The reason that adaptation in Argyroneta aquatica for storing air underwater is advantageous over having gills. Introduction: The diving bell spider ( Argyroneta aquatica ) lives inside the water. It is dark brown in color, but the presence of hair on the abdomen makes it appear dark gray. It breathes air like other spiders. The air gets trapped by the dense hair on its abdomen and legs. This helps in breathing under water. The trapped air gives a silvery appearance. The diving bells are irregular sheets of silk and protein-based hydrogel. It allows the diffusion of gases but do not allow water to go through. The net diffusion of oxygen in and carbon dioxide out is maintained by the spider.

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Chapter 42, Problem 13TYU

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To explain: The reason that adaptation in Argyroneta aquatica for storing air underwater is advantageous over having gills.

Introduction: The diving bell spider (Argyroneta aquatica) lives inside the water. It is dark brown in color, but the presence of hair on the abdomen makes it appear dark gray. It breathes air like other spiders. The air gets trapped by the dense hair on its abdomen and legs. This helps in breathing under water. The trapped air gives a silvery appearance. The diving bells are irregular sheets of silk and protein-based hydrogel. It allows the diffusion of gases but do not allow water to go through. The net diffusion of oxygen in and carbon dioxide out is maintained by the spider.

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