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Mating generally occurs after individuals reach adulthood. In many arthropods including spiders, the adult stage is marked by a final moult after which the genitalia are fully developed and functional. In several widow spider species (genus Latrodectus), however, immature females may mate a few days before they moult to adulthood, i.e. in their late-subadult stage. While the "adult" mating typically results in cannibalism, males survive the "immature" mating. During both "immature" and "adult" matings, males leave parts of