What is the structural characteristic of the dense, opaque silk pattern found vertically in the center of the orb web?
Answer
Zigzag pattern
The most distinctive physical output associated with the writing spider is the stabilimentum. This structure consists of a dense arrangement of thicker, opaque silk woven into a prominent zigzag pattern running vertically down the middle axis of the circular orb web. Research suggests this pattern is often constructed after the main circular structure is finished, indicating it provides little actual structural stability to the overall design. Its function is debated, potentially serving as camouflage, a prey attractant via UV reflection, or a visible marker to deter avian predators from flying through and destroying the intricate web.
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