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BackgroundPhorid flies are amongst the most biologically diverse and species-rich groups of insects. Ways of life range from parasitism, herbivory, fungivory, to scavenging. Although the lifestyles of most species are unknown, many are parasitoids, especially of social insects. Some species of ant-parasitoids are attracted to injured hosts for feeding purposes to develop eggs, as well as for oviposition, requiring each female to find two injured hosts.New informationFemales of the phorid fly    Megaselia   steptoeae    Hartop et al. (  Diptera  :   Phoridae  ) were found to be quickly attracted to crushed glass snails of the species    Oxychilus   draparnaudi    (Beck) (  Gastropoda  :   Oxychilidae  ). Most females were without mature eggs and apparently were attracted for feeding purposes only; other injured molluscs offered at the same time were not attractive. One female laid eggs in captivity and offspring were reared to the pupal stage. The lifestyle of this species is similar to that of parasitoids of injured ants, which also require separate hosts of the same species for feeding and oviposition. We conclude that injured hosts must be common in the environment to attract these host-specific scavengers.

Megaselia steptoeae ( Diptera : Phoridae ): specialists on smashed snails