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There was a taxonomic revolution brought about by cladistics https://en.wikipedia.org/wiki/Cladistics. Willi Hennig wrote about it in 1950, but he was an East German, and his work did not gain traction in the West until it was translated into English in the late 1960s. Then it took a while to become consensus. Since then, all taxonomy is based on ...


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It's fairly common. It is believed to have evolved two times independently, basically in both groups presumed to use their tails as weapons. Both Diplodocoidea and Euhelopodidae have species with forked chevrons and evolved it independently. It is fairly diagnostic since it is not seen outside these groups. Source Independent half chevrons (two rows of ...


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As of right now it is still the same, the evidence for sauropodomorpha being a outgroup is not statistically more reliable, this may change, however this will still not have much impact. There are several ways in which dinosauria is defined. The most recent common ancestor of Megalosaurus and Iguanodon is also sometimes used since they were the original ...


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late Maastrichtian is probably it. Part of the problem you are running into is the Triceratops genus is in flux, there is debate about whether certain species belong in the genus. Such as whether triceratops and torosaurus are the same species. The other problem you are running in to is the accuracy of dating methods, many fossils are dated indirectly, ...


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Several models have been proposed, challenged, and revised over the past two decades: Origin of Flight: Could ‘four-winged’ dinosaurs fly?, Nature (2005) A previously published reconstruction shows that the hindwing of Microraptor supported by a laterally extended leg would have formed a second pair of wings in tetrapteryx fashion. However, this wing ...


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