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Genetic analysis of Tardigrades suggests closer relation to Roundworms
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Topic Started: Aug 4 2017, 10:57 AM (476 Views)
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Talenkauen
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Aug 4 2017, 10:57 AM
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Perpetually paranoid iguanodont
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http://www.eartharchives.org/articles/tardigrade-genome-reveals-secrets-of-their-toughness-and-evolution/
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Talenkauen
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Aug 4 2017, 10:58 AM
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Perpetually paranoid iguanodont
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Oh crap, wrong board. Can someone move this to Science Central?.....
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Yiqi15
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Aug 4 2017, 11:12 AM
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Talenkauen
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Aug 4 2017, 11:15 AM
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- Yiqi15
- Aug 4 2017, 11:12 AM
I can copy and post it for you.
I'm not sure if that's necessary.
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LittleLazyLass
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Aug 4 2017, 11:43 AM
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Zorcuspine
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Aug 4 2017, 11:44 AM
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Got it.
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IIGSY
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Aug 4 2017, 12:20 PM
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Isn't the tardigrade-nematode relationship an artefact of long branch attraction? Don't tardigrades share several unique microRNA'S with velvet worms and arthropods?
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Quotes "Arthropod respiratory systems aren't really "inefficient", they're just better suited to their body size. It would be quite inefficient for a tiny creature that can easily get all the oxygen it needs through passive diffusion to have a respiratory system that wastes energy on muscles that pump air into sacs. (Hence why lungless salamanders, uniquely miniscule and hyperabundant tetrapods, have ditched their lungs in favor of breathing with their skin and buccal mucous membranes.) But large, active insects already use muscles to pump air in and out of their spiracles, and I don't see why their tracheae couldn't develop pseudo- lungs if other conditions pressured them to grow larger."-HangingTheif
"Considering the lifespans of modern non- insect arthropods (decade-old old millipedes, 50 year old tarantulas, 100+ year old lobsters) I wouldn't be surprised if Arthropleura had a lifespan exceeding that of a large testudine"-HangingTheif
"Humans have a tribal mindset and it's not alien for tribes to war on each other. I mean, look at the atrocities chimpanzee tribes do to each other. Most of people's groupings and big conflicts in history are directly or obliquely manifestations of this tribal mindset."-Sceynyos-yis
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kusanagi
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Aug 4 2017, 02:47 PM
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Stem tardigrade Orstenotubulus was not walking on its lobopodia but comparisons have been made between the cuticle of O. and of onychophora. Not enough to state a relationship though. The lobopodia of tardigrades unlike those of onychophores are telescopic. I'm not 100% sure tardigrades are panarthropods because if they are then their anatomy is apomorphic and particularly miniaturized. Nielson was mistaken in his Tactopoda hypothesis placing tardigrades closer to euarthropods than are onychophores. The Liu et al paper claiming Diana is a true arthropod placed tardigrades and onychophores as a monophyletic clade to the exclusion of euarthropods.
Edited by kusanagi, Aug 4 2017, 02:53 PM.
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IIGSY
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Aug 4 2017, 03:03 PM
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- kusanagi
- Aug 4 2017, 02:47 PM
Stem tardigrade Orstenotubulus was not walking on its lobopodia How do we know that? And what does telescopic mean?
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Projects Punga: A terraformed world with no vertebrates Last one crawling: The last arthropod
ARTH-6810: A world without vertebrates (It's ded, but you can still read I guess)
Potential ideas- Swamp world: A world covered in lakes, with the largest being caspian sized. Nematozoic: After a mass extinction of ultimate proportions, a single species of nematode is the only surviving animal. Tri-devonian: A devonian like ecosystem with holocene species on three different continents.
Quotes "Arthropod respiratory systems aren't really "inefficient", they're just better suited to their body size. It would be quite inefficient for a tiny creature that can easily get all the oxygen it needs through passive diffusion to have a respiratory system that wastes energy on muscles that pump air into sacs. (Hence why lungless salamanders, uniquely miniscule and hyperabundant tetrapods, have ditched their lungs in favor of breathing with their skin and buccal mucous membranes.) But large, active insects already use muscles to pump air in and out of their spiracles, and I don't see why their tracheae couldn't develop pseudo- lungs if other conditions pressured them to grow larger."-HangingTheif
"Considering the lifespans of modern non- insect arthropods (decade-old old millipedes, 50 year old tarantulas, 100+ year old lobsters) I wouldn't be surprised if Arthropleura had a lifespan exceeding that of a large testudine"-HangingTheif
"Humans have a tribal mindset and it's not alien for tribes to war on each other. I mean, look at the atrocities chimpanzee tribes do to each other. Most of people's groupings and big conflicts in history are directly or obliquely manifestations of this tribal mindset."-Sceynyos-yis
"He's the leader of the bunch You know his Coconut Gun is finally back to fire in spurts. His Coconut Gun Can make you smile If he shoots ya it's firing in spurts. His Coconut Gun Is bigger, faster, stronger too! He's the gun member of the Coconut Crew! HUH!
