What the Hell is Tribrachidium?!
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- เผยแพร่เมื่อ 6 ส.ค. 2022
- One of the strangest Precambrian fossils, Tribrachidium is what we are looking at today. With a radially spiralled symmetry seen only in one other group, but are those groups related? Or awas Tribrachidium so different that it belongs in a totally unique group?
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Love seeing ediacaran animals covered! Theyre so fascinating and mysterious.
I really think that the Cambrian explosion wasn't really so much of an explosion but more of, yeah, what you said, the beginning of a better preserved fossil record. The more I/ the world learns about pre-cambrian life, the more (it seems) like the Cambrian explosion didn't really happen the way we initially thought. It's a shift in, like, preservation bias or something like that. What a fascinating video. I really appreciate your grind to bring us these great paleo videos.
Great video about this cool animal, but disagree respectfully about the significance of the Cambrian explosion. The Cambrian in Chengjiang biota has orders of magnitude more animals than the Vendian/ Ediacaran. Of course, they didn't just appear (unless you are into creationism), so there had to be earlier forms by definition.
I think it's an interesting idea at least. There's still a lot of debate about the different stages of time within the Cambrian, and that extends down to the base of it. So at least some of these fossils may cause us to change the definitions. How much they'll change is going to be something for specialists in those fields to decide though.
That's very fair. I just think that there need to be some better definitions for where the base of the Cambrian actually is, especially as we continue finding more and more evidence of the groups well known in the Cambrian in earlier rocks. It really is a discussion for experts in that time in paleontology and stratigraphy.
Ediacaran paleontology has to be my favorite area of the field. Very glad to see you talking about it :)
There's a lot of interesting stuff. In fact some of the oldest alleged fossils have been found only a few hours from me. But they're also microscopic, so not as exciting to tell about unless I have more time to get multiple examples together.
this guy has interesting topics crazy how small his channel is. I really want to know about the evolution of bones, what the pressures were to evolve those structures and what the earliest evidence of vertebrae were! There’s hardly any videos on this subject even though that’s such a huge part of our history! The fact that there’s still “fish” alive that have NO VERTEBRAE but are classified as VERTEBRATES is nuts to me. Talk about living fossils lol.
Quality over quantity, this channel is top quality 🙏
Thank you!
You might like Aaron Ra _Systematic Classification of Life_ (50 videos)
its not all about dinosaurs.
@@RaptorChatterI can answer that part about the first evidence of vertebrates it’s name is pikaia
I love the grad-school seminar feel to the channel. You let the science speak for itself.
So many popularized channels are too dumbed down and/or sensationalized. For example, how many geology documentaries explain, say plate tectonics, as if none of the viewers ever heard of it before? It's similar with other topics. So many channels where it is always Science Groundhog Day forever locked in the 100-level Intro course.
🍻🌹
Thanks! I really try to explain everything as best as I can
Nice; more about the Ediacaran please.
Really cool animal! Amazing to think how many entire branches of the early tree of life we may not even know about yet because of how poorly some of them preserve!
So much of what we find fossilized is down to sheer luck. And there's so much we don't know because of that.
New dinosaur channel with 4 years of uploads? Time to tell literally everyone I know. Thank you and Godspeed mr dinosaur man
Thanks!
Another astounding presentation on a very obscure Precambrian organism. Love having examples showing life before the "explosion" and way simpler things continuing to show how the earliest animals were VERY simple. "Ya think Noah had these guys on the ark?"
This is one of my favorite things about it, too. It closes fundamentalists’ mouths and really drives home the truth of evolution by natural selection, and the gradual story of life on Earth.
It's clearly some sort of Paleozoic meringue or possibly a pastry of some kind.
Either way, we can be sure it was delicious.
Possibly tasted like sea urchin.
@@RokuroCarisu yes, sea urchin, the chicken of the sea
@@RokuroCarisu I'd say more like a sand cookie
Now that I know,I like these creatures,thx Raptor Chatter
Also hope yall are having a great day
Thanks! Hope you're having a good day too!
I think the real key thing that makes the Cambrian fauna special and distinct is that it's still the period where we start seeing clear cut evidence that predation was becoming a major factor in animal evolution.
It's clearly a precursor to the tripods from war of the worlds
Star Wars reference, SpongeBob reference, what would appear to be a bill wurtz style reference, AND he’s into paleontology? This is my kind of man
Your channel is very good, thanks for the good content!
Thanks!
I'm loving the channel's content, I learn something new all the time. Thank you for what you do!
Are sand dollars related to these guys?? They seem similar to the picture of the group you showed
Sand dollars are echinoderms (i.e. close to urchins or sea stars), which are actually bilaterians.
Sand dollars are really just a kind of urchin, which would make them echinoderms. So they're in that same group as the endrioasteroidea, but a different branch in that group.
As an aside, echinoderms are deuterostomes like vertebrates are, and are believed to have evolved from a bilaterally symmetrical ancestor. Our current understanding is that they're more closely related to us than they are to other invertebrates.
I remember playing SimEarth and finding that Maxis included trichordates simply because they felt sorry for them since they went extinct so early.
🦖😁 Callaghan, A small, prickly Dinosaur discovered in South America reveals an unknown lineage, meet "Jakapil Kanikukura".
Yep, It's already on my list of things for August!
The simplicity is staggering.
i am very much enjoying this series
Trichordates have evolved.
