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Comment Re:The real extinction (Score 1) 93

I think a better measure here is extinction at the genus level. Genuses are more likely to have fossil records and we can speak of the relative decline of the number of genuses in a proposed extinction event.

Exactly. Mass extinctions are measured by the % loss of genera, not a species count.

(Along those same lines, very few people can name more than one dinosaur species, but they can name several genera.)

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