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Water Spider  
  Megadolomedes australianus
  Family: Pisauridae  ID: Koch, 1865

The Water or Nursery Spider (seen here on the side of a tree) can walk across the surface of water and can also dive underwater, where it catches aquatic insects, tadpoles and even small fish.
Water Spider (Pisauridae)
Water Spider (Pisauridae)
Water (or Nursery) Spider
Water Spider (Pisauridae)
Water Spider, B/W illustration

© Museum Victoria Australia