Fig. 4.

Fig. 4. Reconstruction of the evolution of post-coelomic diverticula within the Pristigasteridae. Ancestral conditions [no post coelomic extension (white), paired post-coelomic extensions (black) and single post coelomic extension (green)] at nodes reconstructed using a maximum likelihood method of ancestral character inference under the model “Mk1.” Pie charts show likelihood support for ancestral habitat states (sum = 1) for the corresponding nodes. Note that the phylogenetic position of Chirocentrodon bleekerianus sister to Ilisha africana is not supported and additional data are needed to confidently resolve it. Classification is revised according to our results (see DISCUSSION).