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Convergent evolution thread? Convergent evolution...
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You are currently reading a thread in /an/ - Animals & Nature

Thread replies: 79
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Convergent evolution thread? Convergent evolution thread.
Staring with sort of a stretch
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>>2061707
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>>2061709
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>>2061715
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My personal favorite.
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it's pretty crazy to see animals with completely different ancestries and DNA end up so similar.
Marsupials and Placental mammals split over 150 million years ago, but look at this shit.
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>>2061707
Should flying fish really be compared to animals that could actually fly? Flying fish are gliders.
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explain this shit
nearly identical organs, evolved from totally different structures (vertebrates being outgrowths from the brain while the octopus evolved from its skin) in very different animals, cephalopods having evolved before fucking trees existed.
shit like this is why I don't think the concept of humanoid aliens is as outlandish as some people think.
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>>2061752
>from totally different structures
that is still the same germ layer (ectoderm)
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>>2061747
All flying creatures started out as gliders. Although I suppose flying fish should more easily be compared to flying squirrels and those snakes that jump from treetops and glide through the air.
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>>2061715

Quick tip: If you ever find one of these guys in your house, give them water and feed them rodent lab blocks before letting them outside. Unless it's injured in some way, in which case you should take it to a wildlife rehabber if possible.

They rarely come into houses unless they're VERY hungry. Flying squirrels have extremely high nutrient requirements and easily die of metabolic bone disease (which happens due to insufficient calcium and vitamin D).

Lab blocks have a lot of nutrients that the squirrel can use to regain its strength and heal from early stage MBD before its too late.

After feeding and watering the squirrel it would be good to leave some lab blocks in a clean, dry place nearby so the squirrel can eat again. I believe they can also eat button mushrooms, especially the kind that have vitamin D.
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>>2061794

But, just to be clear--mushrooms aren't anywhere near as nutritious as lab blocks. I think they can be given as a treat or for a little help, but they won't fix MBD or any serious nutritional deficiencies.

Lab blocks are the gold standard for feeding pretty much any kind of common omnivorous rodent in need.
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>>2061794
Can we like have one thread on here that doesn't devolve into "save the cute animals" like its not invalid but it's not appropriate all the Fucking time.
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>>2061752
>tfw blind spot

if anyone can explain pic related without googling then you are my soul mate
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>>2061720
Thinking about it.
Why did fish-like reptiles went to the X-tinction bar?
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>>2061802
because K–Pg
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>>2061798
Obviously not. This is the fate of all /an/ threads.

This or bugguy.
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>>2061811
Yeah, that. I forgot.
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sort of related?
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>>2061822
As someone who knows nothing about them, they don't look very similar.
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>>2061826
Their role is the same. See filename.
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>>2061829
Oh, yeah...
For some reason i though they had the same origin on a convergent evolution thread.
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>>2061832
>same origin
>convergent evolution

Somebody dropped out of high school
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>>2061834
Anon, i'm saying the opposite.
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>>2061822
Completely related anon, in a few cases, completely unrelated fish developed extremely similar antifreeze proteins to the point that they have the same threshold for the coldest temps they can withstand. Along with extremely analogous protein structures. I wish I could source but it's been a while since I've studied af proteins.
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>>2061811
Didn't most pterosaurs and sea reptiles went extinct few mya before the mass extinction?
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>>2061892
According to Wikipedia the last pteros died at the k-pg boundary, and the Ichthyosaurus died before. Mosaurs and plesiosaurs died at the end of the event.
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>>2061892
impossible to say since the margin for error on our dating methods is a few million years.

also rocks that record the few million years just before and after the boundary are pretty fucking rare and the bones of reptiles are large enough that the bottom can rest on one layer and the top can be in another layer that's ten million years newer.
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>>2061798
>STOP TALKING ABOUT ANIMALS ON THE ANIMAL BOARD
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>>2061937
It has nothing to do with the topic on hand. No one asked for autistic flying squirrel advice just like no one asked for your spazz attack.
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>>2061794
>>2061796
What the fuck does this have to do with anything?
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My favorite
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>>2062043
I always thought the Dimetrodon/Spinosaurus/Crocodile jaw notch thing was weird.
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Now for something different: cacti and euphorbia.
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english is not my first language, so I'm not sure I understand the subject of the thread right. It's completely different animals that end up with very similar features, right?
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>>2062137

