Pisaurina dubia, commonly known as the nursery web spider, is a species of spider belonging to the family Pisauridae. It is found in North America, particularly in the eastern and central regions. These spiders are known for their unique reproductive behavior, where the female constructs a nursery web to protect her eggs and young spiderlings until they are ready to disperse. They are typically brown or gray in color and have long legs, making them excellent hunters both on land and in water.