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:iconeofish: #Eofish
Fleshy Lobes and Body Armor

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November 22, 2011
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:icongogosardina:
2011, acrylics on card/photography/digital

Early-Middle Silurian (late Telychian to early Wenlock stages), Maoshan Formation, Zhejiang, China

In a shallow estuary, strange jawless fishes of the galeaspid lineage (Shuyu zhejiangensis) grub around in the sediment in a never ending search for edible detritus.

Over 420 million years from now, synchrotron radiation X-ray scans of fossils of this fish will provide humanity with the first real evidence for the steps that led to the evolutionary origin of jaws.

Researchers found that the paired nasal sacs of are located anterolaterally in the braincase while the hypophyseal duct opens anteriorly towards the oral cavity. These three structures (the paired nasal sacs and the hypophyseal duct) were thus already independent of each other, like in in the jawed gnathostomes but unlike all other jawless fishes (lampreys, hagfish etc). Therefore, these fishes have the condition that current developmental models regard as prerequisites for the development of jaws - even though they didn't have jaws.

Artwork originally published in: Zhikun Gai, Philip C. J. Donoghue, Min Zhu, Philippe Janvier and Marco Stampanoni (18 August 2011). "Fossil jawless fish from China foreshadows early jawed vertebrate anatomy". Nature 476: 324–327
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:iconjackiejobs:
Mood: Noble ~jackiejobs May 5, 2012
SHYU
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:iconeurwentala:
*Eurwentala Apr 1, 2012
Nice! Before this, the origin of jaws seemed to be one of the last great transitions of vertebrate evolution with no intermediate fossils whatsoever. Or have some been found without me noticing?
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:iconweirdraws:
~weirdraws Dec 5, 2011
water looks perfect
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:iconavancna:
=avancna Nov 22, 2011  Hobbyist Traditional Artist
Galeaspids were freshwater?
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:icongogosardina:
*Gogosardina Nov 22, 2011  Professional Traditional Artist
Erm - Maoshan is probably marginal marine (theres is abundant plant and Protaxites material so it was close to a freshwater source) so likely represents an estuarine setting - I've fixed the description to state this.
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:iconavancna:
=avancna Nov 22, 2011  Hobbyist Traditional Artist
Oh. Understood.
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:iconwanderingalbatross:
~WanderingAlbatross Nov 22, 2011  Hobbyist Traditional Artist
Super, super cool! I love how you showed the ventral position of the one on the left.
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:iconwaltb2b:
*waltb2b Nov 22, 2011
nice drawing and excellent commentary- thanks.
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