trends - thin in anamniotes thick in amniotes. Basement Membrane. Epidermis. Dermis. Leptoid Scale.

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Ordovician Period

Ordovician Period. 488-444 million years ago. 460 mya - Eurypterids Appear 450 mya – Chondrichthyes 444 mya – Mass extinction. 460 million years ago. Eurypterids Appear “Sea Scorpion” Largest arthropod to ever live (2 meters or 6 feet long) Predator of the sea.

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