| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
| Users: | 27 |
| Nodes: | 6 (0 / 6) |
| Uptime: | 40:27:23 |
| Calls: | 631 |
| Calls today: | 2 |
| Files: | 1,187 |
| D/L today: |
24 files (29,813K bytes) |
| Messages: | 174,392 |
https://www.science.org/doi/10.1126/science.ado9202
The phylogenetic position of the Yunxian cranium elucidates the origin
of Homo longi and the Denisovans
EditorrCOs summary
It is now well known that there were at one time many Homo lineages. Understanding of the differences among these lineages is largely
dependent upon crania that are rare and often damaged and deformed by
age. Feng et al. reconstructed the 1-million-year-old Yunxian 2 cranium using an approach that allowed for removal of much of the compression
and distortion naturally present in the fossil. In doing so, they found
that the cranium contained both primitive and derived traits and
concluded that it is representative of the H. longi clade, which is
sister to H. sapiens and likely contained the Denisovans. rCoSacha Vignieri
Abstract
Diverse forms of Homo coexisted during the Middle Pleistocene. Whether
these fossil humans represent different species or clades is debated.
The ~1-million-year-old Yunxian 2 fossil from China is important for understanding the cladogenesis of Homo and the origin of Homo sapiens.
In this study, we restored and reconstructed the distorted Yunxian 2
cranium using recently introduced technology. The results show that this cranium displays mosaic primitive and derived features. Morphometric and phylogenetic analyses suggest that it is an early member of the Asian H. longi clade, which includes the Denisovans and is the main part of the sister group to the H. sapiens clade. Both the H. sapiens and H. longi clades have deep roots extending beyond the Middle Pleistocene and
probably experienced rapid early diversification. Yunxian 2 may preserve transitional features close to the origins of the two clades.
erik simpson wrote:
https://www.science.org/doi/10.1126/science.ado9202
The phylogenetic position of the Yunxian cranium elucidates the origin
of Homo longi and the Denisovans
EditorrCOs summary
It is now well known that there were at one time many Homo lineages. Understanding of the differences among these lineages is largely
dependent upon crania that are rare and often damaged and deformed by
age. Feng et al. reconstructed the 1-million-year-old Yunxian 2 cranium using an approach that allowed for removal of much of the compression
and distortion naturally present in the fossil. In doing so, they found that the cranium contained both primitive and derived traits and
concluded that it is representative of the H. longi clade, which is
sister to H. sapiens and likely contained the Denisovans. rCoSacha Vignieri
Abstract
Diverse forms of Homo coexisted during the Middle Pleistocene. Whether these fossil humans represent different species or clades is debated.
The ~1-million-year-old Yunxian 2 fossil from China is important for understanding the cladogenesis of Homo and the origin of Homo sapiens.
In this study, we restored and reconstructed the distorted Yunxian 2 cranium using recently introduced technology. The results show that this cranium displays mosaic primitive and derived features. Morphometric and phylogenetic analyses suggest that it is an early member of the Asian H. longi clade, which includes the Denisovans and is the main part of the sister group to the H. sapiens clade. Both the H. sapiens and H. longi clades have deep roots extending beyond the Middle Pleistocene and probably experienced rapid early diversification. Yunxian 2 may preserve transitional features close to the origins of the two clades.
Thanks!
Other popular press articles:
<https://news.google.com/stories/CAAqNggKIjBDQklTSGpvSmMzUnZjbmt0TXpZd1NoRUtEd2l4aEt6TkR4R0FoTFVJYTVEbVp5Z0FQAQ?hl=en-US&gl=US&ceid=US%3Aen>
Of real interest is John Hawks' blog
https://www.johnhawks.net/p/the-problem-skulls-from-yunxian
The problem skulls from Yunxian
The relationships of fossils from deep time in
China may help reveal ancestral connections for
the Denisovans
...
I like whenever Science publishes provocative
studies like this. They can help the field think
through some of the most challenging problems.
