Neighbour-joining phylogenetic tree obtained with concatenated sequences of six housekeeping genes (rpoD, gyrB, gyrA, recA, dnaJ and dnaX, 3558 bp) showing position of four new Aeromonas spp. (bold) relative to 32 Aeromonas spp. Numbers at nodes represent bootstrap percentages obtained by repeating analysis 1000 times. Scale bar = 0.01 estimated substitution per site. In silico DNA-DNA hybridization (isDDH) represents genetic similarity obtained between genome of each of four new species and genomes of their closest neighbour species.