Essentially yes
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>>2062043
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>>2061715
Don't forget me!
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>2016
>still believing Evolution is real
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Mice and Pocket Mice
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>>2062408
>2016
>believing anything
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>>2061707
It kinda boggles my mind that marine reptiles developed a reversed heterocercal fin instead of a normal heterocercal. What advantages did it had?
Assuming it isn't just a product of other things like fabricational factors and stuff...
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>>2061801
Assuming the one on the left is a Chioglossa (kinda looks like one but I'm no expert), both of them would have autotomical tails.I guess.
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>>2062408
'merica pls go be stupid somewhere else
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>>2063186
>Sharks use their asymmetric tail fin to compensate for the fact that they are negatively buoyant, heavier than water, by making the downward pressure exerted by the tail force the body as a whole in an ascending angle. This way, swimming forwards will generate enough lift to equal the sinking force caused by their weight. In 1973, McGowan concluded that, because ichthyosaurs have a reversed tail fin asymmetry compared to sharks, they were apparently positively buoyant, lighter than water, which would be confirmed by their lack of gastroliths and of pachyostosis or dense bone. The tail would have served to keep the body in a descending angle. The front flippers would be used to push the front of the body further downwards and control pitch.
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>>2063203
Thanks m9.
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>>2063203
makes sense for an air breathing animal to be more buoyant.
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>>2062043
where is this fish from? Africa,right?
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>>2063517
Good ol US of A
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>>2063191
Don't you have a Syrian refugees dick to be sucking right about now
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Primate hand and treefrog hand.
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>>2063862
That's just Sweden.
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How about the highly complex brains that both hominids and corvids developed.

It's amazing how we actually have dinosaurs which developed essentially ape-like cognition and behaviour.
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>>2063190
Yes the left one is Chioglossa, the right one is Plethodon. That works too I guess but wasn't the original reason.

Different genus in different families that are lungless with long tails in order to have a larger respiratory surface, the skin (given that Plethodontidae are all lungless; Chioglossa being a Salamandrid)

Another example of the same convergence is the genus Onychodactylus in the Hynobiidae family.

Pic is another neat convergence in a Plethodontid and the olm (Proteidae).
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>>2064035
Is that a Texas blind salamander (Eurycea rathbuni) on the left?

Black olms and Necturus are another nice example.
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>>2064044
yep, it is

I keep forgetting there's a subspecie of the olm.
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>>2064050
Actually the "white one" is probably 5 or 6 species (not subspecies). At least according to genetics.
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>>2064056
Can you link me up senpai?
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>>2064059
That's gonna be a tough one. The paper is about 10 years old, not sure i'll find it.
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>>2064059
>http://www.academia.edu/5407624/A_molecular_test_for_cryptic_diversity_in_ground_water_how_large_are_the_ranges_of_macro-stygobionts

Maybe you'll find something here, I don't have time to look that into it right now.
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>>2064066
I'll look into it man, don't bother too much. I was intrigued because I've never read anything about it (not that I read that much anyway).

Here's an opacum for your trouble.
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>>2064076

Thanks, that's a pretty dank salamander.
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>>2061715
>>2062385
cats too have some flabby ski on their body. While not nearly as pronounced as those other guys it still allows them to slow down their descent
https://www.youtube.com/watch?v=rMaZ4WAmc1c
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>>2062408
>believing evolution
>believing
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>>2064669
He thinks scientific facts are only true if you believe in them. It's an american thing.
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>>2061707
The fact that they are not paired by class bothers me greatly
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>>2061709
Armadillos and anteaters are closely related though
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>>2061752
>they have no blindspots
We're on the wrong end of evolution mates
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>>2062115
Pretty much all theropods have the notch between maxilla and premaxilla, it's just particularly noticeable in certain families like those of dilophosaurus and spinosaurus
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>>2061709
THERE GIANT PANGOLINS
WHEN WAS GOING TO BE TOLD OF THIS
PANGOLINS ARE ADORABLE
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>>2065514
>they die before they can teach their offspring
take what you can get m8
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>>2065510
They're both xenarthrans but not necessarily close. Elephants and hyraxes are closer to each other than to monkeys by virtue of being afrotherians, but are still far apart from each other.
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>>2065973
Being in the same order means the similar body shape, limbs and diet are not convergent evolution but evolution not divergent enough.
>Elephants and hyraxes are closer to each other than to monkeys
No shit, they are also closer to manatees than fucking squirrels, how is that in any way surprising if you know about taxonomy?
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This thread is so cool. What about felines and fossa?
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>>2061709
Where is the aardvark?
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>>2063932
Ravens are fucking amazing, my biggest regret about not being immortal is that I'll never see how these guys develop in a couple billion years
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>>2061747
If I recall correctly flying fishes are the current most competent gliders/borderline flyer. If they had lungs beforehand they would be flying by now
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>>2061752
It's not really complex. Light sensible cells for simply for day circle detection > skins folds around them forming a camera obscura for light direction > filled with liquid for protection against dust. Lens-bearing eyes have evolved seven times independently, compared to just flying evolving just 4.
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