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Need for speed.(Samplings)(Brief Article)

Natural History

| June 01, 2004 | Reebs, Stephan | Copyright American Museum of Natural History Dec 2008/Jan 2009. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)Copyright

Here's a consummately unequal partnership for you: male cobweb spiders (genus Tidarren) weigh in at only about 1 percent the weight of the females. Not surprisingly, that creates a few problems.

The male has two copulatory organs known as pedipalps, and either one can make him a dad. To do the job properly, each pedipalp has to be enormous, relative to the rest of his body. Sure enough, the two make up about 20 percent of his body weight--more, apparently, than he's willing to carry around. So, just before molting into his adult form, the male Tidarren half-emasculates himself. He spins a silk structure, ties it around one--just one--of his pedipalps, and then twists…

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