I had a good laugh about this one today. This fish supposedly existed 370 million years ago. They found one swimming in the ocean , now they know they still exist. Whats amazing is, during all that time, their flippers never turned into feet. Lol:) What I think is interesting about this link is. All his proof for his claims magically disappeared off the internet. Dont you think thats interesting? I do:) modomedia/quantum/magicfish.html The first amphibious tetrapods are found in rocks that are about 360 million years old, while four-lobe-finned fish are known from 380 million year old rocks. These fishes were ultimately evolutionary dead ends that became extinct around the end of the Devonian Period, about 350 million years ago. Still others were armored fishes that possessed a feeding adaptation that would revolutionize vertebrate, evolution: These fishes had jaws. permanentrevolution.net/entry/2731 In the Lower Devonian, ammonoids appeared, leaving us large limestone deposits from their shells. Bivalves, crinoid and blastoid echinoderms, graptolites, and trilobites were all present, though most groups of trilobites disappeared by the close of the Devonian. The Devonian is also notable for the rapid diversification in fish. Benthic, jawless, armored fish are common by the Lower Devonian. These early fish include a number of different groups. By the the Middle Devonian, placoderms, the first jawed fish, appear. Many of these grew to large sizes and were fearsome predators. Of the greatest interest to us is the rise of the first sarcopterygians, the lobe-finned fish, which eventually produced the first tetrapods just before the end of the Devonian. ucmp.berkeley.edu/devonian/devonian.php From Lobe-Finned Fish to Early Amphibian. Lobe-finned fish evolved into the earliest amphibians. A lobe-finned fish could breathe air for brief periods of time. It could also use its fins to walk on land for short distances. What similarities do you see between the lobe-finned fish and the amphibian? ck12.org/book/CK-12-Biology/r3/section/17.1/ Fig. 1 A comparison of the skeletons of the lobe-finned fish Eusthenopteron (above) and the primitative amphibian Ichthyostega(below). Reprinted with permission from Colbert and Morales, Evolution of the Vertebrates,4th ed., (New York: John Wiley a& Sons, 1991), 69. asa3.org/ASA/PSCF/1998/PSCF12-98Davis.html.ori Click on the evolution button on this link. en.m.wikipedia.org/wiki/Sarcopterygii A lobe fin fish fossil pic. blog.everythingdinosaur.co.uk/blog/_archives/2008/01/21/3476160.html It was only after those animals and plants had colonized land and soils began to develop and there were perhaps damp microclimates within these early plant communities that the back-boned animals, the lobe-finned fishes particularly, began to exploit those new environments that had been set up on land. pbs.org/wgbh/evolution/library/04/3/text_pop/l_043_41.html The fins of Lobe finned fish are believed to be what the first legs of tetrapods formed from. The bones in these fishes fins were arranged in pairs and were supported by the skeleton, this allowed limbs to emerge. It is from here that the first land dwelling animals appeared however there are hypotheses’ as to why these fish left the water (Coates, 2002). The first hypothesis is thought to have been because of natural selection. It is thought that these lobe finned fish may have been caught in masses of water which dried out, this determined which of the fish died and allowing all that lived to evolve to suit the environment. The other hypothesis is that these fish were chased from the water by predators and took to the land; this acted both a refuge and a place to feed on insects and plants. However, to prove these statements and really understand the evolution of legs to enable the change from water to land, a very primitive tetrapod had to be found. (Zimmer, The origin of tetrapods) gareths-biology-assignment.weebly Video of the lobe fin fish. They are real. Coelacanth: The Fish That Time Forgot [documentar…: youtu.be/yz1oTHXvbHg
Posted on: Wed, 02 Jul 2014 21:57:51 +0000
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