Organism (Scientific name) Chromosome number Picture Karyotype Notes Source Jack jumper ant (Myrmecia pilosula) 2/1 2 for females, males are haploid and thus have 1; smallest number possible. Other ant species have more chromosomes.[6] [6] Oikopleura dioica 6 [7] Australian daisy (Brachyscome dichromosomatica) 12 This species can have more B chromosomes than A chromosomes at times, but 2n=4.