C.G.! Coconut Gun! C.G.! Co-Coconut Gun! Shoot yourself with a Coconut Gun! HUH!"-Kamineigh
"RIP, rest in Peytoia."-Little
"In Summary: Piss on Lovecraft's racist grave by making lewds of Cthulhu and Nyarlathotep.
Then eat arby's and embrace the void."-Kamineigh
"Dougal Dixon rule 34."-Sayornis
Phylogeny of the arthropods and some related groups
In honor of the greatest clade of all time
More pictures
Other cool things
All African countries can fit into Brazil
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Rodlox
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Aug 4 2017, 07:46 PM
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- Insect Illuminati Get Shrekt
- Aug 4 2017, 03:03 PM
- kusanagi
- Aug 4 2017, 02:47 PM
Stem tardigrade Orstenotubulus was not walking on its lobopodia
How do we know that? And what does telescopic mean? ever see, in movies or tv, how they pull a telescope open, or slam one short? that.
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.---------------------------------------------. Parts of the Cluster Worlds: "Marsupialless Australia" (what-if) & "Out on a Branch" (future evolution) & "The Earth under a still sun" (WIP)
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IIGSY
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Aug 4 2017, 08:00 PM
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A huntsman spider that wastes time on the internet because it has nothing better to do
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- Rodlox
- Aug 4 2017, 07:46 PM
- Insect Illuminati Get Shrekt
- Aug 4 2017, 03:03 PM
- kusanagi
- Aug 4 2017, 02:47 PM
Stem tardigrade Orstenotubulus was not walking on its lobopodia
How do we know that? And what does telescopic mean?
ever see, in movies or tv, how they pull a telescope open, or slam one short? that.  So it had retractable limbs?
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Projects Punga: A terraformed world with no vertebrates Last one crawling: The last arthropod
ARTH-6810: A world without vertebrates (It's ded, but you can still read I guess)
Potential ideas- Swamp world: A world covered in lakes, with the largest being caspian sized. Nematozoic: After a mass extinction of ultimate proportions, a single species of nematode is the only surviving animal. Tri-devonian: A devonian like ecosystem with holocene species on three different continents.
Quotes "Arthropod respiratory systems aren't really "inefficient", they're just better suited to their body size. It would be quite inefficient for a tiny creature that can easily get all the oxygen it needs through passive diffusion to have a respiratory system that wastes energy on muscles that pump air into sacs. (Hence why lungless salamanders, uniquely miniscule and hyperabundant tetrapods, have ditched their lungs in favor of breathing with their skin and buccal mucous membranes.) But large, active insects already use muscles to pump air in and out of their spiracles, and I don't see why their tracheae couldn't develop pseudo- lungs if other conditions pressured them to grow larger."-HangingTheif
"Considering the lifespans of modern non- insect arthropods (decade-old old millipedes, 50 year old tarantulas, 100+ year old lobsters) I wouldn't be surprised if Arthropleura had a lifespan exceeding that of a large testudine"-HangingTheif
"Humans have a tribal mindset and it's not alien for tribes to war on each other. I mean, look at the atrocities chimpanzee tribes do to each other. Most of people's groupings and big conflicts in history are directly or obliquely manifestations of this tribal mindset."-Sceynyos-yis
"He's the leader of the bunch You know his Coconut Gun is finally back to fire in spurts. His Coconut Gun Can make you smile If he shoots ya it's firing in spurts. His Coconut Gun Is bigger, faster, stronger too! He's the gun member of the Coconut Crew! HUH!
C.G.! Coconut Gun! C.G.! Co-Coconut Gun! Shoot yourself with a Coconut Gun! HUH!"-Kamineigh
"RIP, rest in Peytoia."-Little
"In Summary: Piss on Lovecraft's racist grave by making lewds of Cthulhu and Nyarlathotep.
Then eat arby's and embrace the void."-Kamineigh
"Dougal Dixon rule 34."-Sayornis
Phylogeny of the arthropods and some related groups
In honor of the greatest clade of all time
More pictures
Other cool things
All African countries can fit into Brazil
|
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kusanagi
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Aug 5 2017, 06:04 AM
Post #12
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Tardigrade lobopodia possess a retractile in-out nature like the telescope. Those of O. we're of no use in walking like an onychophores, based upon their position - think of the cave leech lobopodia. So if nothing else functional legs may have evolved twice in ecdysozoans.
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