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Maximum-likelihood phylogenetic tree based on 13 concatenated mitochondrial genes from 20 hydrozoa species. The scyphozoan Acromitus flagellatus and Nemopilema nomurai were used as outgroups. The Monoserius pennarius is highlighted in red box. Numbers at nodes indicate bootstrap values. The tree was constructed using IQ-TREE with 5000 ultrafast bootstraps replicates and visualized using iTOL (https://itol.embl.de/).
