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Author Topic:   Yet another transitional fossil
PaulK
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Posts: 17822
Joined: 01-10-2003
Member Rating: 2.2


Message 1 of 7 (387650)
03-01-2007 6:21 PM


Every year more transitional fossils come to light, some more important than others. This is an especially important one, shedding new light on the "Cambrian Explosion"
New Fossil Unites Three Branches of Life in the Cambrian

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 Message 2 by Nighttrain, posted 03-01-2007 6:30 PM PaulK has replied
 Message 4 by Chiroptera, posted 03-01-2007 6:48 PM PaulK has not replied

  
Nighttrain
Member (Idle past 3994 days)
Posts: 1512
From: brisbane,australia
Joined: 06-08-2004


Message 2 of 7 (387651)
03-01-2007 6:30 PM
Reply to: Message 1 by PaulK
03-01-2007 6:21 PM


PT
Hi, Paul, I thought the concept of phylogeny had moved on from a tree to a sphere to a mosaic? (see link within your link)

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 Message 1 by PaulK, posted 03-01-2007 6:21 PM PaulK has replied

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 Message 3 by PaulK, posted 03-01-2007 6:36 PM Nighttrain has replied

  
PaulK
Member
Posts: 17822
Joined: 01-10-2003
Member Rating: 2.2


Message 3 of 7 (387654)
03-01-2007 6:36 PM
Reply to: Message 2 by Nighttrain
03-01-2007 6:30 PM


Re: PT
As far as I am aware the only place where phylogeny may not be tree-like is at the roots - single celled organisms (accepting that even modern bacteria can be quite prone to horizontal genetic transfer). That really isn't relevant to this find.

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 Message 2 by Nighttrain, posted 03-01-2007 6:30 PM Nighttrain has replied

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Chiroptera
Inactive Member


Message 4 of 7 (387658)
03-01-2007 6:48 PM
Reply to: Message 1 by PaulK
03-01-2007 6:21 PM


Yet another transitional fossil?
Gosh, how many can there possibly be?
Great find, Paul.

Actually, if their god makes better pancakes, I'm totally switching sides. -- Charley the Australopithecine

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Nighttrain
Member (Idle past 3994 days)
Posts: 1512
From: brisbane,australia
Joined: 06-08-2004


Message 5 of 7 (387659)
03-01-2007 6:57 PM
Reply to: Message 3 by PaulK
03-01-2007 6:36 PM


Re: PT
Not trying to pull your thread off-topic, but here`s an approach:
A well-known paleontologist, Stephen J. Gould, had proposed that a better metaphor for the evolutionary history of earth’s life forms is a fuzzy bush not a tall bifurcating tree. Even so, Gogarten maintains that Gould’s metaphor does not sufficiently describe the pattern of microbial genomic exchange that has been emerging from his own research on HGT. According to Gogarten evolution corresponds neither to a tree nor a bush, but rather to a net in which lines of descent not only diverge but also communicate and even merge with one another.
and
Concluding his presentation, Gogarten brought attention to the metaphors biologists use to describe their work to the general public. Because the original metaphor of a tree no longer fits the data from recent genome research, Gogarten suggested that biologists use the metaphor of a mosaic to describe the different histories of combined in individual genomes and use a the metaphor of a net to visualize the rich exchange and cooperative effects of HGT among microbes
From;
http://www.esalenctr.org/display/confpage.cfm?confid=10&p...
Gogarten proposed this in 2000. Not sure how well it has been accepted.

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Brad McFall
Member (Idle past 5033 days)
Posts: 3428
From: Ithaca,NY, USA
Joined: 12-20-2001


Message 6 of 7 (387662)
03-01-2007 7:02 PM
Reply to: Message 5 by Nighttrain
03-01-2007 6:57 PM


Re: PT
NT,
Gogarten is refering "to the roots" that Paul mentioned and the difficulty with thus constructing a "single tree of life" does not affect the issue of what kind of thing that hair clamp looking creature is or was.
I might speculate that there is some connection via the shapes of cell death from bacteria through volvox etc but Paul is right as far as he goes here.

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PaulK
Member
Posts: 17822
Joined: 01-10-2003
Member Rating: 2.2


Message 7 of 7 (387663)
03-01-2007 7:04 PM
Reply to: Message 5 by Nighttrain
03-01-2007 6:57 PM


Re: PT
Gould's "fuzzy bush" is about the shape of the tree. And I talked about HGT in microbes - and this fossil certainly isn't a microbe !

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 Message 5 by Nighttrain, posted 03-01-2007 6:57 PM Nighttrain has not replied

  
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