Perhaps they are all the same species

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Discussion Overview

The discussion revolves around the classification of hominid species, particularly the similarities and differences among Homo Erectus, Homo Heidelbergensis, and Neanderthals. Participants explore the criteria for species classification in the context of physical traits and evolutionary lineage, raising questions about taxonomy and the implications of morphological similarities.

Discussion Character

  • Debate/contested
  • Conceptual clarification
  • Exploratory

Main Points Raised

  • Some participants note that Homo Erectus, Homo Heidelbergensis, and Neanderthals appear similar in physical traits, such as weak chins and brow ridges, questioning why they are classified as different species despite these similarities.
  • Others highlight that significant morphological differences exist within Homo sapiens, such as between Pygmies and Mongoloids, yet they are classified under the same species, suggesting a potential inconsistency in species classification.
  • One participant proposes that genomic analysis might provide a more accurate classification than morphology, which can be misleading.
  • A participant introduces the concept of convergent evolution, using the example of whales, to illustrate that similar traits can evolve independently in different species.

Areas of Agreement / Disagreement

Participants express differing views on the criteria for species classification, with no consensus reached on whether morphological similarities or genetic data should take precedence in determining species status.

Contextual Notes

Participants reference cladistics and evolutionary biology concepts, but the discussion does not resolve the complexities of taxonomy or the implications of convergent evolution on species classification.

Calpalned
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1) The most popular credence is that Homo

Erectus/Ergaster gave rise to Homo Heidelbergensis, which in turn is

the ancestor of the Neanderthal. However, each of the species I

mentioned, to me, appear pretty much the same. They all have weak

chins and brow ridges. Their face shape generally stays the same.

The only difference is an augmentation in brain size. Why are they

considered different species?
 
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Calpalned said:
1) The most popular credence is that Homo

Erectus/Ergaster gave rise to Homo Heidelbergensis, which in turn is

the ancestor of the Neanderthal. However, each of the species I

mentioned, to me, appear pretty much the same. They all have weak

chins and brow ridges. Their face shape generally stays the same.

The only difference is an augmentation in brain size. Why are they

considered different species?
Well, Pygmies and Mongoloids appear pretty different to me. And yet they belong to the Homo sapiens species.
 
zoki85 said:
Well, Pygmies and Mongoloids appear pretty different to me. And yet they belong to the Homo sapiens species.
So it is clear that people who look quite different are grouped into the same species. But ironically, people who look similar (at least according to their skull and bone shape) like homo erectus, neanderthal, heidelbergensis, antecessor etc, are split up into different species. This is so odd.
 
Calpalned said:
So it is clear that people who look quite different are grouped into the same species. But ironically, people who look similar (at least according to their skull and bone shape) like homo erectus, neanderthal, heidelbergensis, antecessor etc, are split up into different species. This is so odd.
Let genome be fair judge here since eye can be misleading
 
I agree with zoki85. We might think whales were a type of big fish if we judge only by morphology, but whales descended from four legged land animals. What we have here is what's called "convergent evolution". Different species can evolve the same trait (in this case fins) independently.
 
Thank you zoki85 and Pythagorean
 

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