Are we descended from monkeys?

Today I gave my lecture on mammal diversity and evolution in the 4th year vertebrate course. We have been talking a fair bit about paraphyletic groups, common vs. scientific names, and so on. Within this context, we explored the issue of whether we’re “descended from monkeys”, by taking a look at a phylogeny of relevant primates:

The issues that we noted were:

  1. “Apes”, as defined as orangutans, gorillas, and chimps, but not humans, is paraphyletic. In other words, either “apes” is not a scientifically defensible term or else it must include humans.
  2. “Monkeys” is paraphyletic, and in particular Old World monkeys are more closely related to “apes” than they are to New World monkeys. (Also, humans and Old World monkeys are equally closely related to New World monkeys).
  3. We are not descended from any modern “monkeys” or “apes”, rather we share common ancestors with them. (In that sense, the answer is NO to whether we’re descended from monkeys).
  4. The last ancestor shared by all apes (including humans) would itself probably have qualified as an ape. (In that sense, the answer is YES we are descended from an ape, but not any of the modern species).
  5. For “monkeys” not to be problematic, it would have to include apes. In that sense, we would be apes AND monkeys. (And, for that matter, we’re also lobe-finned fishes). As above, it may very well be that the ancestor of all monkeys and apes (the very bottom node on the phylogeny) would have been considered a monkey, and therefore YES we are descended from a monkey (but again, not any modern species).

After class, one of my students emailed me a link to this video, which explores the issues nicely. The author takes a cladistic approach and concludes that we are descended from monkeys for the reasons listed above.

What do you think?


5 comments to Are we descended from monkeys?

  • Rose Chang

    Thanks for the post. I deal with this question all the time in evolutionary psychology courses. As you point out, you could say we've descended "from" monkeys in a broad sense. But what is at issue are the assumptions behind such a statement. I think students say we are descended from monkeys thinking that the theory of evolution by natural selection posits that we are directly related to them – because they don't see the distinction between apes and monkeys (nor that humans are classified as apes for that matter).
    In the US, consumers must love a chimp because they show up in commercials all the time. But most of the time, they are called "monkeys" by the voiceover. I guess as my students would say, you know what I mean.

      (Quote)

  • Jonathan Badger

    Isn't the whole issue really just a matter of the English language? As your tree shows, "monkey" is a phylogenetically meaningless term that English uses to describe small tailed primates and not a clade to themselves. Other languages, such as French don't make the ape/monkey distinction and as chance would have it, French has it right.

      (Quote)

  • Rogério Penna

    Interesting post. It turns out I found this link in a thread which I created at Randi forums, asking this exact same question.
     
    I was intrigued why so many people/sites would tell we did not descend from monkeys. Just because we do not descent from any CURRENTLY EXISTING monkey species does not means our ancestor species would not be considered monkeys. Quite the contrary, I am sure that if we found our common ancestors with old world monkeys, alive today in some african forest, everyone would consider it a “monkey”.

      (Quote)

  • Ethan Snow

    I see all the time that even people who are more educated on evolution often slip up when it comes to our relation to monkeys. Personally, I find that paraphyletic groups are ridiculous and not based in science but based on special preference. Creating a paraphyletic group is like me having a son with a deformity and saying that he isn’t human. Old world monkeys and new world monkeys couldn’t have evolved from something that wasn’t itself a monkey and since we evolved from their common ancestor, then we must also be monkeys. People always seem to take offence when we say we came from and still are monkeys which is actually really silly.

      (Quote)

  • Halima

    Hi, To the question are humans evolved from apes? I say it ‘s bullshit.
    In several divine religions as Islam and Charistianity, there are several clear verses that state that the human being was created by God and Adam and Eve are the first human creatures.With regards to animals,they are creatures as well but are different from us and we are superior than them. Human beings are priviliged by God who has the ultimate power to fashion and create the greatest creation ever-the human being-
    We, humans can seem similar to animals, when we say this person is faithful and the dog is very known for that or the monkey is very intelligent but not to the extent to say that monkeys are the begining and origin of humans.
    Science cannot explain all the times everything , there may be research or even a number of conducted surveys and studies but they cannot ensure and guarantee its 100 % truth as the case of Darwin taht is just a theory and was proved to be false and wrong.
    So my answer is human beings are God’s greatest creatures.

      (Quote)

Leave a Reply

 

 

 

You can use these HTML tags

<a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>

*