No, Piltdown Man was accepted by some scientists (not all, as I've said before, many saw through the hoax almost instantly) because they wanted it to be real and did not do their work properly. Had they examined it, they would have instantly recognised that it was a bad fake.
Then why aren't you using that knowledge?
No. I wouldn't, and someone who's actually trained in these things sure wouldn't. If you have a bone that's confirmed to be from an animal, and you compare it from another one, and the two are the same, then you can infer that they belong to the same, or at least extremely similar animals.
What? Two foramen magnums? How do you come up with such nonsense? What, you expect ancestral hominids to have two spinal columns?
The difference is in skull shape, proportions and dentition. Hell, the only difference between a human and a dolphin skull is the shape. What else would be different??
We also have both juvenile and adult skulls alongside various skeletons from different individuals. That makes a distinct species.
Lions and tigers are so closely related that they can produce non-viable offspring, like horses and donkeys. It's a completely different thing. There
These are all anatomically modern humans, anyone with a cursory understanding of anatomy or anthropology would tell you that. Australopithecines have comparatively much smaller neurocraniums when compared to other parts of the skull. And they have different teeth. And bones. And everything.
And please answer my question:
"please tell me what known medical condition results in exactly the same deformities (that affect practically every bone in the body) and how could multiple individuals (adults and children) with the exact same deformities proliferate in such high numbers in Africa at that time, while there were no healthy individual anywhere nearby?
Things get very difficult especially when the bones are extremely similar to human or ape bones and more then 50% of the skeleton is missing and there is no living precendant of the new species in question.
Deformities do not need to be due to medical conditions only.
The above is a chimp skull.Compare the upper half of the chimp skull and the Lucy reconstruction you posted.