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From: Mario Petrinovic <mario.petrinovic1@zg.htnet.hr>
Newsgroups: sci.anthropology.paleo
Subject: Re: The taxonomy of Sahelanthropus tchadensis from a craniometric
 perspective
Date: Wed, 31 Jul 2024 15:31:42 +0200
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On 30.7.2024. 9:38, Mikko wrote:
> On 2024-07-29 15:18:31 +0000, Pandora said:
>> Op 29-07-2024 om 07:19 schreef Primum Sapienti:
>>> The paper's date is given at the very bottom as
>>> Manuscript received on June 15, 2023;
>>> accepted for publication on October 20, 2024
>>>
>>>
>>>
>>> https://www.scielo.br/j/aabc/a/GGPvzpzxZpPccBWzFncgRTG/?format=pdf&lang=en
>>>
>>> Abstract: Sahelanthropus tchadensis has raised
>>> much debate since its initial discovery in Chad
>>> in 2001, given its controversial classification
>>> as the earliest representative of the hominin
>>> lineage. This debate extends beyond the
>>> phylogenetic position of the species, and
>>> includes several aspects of its habitual
>>> behavior, especially in what regards its
>>> locomotion. The combination of ancestral and
>>> derived traits observed in the fossils
>>> associated with the species has been used to
>>> defend different hypotheses related to its
>>> relationship to hominins. Here, the cranial
>>> morphology of Sahelanthropus tchadensis was
>>> assessed through 16 linear craniometric
>>> measurements, and compared to great apes
>>> and hominins through Principal Component
>>> Analysis based on size and shape and shape
>>> information alone. The results show that
>>> S. tchadensis share stronger morphological
>>> affinities with hominins than with apes for
>>> both the analysis that include size
>>> information and the one that evaluates shape
>>> alone. Since TM 266-01-060-1 shows a strong
>>> morphological affinity with the remaining
>>> hominins represented in the analysis, our
>>> results support the initial interpretations
>>> that S. tchadensis represents an early
>>> specimen of our lineage or a stem basal
>>> lineage more closely related to hominins
>>> than to Panini.
>>>
>>>
>>> "Taken together, these two analyses show a
>>> strong morphological affinity of
>>> Sahelanthropus with hominins."
>>>
>>> "In conclusion, our analyses can safely
>>> reject that the craniofacial morphology of
>>> Sahelanthropus tchadensis is similar to that
>>> of great apes, and in that sense they lend
>>> support to those studies that place this
>>> species within our lineage (Brunet et al.
>>> 2002, Guy et al. 2005, Zollikofer et al.
>>> 2005). However, from the perspective of
>>> overall cranial morphology, Sahelanthropus
>>> shows a bauplan that is significantly
>>> departed from the one observed among apes
>>> and early australopithecine, falling closer
>>> to the morphospace occupied by early Homo
>>> species. "
>>
>> It's a rather strange, counterintuitive, result that the cladistically 
>> most basal hominin, Sahelanthropus, is morphometrically closer to Homo 
>> than to Australopithecus and the great apes.
> 
> Perhaps the climat at the time of Sahelanthropus was closer to climat at
> the time of early Homo than the climat between those times.
> 

		My advice to you would be, if you want to understand the past, 
whenever you see the world "climate", or "climate change", just stop 
reading, and put this book/paper you are reading into garbage can. 
Because, those who don't know anything, when they are asked to explain 
something, they just use words "climate change". Climate changes every 
year. Maybe not in Finland, but in my country (Croatia), we have warm 
summers and cold winters. Look at that, "climate change".