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Author | Topic: Fish Out of Water Almost 20 Million Years Faster | |||||||||||||||||||||||
Iblis Member (Idle past 3896 days) Posts: 663 Joined: |
Behold, I teach you the tetrapod; he is this uber, he is this fishy!
Discovered in an abandoned mountain quarry, the tracks suggest that tetrapods were traipsing the planet 18 million years earlier than previously indicated by the fossil record.
http://news.nationalgeographic.com/...tion-walking-land.html The tracks are also ten million years older than the oldest known fossils of lobe-finned fishes called elpistostegids, which are widely considered to be transitional forms between fish and tetrapods. (See a surviving lobe-finned fish, the coelacanth.) The age of the newfound tracks suggest that "these transitional fish continued to exist alongside the tetrapods for quite some period of time," said Per Ahlberg, a paleontologist at Uppsala University in Sweden, who led the new research. It's not so strange for one type of animal to live alongside its evolutionary successors, Ahlberg noted. Several feathered dinosaurs, for example, "continued to exist alongside the birds for millions of years."
Marine Environment The finding also suggests the fins-to-limbs evolution occurred in an intertidal or lagoon environment rather than a seasonally flooded forest, as indicated by earlier finds. The tidal "scenario has considerable explanatory power," the researchers write in Nature. Due to the regular coming and going of the tides, marine ancestors of tetrapods, for example, would have had easy access twice a day to marine animals stranded at low tide. This reliable smorgasbord would have helped tetrapod ancestors find their legs, so to speak. "If you're picking off dead and moribund animals in the strand landthose things left behind by the receding tidewell then you don't need to be terribly good at moving around," Ahlberg noted. "You just need to be able to haul your way out, eat what you want to eat, and then haul your way back into the water again." Admittedly, the NG is a tabloid; but it sounds like something like a hellbender or giant newt was working the shoreline a few geological moments earlier than we had suspected. These guys sound more significant than mere lungfish or walking cat, ie more ancestral and less fraternal. Read, call attention to any interesting points, enjoy.
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Percy Member Posts: 22392 From: New Hampshire Joined: Member Rating: 5.3 |
From a blog:
Why Evolution Isn’t True? With Tetrapod Tracks Predating Tiktaalik, the Origin of Land Animals Just Got More Perplexing | Prometheus Unbound From Access Research Network: http://www.arn.org/...bbing_a_grenade_into_the_tetrapod_evol --Percy Edited by Percy, : Correct reference.
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Iblis Member (Idle past 3896 days) Posts: 663 Joined: |
Yep, this is super-interesting.
Rethinking the why and where is another aspect of this explosive discovery. The first tetrapods have been recognised as animals that lived in water. People have wondered whether fins evolved into legs as the animals negotiated plant material in shallow waters, perhaps brackish or even freshwater. These ideas may still be applicable to Acanthostega and Ichthyostega, but they are not realistic for the new tetrapod trackways - which are found in marine tidal flat sediments.
http://www.arn.org/...bbing_a_grenade_into_the_tetrapod_evol "Niedzwiedzki and colleagues' apparently anachronistic Eifelian tetrapod trackways will thus shake up thinking about tetrapod origins. They show that the first tetrapods thrived in the sea, trampling the mud of coral-reef lagoons; this is at odds with the long-held view that river deltas and lakes were the necessary environments for the transition from water to land during vertebrate evolution." The ID interest in this story is for at least two reasons. First, the case documents an example of a failed evolutionary prediction - although, for a while, evolutionists have claimed it as a triumph (see the blog by Casey Luskin on this). Second, the evolution of tetrapods is an important test case for the relevance of design thinking - we ask the question whether tetrapods are here by Design or whether Law+Chance processes are sufficient explanation. Research is proceeding assuming the latter option, but the new discovery suggests that pursuing multiple working hypotheses (including design-based options) might be more prudent. I was thinking about this when I first read the story. It reminds me of all the times we have discovered man overlapping people like neanderthal we had thought were ancestral. I don't take it too seriously, coelecanths and newts are still alive now.
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RAZD Member (Idle past 1405 days) Posts: 20714 From: the other end of the sidewalk Joined: |
There is also the issue of whether the evolution to tetrapod from fish occurred once or several times. Seeing as we see existing organisms with mobile ability in tidal mud flats it is not unreasonable that such adaptation to a new opportunity occurred several times.
Enjoy. we are limited in our ability to understand
by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. • • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •
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RAZD Member (Idle past 1405 days) Posts: 20714 From: the other end of the sidewalk Joined: |
I love this tidbit
quote: How can you illustrate something that is undetermined (and why does it look like tiktaalik?) Enjoy. Edited by RAZD, : color
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RAZD Member (Idle past 1405 days) Posts: 20714 From: the other end of the sidewalk Joined: |
Hi Iblis,
Here's the Nature issue: Muddy tetrapod origins | Nature
quote: Enjoy we are limited in our ability to understand
by our ability to understand Rebel American Zen Deist ... to learn ... to think ... to live ... to laugh ... to share. • • • Join the effort to solve medical problems, AIDS/HIV, Cancer and more with Team EvC! (click) • • •
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Dr Adequate Member (Idle past 285 days) Posts: 16113 Joined: |
Good grief, how can the creationists even pretend to be pleased about fossil evidence of walking fish?
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greyseal Member (Idle past 3862 days) Posts: 464 Joined: |
Dear Doctor Adequate:
Good grief, how can the creationists even pretend to be pleased about fossil evidence of walking fish? THIS.
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Iblis Member (Idle past 3896 days) Posts: 663 Joined: |
How can you illustrate something that is undetermined (and why does it look like tiktaalik?) I think what they did was to take Tiki and give him feet a bit more like those of Icky Tetrapod - Wikipedia
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