Pages

Guide to Patagonia's Monsters & Mysterious beings

I have written a book on this intriguing subject which has just been published.
In this blog I will post excerpts and other interesting texts on this fascinating subject.

Austin Whittall


Thursday, January 29, 2015

Primitive yet recent jawbone from Taiwan; Penghu 1


An article published in Nature Communicatons on Jan. 27, 2015 describes a mandible belonging to an archaic Homo species from Taiwan, known as Penghu 1. The bone, a lower jawbone with some teeth is remarkable because it displays robust primitive features which do not appear in other contemporary hominids. It is recenty yet primitive.


The authors propose that Penghu 1 is a survivor of "multiple evolutionary lineages among archaic hominins before the arrival of modern humans in the region." [1]


There is a growing body of evidence showing that Asia was not a dead end for human evolution, the notion that H. erectus settled there after leaving Africa and died out or was replaced by modern Humans 50 kya is being refuted by new findings.


The age of Penghu 1's remains is a bit uncertain: "younger than 450 ka, and most likely 10-70 ka or 130-190 ka." [1], which is very recent for primitve features and definitively too primitive to be H. sapiens.


The interesting part is that Penghu 1 is a mossaic of Chinese, Asian and non-Asian archaic jawbones. It is very similar to the Hexian remains (found in China, 590 mi - 950 km north of the Penghu 1 site), which have been placed within the H. erectus line and have been dated to 400 - 150 ka (there is controversy about this date). So this opens the door to some possible link between H. erectus and the Penghu 1 man.


Penghu 1 lacks some features found in Eurasian Neanderthals (so it is not derived from Neanderthals meandering across Asia into Taiwan).


What is remarkable is the survival until such recent dates of teeth that are so large, and set in thick mandibles. This is a very primitive trait. But how does Penghu 1 fit into our ancestral family treee? The authors suggest that:


Several different models can be proposed to explain this situation. First, such morphology may be primitive retention from earlier Asian Homo. Because H. erectus mandibles from the terminal Early or early Middle Pleistocene of Java and China had already acquired thinner corpus and smaller molars, this hypothesis implies the presence of another longstanding Homo lineage in Asia that continued from the Early Pleistocene.
Otherwise, there may have been a migration of robust-jawed Homo from Africa, possibly bringing along Acheulean stone tool technology around the terminal Early Pleistocene, who later evolved some unique morphology locally. Both hypotheses cast doubt on the traditional view that H. erectus was the sole hominin species on the Asian continent in the Early to early Middle Pleistocene...
[1]


In other words their hypothesis 1 suggests that an "earlier Asian Homo" had thick jaws and big molars and that these archaic features were inherited by a later group that descended from these primitive Homos (that is what "primitive retention" means: they retained an archaic feature). This means that this archaic lineage survived and was contemporary with the smaller jawed H. erectus that coexisted with Penghu 1.


While hypothesis 2, proposes that some thick jawed Africans bearing Acheulean toolage, reached Asia in the final stages of the Early Pleistocene (which ended 781 kya), and that they evolved separately from the extant and contemporary H. erectus that were already living there, and who had more gracile jaws.


In the first case mentioned above, Who was this ancient Asian? Perhaps some surviving H. habilis? that left Africa before H. erectus? and survived until recently?


In the second case, which African group used Acheulean toolage and migrated out of Africa 780 kya? This was later than the wave of H. erectus that peopled Asia. Did these more recent heavy jawed Africans cross Asia to Taiwan through H. erectus populated China? We can rule out H. heidelbergensis because the paper says that Penghu 1 "1 lacks a suit of uniquely derived morphology of west Eurasian H. neanderthalensis (and in part its Middle Pleistocene predecessor, ‘H. heidelbergensis’)." [1]. So who is the ancestor?


The authors point out that "Figure 7b also suggests that Penghu 1 is similar to ‘Denisovans’14 in M2 crown size; however, a direct comparison is not possible as there are no mandibles and mandibular teeth associated with this enigmatic Siberian hominin" [1], suggesting similarities with Denisovans...


