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Re: marine reptile McMenu

"[...] Krill have no fossil record, so very little is known about their palaeobiology. The timing of past speciation events
in krill was estimated by comparing change in their 28s rDNA to change in the 28s rDNA of their close relatives
that do have a fossil record. [...]"

Ah. Using only external calibration points leads to too old divergence date estimates.