my list:
From: dinosaur-l-request@usc.edu <dinosaur-l-request@usc.edu> on behalf of tharonyx <john-schneiderman@cox.net>
Sent: Saturday, February 8, 2020 5:06 PM To: dinosaur-l@usc.edu <dinosaur-l@usc.edu> Subject: [dinosaur] 3 things the public needs to know about Dinosaurs
How many non-avian dinosaur species existed? Figuring just the Mesozoic (251-65 my), average “lifespan” for species is about 1 my., number of species at any moment as about for a specific class is about 4,000-8,000 species. So my estimate is about 500,000 to 1,000,000 species of non-avian dinosaurs existed during the whole of the Mesozoic. Of which only 1,250 valid species (0.125%-0.250%) have been discovered. Toss in avian-dinosaurs and include the Cenozoic and you get at least 1,500,000 species! That’s a lot of Dinosaurs!!!
John Schneiderman John-schneiderman@cox.net
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