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| | All The Dinosaurs That Lived (Site not responding. Last check: ) |
 | | The 775 genera are all the distinct dinosaur genera based on fossil body parts, from well founded to highly dubious, including nomina nuda, that I have come across in a 25-year search of the literature. |
 | | I estimate on the order of 50,000 dinosaur genera and up to half a million individual species populated the Mesozoic from the Middle Triassic through the end of the Cretaceous, a period of time longer than 160 million years. |
 | | Altogether, I estimate several thousand dinosaur genera were alive at any one time during the Mesozoic (but only about a hundred or two of the big dinosaurs), which is entirely in line with estimates for extant mammals, birds, and reptiles. |
| www.dinosauria.com /jdp/dino/num.htm (352 words) |
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