Name:Diving bell spider, or water spiderArgyroneta aquatica)
Where it livesEurope, Central Asia and Northern Asia. A separate subspecies is found in Japan
What it eatsOther aquatic invertebrates, small fish
Why it’s awesome The diving bell spider is the only spider that lives almost entirely underwater. It still needs to breathe air though, so it survives by creating a diving bell — spinning a web between underwater plants — and then carries air from the surface down to its web via its hairy body.
“It’s developed an amazing adaption for this aquatic life,” Craig MacadamLive Science received an email from the conservation director at Buglife, a U.K.-based invertebrate charity. “The spider has many water-repellent furs on its body that trap air from the surface of the water. The spider spins silk to form an air bubble which it uses like a diving Bell.
The bubble is inflated until the spider fits inside. The chambers of The females are twice as large as the males, since they also use it as a nursery. The air is constantly refilled in the diving bell, and the water bubbles carried by the spider give it a silvery colour.
Male diving bell spiders are heavier and larger than females, which is unusual for spiders. A Study of 2003 in the journal Evolutionary Ecology Research looked at why this might be and found that for the more mobile males, growing larger — and having longer front legs — meant they could move more efficiently underwater. Females were constrained in their size by the need to build an air bell that is larger to care for the young and the energy costs of more frequently transferring air from the water’s surface to it.
Follow-up Published in 2005The Journal of Arachnology published by the authors revealed a fascinating insight into spiders mating behavior. Females seem to prefer mating large males in spite of the high risks involved.
The team found that sometimes larger males eat females, a form of reversed cannibalism. Their experiments showed that both large and small males were killed by their experiments.
Original content by www.livescience.com: “Diving Bell Spider: The only aquatic spider that creates a net to live in underwater”
Read the full article here https://www.livescience.com/animals/spiders/diving-bell-spider-the-only-aquatic-arachnid-that-creates-a-web-underwater-to-live-in