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The Amorous Appetites of Adolescents and Arachnids: Sexual Cannibalism in the Australian Redback Spiders (Latrdectus Hasselti)

Description: Some females, however, embrace this dark fantasy with wide-open chelicerae. For example, female Australian redback spiders (Latrdectus hasselti) routinely devour their complacent lovers during copulation. Not only are males completely nonresistant to female attack, but they also heedlessly tempt the female beast by performing a backward somersault during copulation. This maneuver places his plump opisthosoma in a vulnerable position, right in front of the mouth of his insatiable mistress. More often than not, she accepts his masochistic offer and proceeds to consume him during their carnal act. The potential fitness benefit of sexual cannibalism is obvious for the female. Nutritional gain due to mate consumption can significantly increase her fecundity. However, the effect on male fitness is less readily apparent since male sacrifice results in the forfeiture of all future mating opportunities. Therefore, the persistence of sexual cannibalism in Australian redback spiders poses two evolutionary questions: Does sexual cannibalism represent a conflict of interest between the sexes or can male Australian redback spiders somehow benefit from sexual suicide?
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