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Name: Diving spider or water spider (Aquatic Argyroneta)
Where you live: Europe and central and northern Asia, with a separate subspecies in Japan
That eats: Other aquatic invertebrates and small fish.
Why it’s amazing: As its name suggests, the diving bell spider lives almost entirely underwater; It is the only spider that does so. However, it still needs to breathe air, so it survives by creating a diving bell (weaving a web between underwater plants) and then transporting air from the surface to its web through its furry body.
“It has developed an amazing adaptation for this aquatic life,” Craig Macadamhe told LiveScience in an email. “The spider has numerous water-repellent hairs on its body, which trap air from the surface of the water. The spider then weaves a silk structure where it forms an air bubble, which it uses in the same way as a diving bell. “.
The bubble expands until the spider can fit inside. the cameras of Females are twice as large as males., since they need it to also serve as a nursing room. The air in the diving bell is periodically renewed and the spider carries with it a water bubble that gives it a silvery color.
Unusually for spiders, male diving spiders are larger and heavier than females. TO 2003 study in the journal Evolutionary Ecology Research looked at why this might be the case and found that for more mobile males, growing larger (and having longer front legs) meant they could move more efficiently underwater. In contrast, the size of females was limited by the need to construct a larger air hood in which they cared for their young and the energetic costs associated with more frequent transfer of fresh air from the water surface to the Campaign.
A tracing study published in 2005 in The Journal of Arachnology by the same authors also revealed an interesting idea about spider mating behavior: females seem to prefer mating with large males, despite the great risks involved.
The team found that larger males occasionally eat females in a case of reverse sexual cannibalism. However, their experiments also showed that large males and females would also kill small males.