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  • Title: Evolution: sex and cannibalism in redback spiders.
    Author: Gage MJ.
    Journal: Curr Biol; 2005 Aug 23; 15(16):R630-2. PubMed ID: 16111935.
    Abstract:
    Female redback spiders cannibalise mating males. New research has shown they have evolved two separate sperm storage organs, allowing them to make post-copulatory paternity choices. Counter-adaptation by males, to maximise paternity after cannibalism, has led to the evolution of an abdominal constricting mechanism, which enhances short-term survival and mating success after attack by the female and maximises the chances of inseminating both sperm storage sites.
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