Homo rudolfensis muscles into a better place at the big, noisy hominid family table


Reconstruction of Homo habilis at the Westfälisches Museum für Archäologie, Herne, courtesy of the Wikipedia.

At one time the proposed hominid line taught to new anthropology students was pretty simple. It went something like Australopithicus to Homo habilis, habilis to H. erectus, erectus to us. This was debated, but it was a basic view the fossil evidence supported.

It’s more complicated now, that tree is bushy, but the good news is some details have been filled in. One of the details is or was Homo rudolfensis, henceforth called Rudy here, a proposed subspecies that lived about 2 MYA. But Rudy was only represented by a handful of teeth, bone scraps, and one beautifully preserved, fairly complete skull dubbed KNM-ER 1470 found by none other than Richard and Meave Leakey at Koobo Fora, Kenya, in 1972. That may have changed this week:

BBC News– The finds back the view that a skull found in 1972 is of a separate species of human, known as Homo rudolfensis. The skull was markedly different to any others from that time. It had a relatively large brain and long flat face. But for 40 years the skull was the only example of the creature and so it was impossible to say for sure whether the individual was an unusual specimen or a member of a new species.With the discovery of the three new fossils researchers can say with more certainty that H.rudolfensis really was a separate type of human that existed around two million years ago alongside other species of humans.

That’s exciting! All human and primate origins are fascinating both in themselves and because they’re related to us. But this one is even more exciting, it’s an excellent teaching opportunity and introduction, for you awesome budding anthropology students and anthro buffs, for two hugely productive schools of thought in anthropology and zoology in general, splitters and lumpers.

Lumpers might argue Rudy is just an early H. hab or particular kind of late model Australo. Splitters might argue Rudy is a full-blown specific species on its own. There’s no right or wrong group, both have made predictions that have been confirmed by subsequent research, they each drive science in a positive way by providing healthy skepticism, they each push someone making claims about a lump call or a split call to be as rigorous as possible to wave off that healthy criticism. It’s science, real science, with real skepticism and real debates — not that bullshit contrived conservative nonsense we are forced to spend time and resources keeping at bay — over the most fascinating questions we can conceive.

With the new material, splitters who saw in that one sample some of the predicted suite of features that might fit nicely between earlier hominids, such as A. africanus or A. farensis (Lucy), and later hominids like as H. habilis and H. ergaster that are more firmly associated with the ancestral line leading to anatomically modern humans. Bear in mind, if you read about it elsewhere, you know the term that will probably be used. For what’s it’s worth, Rudy wasn’t missing, we knew about his possible existence thanks to ER 1470 and had already bene debating its meaning for some time. This suggests Rudy really could be a link though, between two better established hominid taxons, both of which lead to us.

Comments

  1. says

    I’m not a biologist, but I’m personally inclined to suspect that both Rudolfensis and Habilis are part of our ancestry. IIRC, tehre’s been genetic confirmation of interbreeding between Sapiens and Neandertalensis, as well as another hominid type whose name escapes me. Given that, and the fact that many families of mammals can (and do) breed across species lines, it wouldn’t surprise me at all if it turned out that the various hominid lineages merged, rather than most of the going extinct per se.

  2. busterggi says

    Just how big do you think my dining table is?

    He can sit in the living room with the kids.

  3. jakc says

    Call me really old school. I’m not sure we should be splitting of H hab or H ergaster fro H erectus. Splitting out to be a last resort. This is not the forum for a long rant on the subject, but some people are trying to crowd in 6 or 8 species of Homo in the last 2MY. Actually, I think some might be up to 10 or 11. That’s just way too many.

  4. Midnight Rambler says

    And yet the NPR science reporter went through a whole segment on Talk of the Nation about the new discoveries saying repeatedly that “these new specimens don’t have a name yet”, in spite of correctly associating them with 1470.

  5. sawells says

    Fun fact: Francis Bacon noted that natural philosophers tend to be either lumpers or splitters in his “Advancement of Learning” in the early 17th century.

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