Fig. 5

Comparison of chromosomal fusions in the genera Trematomus and Notothenia. A subset of BAC-defined SUs was used to characterize chromosomal fusion (cfu: centric fusions, tfu: tandem fusion). Each distinct SU is represented by a unique color. Orthologous SUs are labeled by the same color. aTrematomus species. Independent chromosomal fusions were observed in the five species shown. The asterisks indicate when male (chromosomal formulae: 2n-1). The green SU was found in the heteromorphic Y sex chromosome in males in T. newnesi, which corresponds to the X1 or X2 sex chromosome in females. T. borchgrevinki and T. hansoni were represented only by females in this study (Additional file 2). bNotothenia species. BAC pair 28D21 (green signal) and 44 M14 (red signal), which label different SUs (Additional file 1), revealed that orthologous SUs formed the same metacentric pair in the three Notothenia species (cfu1 = shared fusion). Abbreviations: cfu; centric fusion; tfu, tandem fusion. Scale bars: 10 μm