Sources


Chang, C.-H. et al. The first archaic Homo from Taiwan. Nat. Commun. 6:6037 doi: 10.1038/ncomms7037 (2015).



Patagonian Monsters - Cryptozoology, Myths & legends in Patagonia Copyright 2009-2014 by Austin Whittall © 

3 comments:

  1. Austin,

     Thanks for the right up. Very good summation of the possibilities.


     I saw that article when it hit  and it does pose some interesting questions.

      First is its true age, if it's at the older side of the spectrum, then which archaic is it?

     It's evidently not HSN and it's more robust than contemporary asian HE. I don't think it's denisovan, because it doesn't share some characteristics with HH, and we know from los Huesos that HH was the common ancestor to HSN and HSD.

      

     We can't forget the red deer cave people, who also retain some archaic traits.

      A few months ago a visited the National Museum of Natural History, and spent most of the afternoon studying the display of homo skull casts. It was most fascinating to see important crania right next to each other.

     Two skulls stood out the most for me, the kow swamp skull and the texpexpan 1?.

     Kow swamp is stunning in its robustness, it's age is near the younger end of Penghu's dates. Could they be related?

     Texpexpan was unique in that ,of all of the AMH skulls it has a pronounced sagital keel, which is a very archaic trait.


     Another possibility for penghu, is it represents microevolution of a modern population, in response to dietary and lifestyle pressures.


    J.Lawrence Angel said this of a set of Holocene burials from central California, the Tranquility burials.



     



    "The least certain conclusion concerns evolutionary selective pressures resulting from a tough meat diet and hard living conditions leading to a short lifespan. These pressures would put a high premium on the fertility of a few women, especially those having massive teeth to resist wear (cf. Brace, 1962). Possibly Mongoloid features are a result of such pressures. The source for this extra tooth and face size not yet fully developed in late Pleistocene East Asia might be a recombination of genes from a tropical Negritoid population (contributing canine plus incisor breadth and prognathism) with genes from Sinanthropus descendants like Mapa (Woo, 1959 b; Coon, 1962) contributing shovel incisors and face massiveness, and perhaps also with Upper Paleolithic "White" genes. Evolution from such a proto-Mongoloid blend in a Mongoloid direction would have occurred in both Asia and America after 20,000 B.C. Apparently this evolution went much further in Asia"


     I can't help but notice the sinanthropus (homo erectus) reference along with some point we see being brought out recently, namely that native Americans displayed "mongoloid" traits before they show up in Asia. 

     

     Hopefully more material will be found in the region.

    ReplyDelete
  2. No remarks s to the giant size of the Jaw? Odd!

    ReplyDelete
  3. http://patagoniamonsters.blogspot.com.ar/2015/12/could-maludong-remains-belong-to.html
    This post tells more about these odd archaic South Chinese people who were contemporary to modern humans in that region.

    ReplyDelete

Hits since Sept. 2009:
Copyright © 2009-2014 by Austin Victor Whittall.
Todos los derechos reservados por Austin Whittall para esta edición en idioma español y / o inglés. No se permite la reproducción parcial o total, el almacenamiento, el alquiler, la transmisión o la transformación de este libro, en cualquier forma o por cualquier medio, sea electrónico o mecánico, mediante fotocopias, digitalización u otros métodos, sin el permiso previo y escrito del autor, excepto por un periodista, quien puede tomar cortos pasajes para ser usados en un comentario sobre esta obra para ser publicado en una revista o periódico. Su infracción está penada por las leyes 11.723 y 25.446.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means - electronic, mechanical, photocopy, recording, or any other - except for brief quotations in printed reviews, without prior written permission from the author, except for the inclusion of brief quotations in a review.

Please read our Terms and Conditions and Privacy Policy before accessing this blog.

Terms & Conditions | Privacy Policy

Patagonian Monsters - http://patagoniamonsters.blogspot.com/