Nursery Web Spider (Pisaura mirabilis)

The Nursery Web Spider is a spider species of the family Pisauridae. It grows to about 15mm and they are active hunters that search for prey amongst grasses and low vegetation.

Males of this species offer a nuptial gift to potential female mates. Some have also been observed to use thanatosis (feign death) during courtship. After presenting the nuptial gift to the female, she bites on the gift and the male moves to her epigyne to deposit sperm with his pedipalps.

Throughout copulation the male keeps a leg on the gift so as to be ready if she tries to escape with it or attack him.

Thanatosis in Pisaura mirabilis has been observed to significantly increase the male's odds of successfully copulating.

The female carries her large eggs sac beneath her body, held in the jaws. Prior to the spiderlings hatching, she fixes it to some plants and spins a silken tent around it and then stands guard.

As only one species of this genus is present in northern Europe, this spider is unmistakable.

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Nursery Web Spider (Pisauridae)

Nursery web spiders are spiders of the family Pisauridae. They resemble wolf spiders (family Lycosidae), but they carry their egg sacs by means of their jaws and pedipalps (instead of attaching them to their spinnerets). When the eggs are about to hatch, a mother spider will build a nursery "tent", put her egg sac inside, and mount guard outside. The namenursery web spider is especially given to the European species Pisaura mirabilis, but the family also includes fishing spiders and raft spiders. Unlike the wolf spiders, which have two very prominent eyes in addition to the other six, the eyes of the nursery web spiders are more or less the same size. Many species are able to walk on the surface of still bodies of water, and may even dive beneath the surface for a time to escape enemies. In escaping predators, they may very well jump a distance of five or six inches. However, they do not find it easy to make their way up extremely smooth surfaces such as glass. The female spider will sometimes attempt to eat the male after mating. The male, to reduce the risk of this, will often present the female with a gift such as a fly when approaching in the hope that this will satisfy her hunger, and sometimes this gift is a fake present intended to fool the female.

Ref: http://en.wikipedia.org/wiki/Nursery_web_spider