The 'Banana Spider' builds massive webs to outsmart thieves
In short: The golden silk orbweaver is an architectural marvel of the forest. Females can construct webs up to seven feet wide, featuring specialized barrier webs to ward off predators and off-center hubs designed to protect their food from kleptoparasitic thieves.
The Trichonephila clavipes, commonly known as the golden silk orbweaver or 'banana spider,' is a master of silk engineering. While many orb weavers rebuild their webs daily, the female Trichonephila clavipes produces a large, golden-colored web that can reach up to seven feet in diameter. To ensure its survival, the spider constructs one or more 'barrier webs' alongside the main structure to provide a defensive perimeter against predators. This architectural strategy allows the web to last longer than those of most other orb-weaving species.
The spider's hunting strategy involves a sophisticated spatial arrangement. It catches small flying insects like flies, beetles, and moths, then wraps the prey and brings it back to a hub that is typically positioned off-center. This specific placement is believed to be a defensive mechanism to reduce theft by the kleptoparasitic Argyrodes, a spider that steals food from others. Unlike some related species that immobilize prey by wrapping them in silk first, T. clavipes primarily incapacitates its catch by biting it with venom.
Beyond its defensive tactics, the species is a subject of significant scientific interest due to its unique genetics. It was the first orb-weaving spider to have its genome completely annotated, revealing 28 unique genes for spidroins—the proteins that make up spider silk. Studies indicate that T. clavipes silk could assist during intricate clinical operations, including neurological procedures. In North Carolina, these spiders are common in moist forests and coastal plains, where they mature through the summer and fall months.
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Sources
- Summary by Intellect · source: Spiders of North Carolina
- Also: Trichonephila clavipes
- Also: iNaturalist — Golden Silk Spider (Trichonephila clavipes) · CC BY-SA 4.0 (Wikipedia summary)
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