Help with my cartilaginous buddies reddit.com/gallery/sc581k
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πŸ‘€︎ u/JudgementalDjinn
πŸ“…︎ Jan 25 2022
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Cartilaginous Mammals: Aquatic Speculation

Alright so, there's been a bit of questions towards aquatic mammals and why it keeps happening lately. I'm developing several essays around that at the time, and this blare is a small contribution not necessarily in proper order

Having recently acquired some insight into a non-cetacean aquatic lineage, Sirenia, I considered an adaptation I thought remarkable if it would ever occur; a cartilaginous skeleton. Not fully so, mind you, perhaps starting at low impact areas, and then exaggerating greatly. It would reduce the weight of the animal, for speed and flexibility, especially in tight spaces. Several amphibians have done this, but I'm not aware of it in mammals. It seems most likely to happen in the water, where less support from bony structures is needed

As for what could develop such a system, rodents, shrews (not great at my terminology), and bats seem likely. Bats are the weird one, though they already have lightweight skeletons, and keeping them would make sense

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πŸ‘€︎ u/IronTemplar26
πŸ“…︎ Dec 31 2021
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The American paddlefish is a primitive fish that inhabits large, freshwater rivers such as the Mississippi River and its tributaries. Fossils of this fish date back to 125 million years ago. Its skeleton is almost entirely cartilaginous and its paddle-shaped rostrum measures 1/3 of its body-length. v.redd.it/cmw2b9m53bg71
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πŸ‘€︎ u/KimCureAll
πŸ“…︎ Aug 09 2021
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I ordered takeout food and found this strange object in the cooked beans. It looked cartilaginous or even made of some kind of plastic. The disposable fork was able to break the object when I applied force. reddit.com/gallery/pzaaju
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πŸ‘€︎ u/Rasfael23
πŸ“…︎ Oct 01 2021
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Size comparison of 115 species of cartilaginous fish
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πŸ‘€︎ u/WilhelmsCamel
πŸ“…︎ Aug 28 2021
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A chimaera close-up at ~3,000 ft (914 m) depth, between Florida and Cuba. Chimaeras, also known as ghost sharks, are about 50 species of cartilaginous fish that are closely related to sharks, skates and rays. The dots on its head are electroreceptors used for prey detection. πŸ“·:NOAA
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πŸ‘€︎ u/radxiphias
πŸ“…︎ Sep 26 2021
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[WP] You are a guinea pig sized arthropod 60 million years after a mass extinction caused by a gamma ray burst. You have to cross a river, but it's infested with cartilaginous fish that can crawl onto land for short amounts of time.
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πŸ‘€︎ u/not_ur_uncle
πŸ“…︎ Sep 10 2021
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Just ate my first wood ears, sautΓ©ed with butter and salt, and they tasted like butter and salt, but felt remarkably cartilaginous. Aptly named…
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πŸ‘€︎ u/CerousRhinocerous
πŸ“…︎ Oct 10 2021
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A chimaera close-up at ~3,000 ft (914 m) depth, between Florida and Cuba. Chimaeras, also known as ghost sharks, are about 50 species of cartilaginous fish that are closely related to sharks, skates and rays. The dots on its head are electroreceptors used for prey detection. πŸ“·:NOAA
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πŸ‘€︎ u/radxiphias
πŸ“…︎ Sep 26 2021
🚨︎ report
The American paddlefish is a primitive fish that inhabits large, freshwater rivers such as the Mississippi River and its tributaries. Fossils of this fish date back to 125 million years ago. Its skeleton is almost entirely cartilaginous and its paddle-shaped rostrum measures 1/3 of its body-length. v.redd.it/woejwqba6bg71
