 However, ones successful in finding a mate make up for the losses by producing twice as many female offspring as their competitors.The ant species Myrmecia impaternata is female-only, with its hybrid origin tracing back to Myrmecia banksi and Myrmecia pilosula.In ant species, sex is determined by the haplodiploidy system where unfertilized eggs result in haploid males and fertilized eggs result in diploid females.