Trichordates are now sentient.
I have been wondering forever what the trichordates from Sim Earth were based on.
I think one of the biggest questions the discovery of The Ediacaran Biota was "Was there an end Ediacaran mass-extinction, if there was, how bad was it?"
You talking about needing a new phylum got me thinking again about the protists. I've always seen Protista as "the bottom drawer of the filing cabinet where we throw all the things that don't fit in Animalia, Plantae or Fungi"... sorry... bit of a non-sequitur, but it does bother me.
Callaghan, a paper in 11 August 2022, T-Rex’s unusual eye sockets helped it evolve a powerful bite.
The Skredunkulous Phylum. 😆
Lippity Kip! Lippity Kip!
My only names is Precambrian Pip!!
Hallo, this Video was one of your best!
Ediacaran fossiles are so much interesting, and I hope that they will discover many more in the next years...
But did you ever think about a Video about hyolithes?
The Hyolithes are another strange kind of paleozoic animals, were I could think to myself, "what the hell is this...?"
In my older paleo books from the last century the paleontologists say that hyolithes were a strange kind of molluscs, that had died out in the Permian.
And today Wikipedia and others tell me, that they rather belong to the annelide worms.
What do you think were the hyolithes belong to?
Best wishes to you and your channel from Germany!
It would certainly be an interesting group to look into more. So I'll add it to the list!
Dang he really managed to go the whole video without saying “ediacaran”
well done!
Great Video
Thanks!
What a weird and wonderful critter! The fossil's kinda neat too. ;D Never heard of it, but that's a pretty triangular symmetry it's got going on. -- Early evolution seems to have thrown everything at the dart board to see what would stick, at random. So why didn't more of these survive? Or did they, and we just don't know how they evolved in the interim?
Ben, did you ever hear about the very small and simple organism named Trichoplax?
It was first discovered in the 1880s, but a long time it was thought to be a planula larvae. Then in the 1970s Trichoplax was discovered to be an unknown organism of the new discribed kingdom of the Pacozoa.
Trichoplax and the two known other types of Placozoa have only six different types of cells, and the way of feeding itself could be the same way some Ediacara animals like Tribrachidium or Dickinsonia did have.
I would like to see a movie here about the Placozoa, think it would be very interesting!
Is it possible that Tribrachidium had cilia facilitating water flow in feeding?
Maybe, but probably not. If there were cilia we'd expect to see some trace marks of them in the fossil impressions.
A good comparison would have been sponges.
very interesting channel - kudos for Ezekiel O’Callaghan for creating this channel
You know, the creature that was talked about in this video (Tribrachidium) reminds me of sandoloes. Specifically it's inner shell... Are these two related?
Edit: So turns out sandoloes are a species of urchin... still makes me wonder if Tribrachidium
is somehow related to this group or not...
also for some reason when I type sand dollar or Tribrachidium, the computer thinks it's spelled incorrectly.
Well, reconsidering the Cambrian is kind of a moot point, as it's not defined at this point by the appearance of large organisms (large here meaning macroscopic).
Instead, the start of the Cambrian is defined by the FAD of Trichophycus pedum; this also defines the start of the Fortunian stage of the Terreneuvian Series.
What should be reconsidered though is the start of phanerozoic life: should we include the Ediacaran? Or not? Whichever is the case, why?
I'm not an expert on Cambrian or Ediacaran stratigraphy so that is probably the more accurate way to define it thanks!
What the hell is Saccirhytus?
So, basically, the bathtub drain evolved in the Precambrian
I want to take that picture and claim a 20000 year old shower drain has been discovered
Scale ?
In general they're not very large. The biggest get up to a few inches, or about 4ish cm, but there are also fossils of smaller ones.
@@RaptorChatter thanks. I always included a lens cap or my compass with the ruler edge, on pictures I took! Precambrian fossils are the strangest. Smiles
Heheh..Dickinsonia
Curious why you talked around the word “ediacran” for the whole video
So because the animal is so different from everything else, I wanted to focus on that rather than trying to explain all the stratigraphy, and worrying about definitions surrounding the start of the Cambrian and whatnot. I think for explaining the organism emphasizing the Ediacaran wasn't as important as just getting across the idea of it being before the Cambrian explosion.
Snails have a spiral shape and they don't use the shape to filter feed. I mean, why does a clam shell have ridges? Don't know. Why a snail a spiral and not something else? Don't know. They r saying there's a reason for these creatures but all animals have evolutionary reasons but they are too sutble for us to easily understand and this "bizarre and totally unique" feeding theory seems heavy handed. When they know why every type of snail shell is a slightly different shape , some are more pointy, different colours etc, then I'll take their hypothesis more serious. Interesting video even so.
For this animal it is specifically because we get the molds of the fossils on the bedding planes of the rocks. So they sat flat on the rocks. The additional hydrodynamic studies suggest that water was stopped over what would be the mouth regardless of direction of the water.
I wonder how Sonia felt about that Dickinsonia
Regarding Dickinsonia. Was Sonia a consenting adult?
Ukraine is pronounced with accent on the SECOND syllable, NOT the first
My guess on the pronunciation: brach with a short A, not long A. /try-brack-id-ee-um/
It could be. I think of it as coming from arm, which I immediately think of the brachioradialis muscle, which I've always hear pronounced the same way I did in the video, so maybe it's also just an accent thing to where I learned it.