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πŸ‘€︎ u/KimCureAll
πŸ“…︎ Aug 09 2021
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Possible dorsal spine from a Cartilaginous Fish? Carboniferous limestone, Kentucky reddit.com/gallery/kzx3i8
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πŸ‘€︎ u/grunman126
πŸ“…︎ Jan 18 2021
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I have a collection of bones I bought that came from Africa, The box said stingray bones, I having trouble believing this because of stingrays cartilaginous skeletons what are you guys think, they’re definitely bones because they have a porous structure reddit.com/gallery/p7i5su
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πŸ‘€︎ u/crankyjob21
πŸ“…︎ Aug 19 2021
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Could a human level of intelligence, humanoid tetrapod analog survive with a cartilaginous skeleton? What drawbacks would it have?
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πŸ‘€︎ u/Jeep-Eep
πŸ“…︎ Jun 25 2021
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Found on the Oregon coast; cartilaginous with a spongy center.
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πŸ‘€︎ u/LuckyEyeVintage
πŸ“…︎ Jul 31 2021
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Cartilaginous find from the beach in California.
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πŸ‘€︎ u/CurrentAir8666
πŸ“…︎ Mar 26 2021
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Scientists have successfully reconstructed a 66 million-year-old shark that looked similar to modern-day manta rays, providing previously unknown insights into the morphology of cartilaginous fishes of the late Cretaceous. academictimes.com/bizarre…
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πŸ‘€︎ u/Furebsi
πŸ“…︎ Mar 18 2021
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The cartilaginous supports of the Epaulette Shark's paired fins are reduced and separated when compared to other sharks, allowing them to be rotated for use as limbs. This allows it to crawl out of the water and traverse the tidal pools that it inhabits. gfycat.com/higheverlastin…
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πŸ‘€︎ u/Pardusco
πŸ“…︎ Nov 24 2019
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Size comparison of 115 species of cartilaginous fish
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πŸ‘€︎ u/Kunphen
πŸ“…︎ Aug 28 2021
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Two different lineages of duck from my Farm World project that each independently evolved a shark-like cartilaginous skeleton, by Dylan Bajda reddit.com/gallery/ktmnnt
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πŸ‘€︎ u/SummerAndTinkles
πŸ“…︎ Jan 09 2021
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[Keyser] ahead of the World Series, the public deserves a clear answer: Are they a celebration of sunbeams or of a celebration of cartilaginous fish? twitter.com/hannahrkeyser…
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πŸ‘€︎ u/aresef
πŸ“…︎ Oct 19 2020
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Might not look like much but I believe this may be one of the first shortnosed sturgeon skulls ever completed. the fact that they are both cartilaginous and bony makes them incredibly difficult to work with. I wish I could add more photos to this post to fully explain why
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πŸ‘€︎ u/Schnare-taxidermy
πŸ“…︎ Mar 05 2021
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Despite their cartilaginous skeletons, occasionally sharks leave beautiful whole-body fossils. This is an extinct bullhead shark (Paracestracion danieli) from the late Jurassic (150-154 MYA) in what is now Germany.
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πŸ‘€︎ u/Selachophile
πŸ“…︎ Jun 01 2021
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TIL bony fish see in colour, but sharks (and other cartilaginous fish) do not see as many colours, which helps explain why the markings of bony fish are so colourful simplydiscus.com/library/…
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πŸ‘€︎ u/jacknunn
πŸ“…︎ Jan 03 2021
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Cartilaginous Fish Bullshit Magic

