Please use courtesy links: Species Lost and Found.
I don't see a reason why it should be split either.
And this would be TRS work.
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I don't think that merely reorganizing the examples is something that actually requires TRS.
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I believe TRS is about renaming, merging, and cutting tropes. This is none of the above.
Rhetorical, eh? ... Eight!
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And redefining (e.g. broadening or narrowing), but that also doesn't seem to be what you're asking for.
I have to say that I'm neutral, leaning towards positive, on the suggestion. I'm not a big fan of dividing examples unless it's leading towards a possible future split, and I don't think dinosaurs constitute a proper subtrope. But I'm not sure they're not, and in any case, my dislike for such things is too mild for me to insist.
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No, the other one.
Dinosaurs being found is a common specific subject of the trope rather than a proper subtrope. Considering they make up around half the page's examples, they're at least notable as such, I think.
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Given how short the page is, I'm wondering why it is split on "dinosaurs" and "non-dinosaurs" (with a sub-split per type of media). Wouldn't it be easier to just split on media like most pages?
Rhetorical, eh? ... Eight!