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Developmental Changes in the Web Spinning Instinct of Uloboridae : Construction of the Primary-Type Web

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1. Uloborus begins web-weaving at an earlier developmental stage than other orb-weavers. 2. Uloborus spins the primary-type web until the first moult; after the moult it makes a normal web. 3. The primary-type web is an orb-web modification. Unlike the normal Uloborus web it lacks a viscid spiral; the temporary spiral is preserved in a completed web, and additional radii are placed besides the ordinary ones. 4. The pre- and post-moult spinning activities are similar in regard to radii, frame threads and temporary spiral placing. 5. The pre- and post-moult spinning activities differ in the performance of radial movements in place of spiral movements at the final spinning stage. 6. The change in the spinning activities takes place suddenly and is not connected with experience. 7. It is suggested that two factors are responsible for this change, one neural, the other the development of the structures, the cribellum and calamistrum.

Affiliations: 1: Dept. of Zoology, The Hebrew University, Jerusalem


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