Clearly there exists in the universe a powerful force, akin to the phoenix force in the marvel universe, that powers baseball teams that embrace the will of the Cartilaginous Ones to crazy wins. Last year the Nationals worshiped at the altar of the almighty Baby Shark with the Sacred Dance do do do do do do. This year the devil rays (I will continue to refer to them as such as a flappy sea creature is a way better mascot than a burst of light) do the thing they did last night.

The Nats need to spend time this offseason studying this ancient force and learning out to channel it.

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πŸ‘€︎ u/rockidr4
πŸ“…︎ Oct 25 2020
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The Horned Screamer (Anhima cornuta) has a number of bizarre traits, including a cartilaginous spike protruding from its head that will grow back if broken off, knife-like wing spurs, and skin and bones riddled with tiny pneumatic air sacs.
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πŸ‘€︎ u/pansycarn
πŸ“…︎ May 27 2020
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I found this skull while diving in Mallorca (Spain). It is cartilaginous. What is it?? reddit.com/gallery/mcctdu
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πŸ‘€︎ u/Elena_Angela
πŸ“…︎ Mar 24 2021
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Beginner. I’ve macerated mammals and cleaned their skulls. However what can I do with this guy I found? I know they have cartilaginous skeletons but unsure how to proceed.
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πŸ‘€︎ u/camilly000
πŸ“…︎ Sep 02 2020
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The hyoid bone is the only bone in humans that does not articulate with any other bone, but only has muscular, ligamentous, and cartilaginous attachments
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πŸ‘€︎ u/yayikayran
πŸ“…︎ May 12 2020
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Tell me about your many alien races, and why they're all brightly-colored humans with small cartilaginous ornaments
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πŸ‘€︎ u/HSI-U1-H
πŸ“…︎ May 23 2019
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A deep sea Chimaera. Closely related to sharks, they branched into their own group around 400 million years ago. Like sharks, they have no bones and are entirely cartilaginous. Source: NOAA Office of Ocean Exploration and Research
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πŸ‘€︎ u/PiDawg
πŸ“…︎ Aug 25 2020
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Can anyone ID? Found along a South-East UK beach, seemed more cartilaginous than bone - was wondering if someone here could give me a clue as to what it is. About two foot long, as a guess. TIA! reddit.com/gallery/kn5euu
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πŸ‘€︎ u/kt_ls_
πŸ“…︎ Dec 30 2020
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Carboniferous cartilaginous fishes Iniopera, Edestus, Glikmanius, and Stethacanthus, in a crinoid meadow
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πŸ‘€︎ u/CrofterNo2
πŸ“…︎ Jun 13 2020
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Could a tetrapod evolve a cartilaginous skeleton?

There are recent studies suggesting that contrary to popular belief, the cartilaginous skeletons of sharks and rays are not an ancestral trait, but a derived one. This is supported by the fact that sturgeons have a cartilaginous skeleton too. It's believed they developed it to control their buoyancy in the water, since they don't have a swim bladder like most bony fish.

I've recently been wondering if it would be possible for a tetrapod to develop such a skeleton, since all of them start out with cartilaginous skeletons in the womb which later ossifies as they develop, and indeed, tadpoles have cartilaginous skeletons as well.

One way I was thinking it could evolve was when I was reading Serina, and Sheather was exploring ways a bird could get around the limitation of calcified egg shells and develop live birth. If a bird lost its eggshell completely, there'd be no calcium for the chick to develop its bones, and thus it would be born with an underdeveloped cartilage skeleton. A lot of birds in Serina have this problem, but they circumvent it by feeding their chicks a high-calcium diet of insects allowing their bones to develop as they grow.

So let's say a type of bird develops soft eggs and later live birth. As I mentioned above, the chicks are born without developed skeletons, and rely on their parents to feed them a high-calcium diet to help ossify their skeletons. This bird later becomes fully aquatic, and they completely give up on ossifying their skeleton and later become what is essentially a shark-bird. Maybe they develop tough keratinous scales all over their body like on their feet to help compensate for their lack of bones for protection.

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πŸ‘€︎ u/SummerAndTinkles
πŸ“…︎ Oct 26 2020
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πŸ”₯ cartilaginous skeleton of a stingray
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πŸ‘€︎ u/CaptainSkull2030
πŸ“…︎ Mar 06 2020
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Found on the coast of the Olympic Peninsula. It was cartilaginous. But what does it belong to?
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πŸ‘€︎ u/purpleheeler
πŸ“…︎ Jan 17 2020
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Female sawfish, a critically endangered cartilaginous fish, will clone themselves when males are absent.
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πŸ‘€︎ u/IchTanze
πŸ“…︎ Apr 13 2016
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Some cartilaginous fishes from the San Francisco Bay
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πŸ‘€︎ u/bayareafishn
πŸ“…︎ Apr 05 2020
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Ancient 420-million-year-old fossil had both bony and cartilaginous fish features. This provides valuable evidence for a common ancestor from which the two lineages split. news.sciencemag.org/paleo…
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πŸ‘€︎ u/BuriesIt
πŸ“…︎ Jan 13 2015
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TIL that humans are more closely related to tuna than tuna are to sharks. The last common ancestor of humans and tuna (and other ray-finned fish) lived 420 million years ago as opposed to 422 million years for tuna and cartilaginous fish like sharks. en.wikipedia.org/wiki/Bon…
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πŸ‘€︎ u/Doglatine
πŸ“…︎ Aug 24 2013
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If a vertebrate by definition has a back BONE then wouldn't cartilaginous fish (like the Great White Shark) be invertebrates?

Wikipedia says cartilaginous fish are vertebrates and its got me f'd up.

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πŸ‘€︎ u/elijahhhhhh
πŸ“…︎ Feb 23 2019
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