Friday, May 1, 2009

Not on Green Porno



Isabella Rossolini apparently skipped this species when she made her insect sex web series Green Porno.
A violent but evolutionarily effective mating strategy has been spotted in spiders from Israel.

Males of the aptly-named Harpactea sadistica species pierce the abdomen of females, fertilising their eggs directly in the ovaries.

The so-called traumatic insemination gives the first male to inseminate a reproductive advantage by bypassing structures in the females' genitalia. (...)

Typically, spider males deliver their genetic package via sperm that is deposited into a small web and manually inserted using a pair of appendages on their undersides known as pedipalps.

The sperm are then held in a receptacle between the ovipore and ovary known as a spermatheca until an egg is released.

However, the spermatheca is a "last in, first out" structure, so that if any further males inseminate a female, the last mate's sperm is the first in line to fertilise an egg.
Read the entire story on the BBC website.

Via Slog.

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