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Fig. 7 | BMC Evolutionary Biology

Fig. 7

From: Multiple independent chromosomal fusions accompanied the radiation of the Antarctic teleost genus Trematomus (Notothenioidei:Nototheniidae)

Fig. 7

Phylogenetic relationships within the suborder Notothenioidei with inferred ancestral karyotypes. Phylogenetic relationships of the notothenioid fish and the nototheniid sub-families and times of divergence according to recent literature [14,15,16,17,18]. Conservation of the 24 defined SUs across nototheniid species and genera allowed the reconstruction of their inferred ancestral karyotype. The reconstitution of this plesiomorphic state was based on the BAC positions on chromosomes of species in the genera Trematomus and Notothenia (underlined in blue) and the relative size of the SUs identified. In the reconstructed ancestor, all chromosome pairs are acrocentric, except for two SUs that are sub-metacentric and metacentric due to pericentric inversions acquired in the last common ancestor of the families Pseudaphritidae, Eleginopsidae, and Nototheniidae [50, 52, 53, 61]. The inferred ancestral karyotype of the sub-order Notothenioidei is composed of 24 SUs defined as acrocentric chromosomes. We acknowledge S. Iglesias and G. Duhamel (© CEAMARC and POKER surveys, MNHN), and GeShaFish (D. mawsoni, Attribution-Share Alike 3.0 Unported license) for the nototheniid photos, from top to bottom: T. pennellii, I. cyanobrancha, T. eulepidotus, P. macropterus, A. orianae, D. mawsoni

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