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Phylogeny of the genus Hydra. (A) RAxML phylogeny of Hydra and other metazoans. Dating estimates are provided for each node. (B) Branching pattern and divergence within the genus Hydra. Age estimates in black are from this study, those in blue are from ref. 7, and those in red are from refs. 14 and 24. Bar charts on the right indicate proportions of the major repeat element classes in each species. Genome sizes are from refs. 25 and 26.
