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Old 03-12-2012, 08:14 PM   #1736395  /  #1
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Default New Jurassic salamander is world's oldest

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A newly discovered 157-million-year-old salamander is the oldest of its kind and would've swum with the aquatic beasts of the Jurassic.

The discovery supports the idea that this order diverged from other salamanders earlier than thought, the researchers said.

Six specimens of this new species, now called Beiyanerpeton jianpingensis, were discovered in the Tiaojishan Formation, in Liaoning Province, China. Some other salamander specimens discovered in the area are quite a bit smaller than B. jianpingensis, suggesting they are either juveniles or a smaller species. The salamander's scientific name comes from "beiyan," an ancient name for the area in which it was discovered, and "herpeton," the Greek word for creeping animal.
http://www.livescience.com/18991-jur...er-oldest.html

paper:

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Gao, K-Q. and Shubin, N.H. (2012) Late Jurassic salamandroid from western Liaoning, China. PNAS, advance online.

A Jurassic salamander, Beiyanerpeton jianpingensis (gen. et sp. nov.), from a recently found site in western Liaoning Province, China is the earliest known record of Salamandroidea. As a Late Jurassic record of the group, it extends the range of the clade by ~40 Ma. The Late Jurassic taxon is neotenic and represented by exceptionally preserved specimens, including fully articulated cranial and postcranial skeletons and bony gill structures close to the cheek region. The fossil beds, consisting of dark-brown volcanic ash shales of the Upper Jurassic Tiaojishan (Lanqi) Formation (Oxfordian), underlie trachyandesite rocks that have yielded a SHRIMP zircon U-Pb date of 157 3 Ma. The fossiliferous beds are substantially older than the Jehol Group, including the Yixian Formation (40Ar/39Ar dates of 122129 Ma), but slightly younger than the Middle Jurassic Daohugou horizon (40Ar/39Ar date of 164 4 Ma). The early fossil taxon shares with extant salamandroids derived character states, including: separated nasals lacking a midline contact, angular fused to the prearticular in the lower jaw, and double-headed ribs on the presacral vertebrae. In contrast to extant salamandroids, however, the salamander shows a discrete and tooth-bearing palatine, and unequivocally nonpedicellate and monocuspid marginal teeth in large and presumably mature individuals. The finding provides insights into the evolution of key characters of salamanders, and also provides direct evidence supporting the hypothesis that the split between Cryptobranchoidea and Salamandroidea had taken placed before the Late Jurassic Oxfordian time. In this aspect, both paleontological and molecular data now come to agree.
paper online free:

http://www.pnas.org/content/early/20...28109.abstract
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Old 03-12-2012, 11:26 PM   #1736626  /  #2
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Oh that's out now, cool.
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Old 03-16-2012, 07:26 PM   #1741489  /  #3
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Its a great new fossil!
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Old 03-16-2012, 10:24 PM   #1741730  /  #4
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Embargoed.
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Old 03-16-2012, 10:30 PM   #1741737  /  #5
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Old 03-16-2012, 10:32 PM   #1741740  /  #6
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Stevie is like a drug addict but for science.
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Old 03-16-2012, 10:53 PM   #1741762  /  #7
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Embargoed
teeth.
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Last edited by Bilirubin; 03-20-2012 at 06:15 AM.
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Old 03-16-2012, 10:56 PM   #1741764  /  #8
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Old 03-16-2012, 10:57 PM   #1741767  /  #9
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I fixed mine.
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Old 03-16-2012, 11:00 PM   #1741772  /  #10
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Old 03-16-2012, 11:08 PM   #1741777  /  #11
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I am back to work i promise
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Old 03-18-2012, 06:23 PM   #1743369  /  #12
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Embargoed.
Thanks!
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Old 03-26-2012, 07:25 PM   #1752818  /  #13
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Embargoed.
Thanks!
Embargo is officially lifted as of half an hour ago, but the PNAS Early Edition still hasn't updated.
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Old 03-29-2012, 05:12 PM   #1756635  /  #14
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Commentary is out now. Not sure how available it is; could pop it on Dropbox if needed.
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Old 11-16-2014, 06:07 AM   #2455141  /  #15
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