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On the subject of mysterious absences...
If I may weigh in on a related issue, I've noticed another thing that would
seem to be missing from Mesozoic times.
Today's marine mammals usually include a variety of small toothed forms
along with filter-feeding varieties. Filter feeders actually tend to account
for the largest animals in just about any oceanic environment you find
Yet in the Mesozoic, even the biggest pliosaurs, mosasaurs, ichthyosaurs,
etc. are still toothy. Where are all the "baleen kronosaurs" that ought to