Zhu et al fig 1 (IMAGE)

PNAS Nexus

Zhu et al fig 1

Caption

Time-calibrated maximum likelihood phylogeny of 41 beetles based on 1,353 orthologs nucleotide sequences. Node when firefly lucibufagins first evolved is marked by a molecule and the most recent common ancestors of Lampyridae is marked with a firefly cartoon. Numbers over the nodes are estimated median divergence time in millions of years ago. Fossil cartoons on the nodes represent the three fossil calibrations used. The color bar located at the bottom shows historical levels of oxygen.

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Zhu et al

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