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Relationship between relative MAG volume and the number of matings by queens of attine ants (Strassmann 2001, Villesen et al. 2002). The polyandrous species (Acromyrmex and Atta) have much smaller MAGs relative to their seminal vesicles than the monandrous genera (Apterostigma, Cyphomyrmex and Sericomyrmex).
