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Water Spider Facts, Diet, Habitat & Information

Water Spider facts and knowledge. Know Water Spider weight loss plan, habitat, behaviour taxonomy, and so forth See fascinating facts of Water Spider in our animal facts archive.

Scientific identify: Argyearoneta aquatica
Scientific classification:
Phylum: Arthropoda
Class: Arachnida
Order: Araneae
Family: Agyearonetidae

What does it appear to be? The water spider out of water is a quite drab specimen. It has a mousy, darkish gray stomach. The physique of a completely grown feminine is between eight and 15 mm lengthy, though specimens 20 mm lengthy are identified. Males are between 9 and 12 mm lengthy. 

Where does it reside? This spider is extensively distributed all through Europe and northern Asia, and the place it happens it may be typically be present in fairly giant numbers. It prefers swimming pools of water quite than streams and rivers, and it may be present in lakes, ponds, and ditches.


Spiders, with their eight legs, powerful little our bodies, and skill to make webs and different silken constructions are nearly archetypal land lubbers—or so you'd assume. There is one spider, the water spider, which has moved from the land and again to the ancestral dwelling of all life: the water.

This wonderful and barely seen animal has retained the flexibility to produce silk from its again finish, and within the aquatic atmosphere, it has put this talent to excellent use. In the sheltered confines of a pond or maybe a big ditch, the spider spins what appears to be like like a silken balloon anchored to stems of aquatic vegetation. To the underwater observer this construction is mysteriously silver, like an imperfect sphere of mercury suspended within the water.

The silvery impact is definitely due to the presence of air. The little, tightly woven silk balloon is definitely a neat diving bell, and it's on this silvered chamber the spider resides. Like a traditional, land-dwelling, web-building spider, this species spends a lot of it time within the confines of its retreat, drawing on its provide of air and ready for a tasty snack to swim or drift by.

The water spider is a reasonably large spider, and with its potent venom, it may possibly subdue animals as giant as tadpoles—dashing out from its retreat to ship a lethal chunk.

A diving bell underwater is all properly and good , however how on earth does this animal replenish its provide of air? It’s not as if it has a help ship on the floor piping oxygen down to it. Each time one in every of these spiders builds a diving bell, it should ascend to the floor and acquire air underneath the hairs that dress its stomach and legs. Enshrouded it what seems to be a swimsuit of quicksilver, the spider descends to its bell and wipes the air from its physique into the bell. As quickly because the bell is full, it's a self-replenishing air provide. Oxygen from the encompassing water percolates in to the bell giving the arachnid a autonomous, underwater respiration equipment.

Even extra fascinating is the way in which these animals go about mating. An ardent male comes alongside and, with out a care for private area, builds a diving bell proper subsequent to that of a mature feminine. If this weren't presuming sufficient, he then proceeds to construct a small tunnel connecting the 2 bells. Seemingly, the feminine is impressed by the male’s conduct, and he breaks by the wall into her bell the place the 2 mate.

The feminine lays between 30 and 70 eggs in her diving bell, and the spiderlings that finally hatch will go away this refuge and seek for habitat of their very own, traversing land the place they've to.

Key Facts

  • Of all of the spiders, the water spider is the one species that has taken to an aquatic existence. There are different spiders which can be semiaquatic, dwelling on or round water. One such instance is the raft spider. These large, spectacular wanting spiders can transfer round on the meniscus of small our bodies of water, particularly the place there's plentiful vegetation to act as a base for his or her rafting actions. They use the floor movie of the water as a kind of internet, detecting faint ripples of prey beneath the floor. They plunge by the meniscus and seize the prey. They are giant sufficient to subdue small fish and amphibians.
  • Although the water spider spends its life in an aquatic atmosphere, it should nonetheless breathe air. Truly aquatic animals can extract the oxygen in water by the constructions often known as gills. Technically, the diving bell of the spider acts like a gill as oxygen diffuses into it from the encompassing water.
  • The water spider can use its lengthy legs to swim freely within the water whereas on its looking forays.
  • Although the water spider is sort of large and has highly effective fangs, strong sufficient to pierce human pores and skin, they're eaten by fish and frogs. The typical prey of this spider is the larvae and nymphs of varied aquatic bugs and crustaceans. The captured prey of the spider is taken again to the diving bell the place it's consumed.
  • Uncharacteristic for a spider, male diving spiders are the identical measurement or bigger than females. This reverses the conventional state of affairs of a male spider tentatively approaching a feminine when it comes to mating. In water spiders it's the feminine who have to be cautious of the male, for he's sufficiently big to overpower and kill her.
  • The water spider is likely one of the solely spiders in Europe that has a chunk that may be thought-about to be even remotely harmful. The chunk is painful and the signs of itching, shivering, vomiting and fever can final for so long as three days.