Yet thererCOs a reason IrCOm using the words
provocative and challenging. The headlines IrCOve
seen about this study today are all just nonsense.
It doesnrCOt rCLrewrite human evolutionrCY, rCLpoint to
earlier origin of modern humansrCY, or rCLredraw the
human family tree.rCY
What this research should have done is to put the
anatomical comparisons into context with the
previous results from DNA, especially the genomes
that enable us to understand the relationships of
Denisovan, Neanderthal, and modern human groups.
This study did not do that.
IrCOm going to give that a bit of a try. What I think
is that the new work helps to show the overlap of
variation of the Denisovan group with Homo erectus
and other archaic groups of humans in skull size,
shape, and form. That overlap reflects both
adaptation and possibly some gene flowrCoand may help
us to understand the superarchaic signature of DNA
mixture in ancient people.
...
erik simpson wrote:
https://www.science.org/doi/10.1126/science.ado9202
The phylogenetic position of the Yunxian cranium elucidates the origin
of Homo longi and the Denisovans
EditorrCOs summary
It is now well known that there were at one time many Homo lineages.
Understanding of the differences among these lineages is largely
dependent upon crania that are rare and often damaged and deformed by
age. Feng et al. reconstructed the 1-million-year-old Yunxian 2
cranium using an approach that allowed for removal of much of the
compression and distortion naturally present in the fossil. In doing
so, they found that the cranium contained both primitive and derived
traits and concluded that it is representative of the H. longi clade,
which is sister to H. sapiens and likely contained the Denisovans.
rCoSacha Vignieri
Abstract
Diverse forms of Homo coexisted during the Middle Pleistocene. Whether
these fossil humans represent different species or clades is debated.
The ~1-million-year-old Yunxian 2 fossil from China is important for
understanding the cladogenesis of Homo and the origin of Homo sapiens.
In this study, we restored and reconstructed the distorted Yunxian 2
cranium using recently introduced technology. The results show that
this cranium displays mosaic primitive and derived features.
Morphometric and phylogenetic analyses suggest that it is an early
member of the Asian H. longi clade, which includes the Denisovans and
is the main part of the sister group to the H. sapiens clade. Both the
H. sapiens and H. longi clades have deep roots extending beyond the
Middle Pleistocene and probably experienced rapid early
diversification. Yunxian 2 may preserve transitional features close to
the origins of the two clades.
Thanks!
Other popular press articles:
<https://news.google.com/stories/CAAqNggKIjBDQklTSGpvSmMzUnZjbmt0TXpZd1NoRUtEd2l4aEt6TkR4R0FoTFVJYTVEbVp5Z0FQAQ?hl=en-US&gl=US&ceid=US%3Aen>
Of real interest is John Hawks' blog
https://www.johnhawks.net/p/the-problem-skulls-from-yunxian
The problem skulls from Yunxian
The relationships of fossils from deep time in
China may help reveal ancestral connections for
the Denisovans
...
I like whenever Science publishes provocative
studies like this. They can help the field think
through some of the most challenging problems.
Yet thererCOs a reason IrCOm using the words
provocative and challenging. The headlines IrCOve
seen about this study today are all just nonsense.
It doesnrCOt rCLrewrite human evolutionrCY, rCLpoint to
earlier origin of modern humansrCY, or rCLredraw the
human family tree.rCY
What this research should have done is to put the
anatomical comparisons into context with the
previous results from DNA, especially the genomes
that enable us to understand the relationships of
Denisovan, Neanderthal, and modern human groups.
This study did not do that.
IrCOm going to give that a bit of a try. What I think
is that the new work helps to show the overlap of
variation of the Denisovan group with Homo erectus
and other archaic groups of humans in skull size,
shape, and form. That overlap reflects both
adaptation and possibly some gene flowrCoand may help
us to understand the superarchaic signature of DNA
mixture in ancient people.
...