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Fig. 5 | BMC Genetics

Fig. 5

From: Molecular cytogenetic differentiation of paralogs of Hox paralogs in duplicated and re-diploidized genome of the North American paddlefish (Polyodon spathula)

Fig. 5

Suggested main events in evolution of Acipenseriformes. S1 = split of Polyodontidae and Acipenseridae (~170 Mya); S2 = Split of Atlantic and Pacific lineage in Acipenseridae (~121 Mya); S3 = split of 2n and 4n species within Atlantic lineage (~80 Mya); S4 = Split of Polyodon spathula and Psephurus gladius (~68Mya); S5 = Split of Acipenser brevirostrum (~36 Mya). Whole genome duplication (WGD) events are: 1 = WGD specific to Polyodon spathula (60 → 120 chromosomes;~ 42 Mya [12]); 2 = WGD in Atlantic lineage (120 → 250 chromosomes; ~ 53 Mya); 3 = WGD in Pacific lineage (120 → 250 chromosomes; ~ 70 Mya); 4 = WGD specific to Acipenser brevirostrum (250 → 360 chromosomes ~ 35 Mya); D1 = the first WGD in Acipenseridae (60 → 120 chromosomes) had to take place between ~ 170 Mya and ~ 121 Mya; D2 = probable WGD (60 → 120 chromosomes) specific to Psephurus gladius. The data are based on study by Peng et al. [2] and Crow et al. [12]

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