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Summary: The diploid chromosome number in the female formicine ant, Lasius sakagamii, is 30, while the haploid number in normal males is 15. Six of the 30 studied colonies (20%), however, contained many diploid males. Although the body size of the diploid males was, on average, larger than that of the haploid males, both types of males showed normal external and internal morphologies. Furthermore,...
Australian ants of the Myrmecia pilosula species complex include some individuals (in M. croslandi) with the lowest possible metazoan chromosome number of 2n = 2. Others in this cluster of sibling species have much higher numbers, the known maximum being 2n = 32. Two species (M. pilosula and M. ′banksi′) are believed on cytogenetic and morphological grounds to have hybridized over a long period. To...
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