In the last few months, I have been searching for spiders with unique web designs. The stabilimentum serves a different function for different species of spiders. The Oval St. Andrew’s Cross Spider is a master at designing its web with an obvious warning sign. Researchers believe the X-like stabilimentum serves as a warning to prevent birds from destroying the web. 

Theories why orb-weavers have specialized web decorations 

• Stabilize the web
• Make the spider look much larger
• Disguise itself / Camouflage
• lure prey in (ultraviolet light)
• Serve as a warning sign for large birds
• An attractive piece of art/lure in a mate

Argiope aemula -X-factor

Octonoba yaeyamensis has a very unique stabilimentum. The pattern reminds me of the mysterious design the Amami pufferfish constructs to lure in the female.

What purpose does this design serve?

• Hide under the web /disguise itself
• Beautiful design to lure in a mate or insects
• Deterrent- scare off larger animals to prevent web damage

Octonoba yaeyamensis

When I first found this spider it was hiding under the stabilimentum. It serves as camouflage and protection from ultraviolet light (sunblock strand). I found it in the open sunlight on a branching leaf.

Octonoba yaeyamensis

Another strange design possibly used to attract a mate or hypnotize insects.

Cyclosa ginnaga (female)

Eriophora yanbaruensis has a simple design, possibly used to attract a mate.

Eriophora yanbaruensis

Gleaming light created this beautiful spider web prism.

Spider web prism

I have always wondered if spiders are unknown musicians. Their web has to produce some type of sound frequency. The tension of the web gently plucked by the spider or just blowing in the wind.

Do spiders use attractive frequencies to lure in insects or mates?

Spider web prism

The next step is to photograph the x-shaped stabilimentum under ultraviolet light. stay tuned to see my results.

 My Mission: To Document and Preserve the Wildlife of the Ryukyu Islands

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