Im liking the new style guys. The small mix of comedy into the knowledge is not only refreshing, as a science nerd I feel like it helps people who are here learning for the first time feel more comfortable and open to learning. So keep it up guys! Y'all are a great channel.
As a geology student, putting the line of symmetry down the middle of the bivalve instead of inbetween the shells hurts me a little bit, because its the main way we distinguish between bivalves and brachiopods
Especially since scallops are the only ones symmetrical along that axis. Mussels, oysters, and a lot of clams certainly aren’t. Of course, it doesn’t help that oysters and many scallops are not completely symmetrical between the valves, either, at least their shells aren’t.
@@ajchapeliere I'm talking about in fossil specimens (there are much easier ways to tell in living ones), and I know in some other places Palaeontology is considered completely separate, but in the UK its a subset of Geology
The wandering head idea reminds me of the one type of vampire which looks human by day, but by night its ears turn into wings and the head flies around looking for a meal.
I remember hearing or reading about certain tube worms that have no digestive system. Not even a mouth or anus. They live near volcanic thermal vents and absorb nutrients straight through their skin.
@@rateeightx Close. I looked it up, they don't actually digest the bacteria; they form a symbiosis. The tube worm provides the bacteria hydrogen sulfide and a safe home and in turn the bacteria produces food for the tube worm which, I suppose, just enters the bloodstream. oceanexplorer.noaa.gov/explorations/02mexico/background/tubeworms/tubeworms.html Sometimes real life is stranger than science fiction.
There are some other annelids which are missing a digestive system too. The female Osedax lacks a digestive tract, including a mouth, gut, and anus. And the genus Olavius. And some echinoderms called sea daisies (Concentricycloidea).
7 หลายเดือนก่อน +2
Some internal parasites also don't need a digestive system.
It's likely been both the whole time. TH-cam has a new feature for creators where they can upload two thumbnails and TH-cam will show both of them, depending on which they think that specific user (you) will click on. It can also change between the two if you've not watched the video and the algorithm has updated data that shows similar users responded to the other pic.
It reminds me of a cartoon by James Thurber, who was going blind at the time. He was going to draw a sofa with a couple sitting on it but ended up with a rhino with its head turned.
Thats a parasite mutating their host (changing phenotype/ physiology). I would not call it evolution. Also it was a great practical effects horror / thriller movie :D
@@AidanRatnage I suspect they meant something like torso, rump or upper body, but I'm not entirely certain. And you're right, I didn't even realize they defined what a head is, even though that one is much less ambiguous
They meant that they lost their thorax/abdomen and where the legs are attached is basically an extension of the head as compared to related animals. But that doesn't really explain the internal organs...
@@EmpressLizard81They have very few organs. They do not have a heart or circulatory system, nor lungs or respiratory system, they do not a stomach, BUT they DO have an esophagus and intestines. Remember they're microscopic
I already knew that echinoderms are deuterostomes, but it's still wild to me that we have more in common with them (evolutionarily) than we do with insects.
Loved this collab (and the newer change in content format in general). I didn't know about all of those sister channels, so I love being introduced to more amazing content.
I was expecting to see tunicates on the list. They are some of the first chordates diverge from the rest of us. Their larval form is basically a free swimming fish, but when they mature they metamorphosize into basically a sea sponge and lose the ability to move, their heads and limbs, and most of their nervous system.
Makes me wonder if tunicates are the way life was meant to be but chordata just so happened to be stricken with a form of neotony that keeps the nervous system. Still, that's a horrifying thought - to know that you will basically lose all mobility and most of your sentience going into not old age, but simple adulthood. What a mercy they aren't sapient....I think.
Each of your videos generally prompts a flurry of wikipedia-browsing in me, leading me off on many diverse tangents and fascinating side quests. And people wonder why my head is stuffed with the most obscure and esoteric knowledge from all kinds of disciplines...
9:04 actually Chordata is animals with a central nerve chord (and some other features), not animals with a spine. Chordata also includes the tunicates which do not have spines. animals with spines are in the subphylum Vertebrata. sorry, I am very annoying
Yeah. No love for the the tunicata and the class myxini (hagfishes), even though they lost their spine. I don't think you are annoying. You are rather rightfully annoyed.
I thought you guys would talk about that fly that is parasit of hornet bee, i guess. The femeal is always atached to the host, under its wings. They are completly buttless and the fecundation occure in the mouth
Its probably worth noting that radial symmetry as seen in cnidarians is actually a prerequisite for bilateral symmetry as it has evolved at least twice in bilaterians and anthozoan cnidarians from duplicating the HOX gene pathways used to create the 1 dimensional radial body axis of most cnidarians(excluding Hydrozoans which lost the HOX gene body axis thing altogether because nature always throws you curveballs). Imagine having neurons control the cellular differentiation patterns directly rather than every cell doing it based on their position in the embryo despite not having a centralized nervous system, that is at least how hydras do things.
(eagerly raises hand) Ooh ooh ooh!! As I read the title and listen to the intro, I'm hoping they'd bring up sea squirts! I'm still in awe of how they're supposedly more closely related to us than a lancelet, implying that a free swimming chordate at some point found it more advantageous to stick its head into a surface transforming their adult stage into something that we may easily mistake for a sponge or sessile cnidarian
Aww, you folks left out the weirdest group. Placozoans. They're microsopic amoeba-like blobs, but they are indeed very basal animals, sitting somewhere between sponges and jellies on the evolutionary tree. They're wholly lacking muscles and nerves, but have genes related to both. It's unclear if these were predecessors to animals with nerves, or of they lost their nervous systems somewhere along the line. There are also tunicates, many of which have nervous systems in their larval stage, but lose them as they mature and become sessile.
I can never get over scallops being these eldritch maws of hundreds of eyes and tentacles. They just look straight out of a cheesy horror movie. I love them
I just love how much genetic research has been done on species since I started watching documentaries on TV as a kid. There's so much new information that I keep finding out about every year now.
That was a cute little intro! I think the most basic thing a creature would have to have would be "an orifice" at that level, it's probably of the multi-tool variety
Point of order: The diagram dividing the scallop shell into "left" and "right halves is incorrect. Bivalves are organized such that each valve ("shell") is on either the right or left side of the animal, not the top and bottom as seems obvious from looking at how most of them orient themselves. Most of them are, in fact, lying on their sides😊
Come to think of it, WHY is it that our sensory systems and our central processing facility are collocated? Sure, there are a whole lot of good evolutionary arguments like sensory organs requiring lots of nerves, short neural paths to the central brain and such, but there is a definite survival advantage to remote sensing facilities at the extremities and a well protected central brain in the body center. Just imagine a soldier being shot in the head, turning to his squad mates saying, "Sniper is on the left, behind the burned-out truck. Also, ouch, medic! Somebody else can stick their sensor pod out next, I've only three left as it is"
@@marilynlucero9363 I am sofa king grateful for your comment; I thought I was losing my mind! I could have sworn I saw something different a moment ago! 😂
There's a salmon parasite that lost their mitochondria. H. zschokkei is notable for its lack of mitochondria, mitochondrial DNA, aerobic respiration and its reliance on an exclusively anaerobic metabolism. --Wikipedia
I gotta say I'm absolutely loving the refreshed style on scishow, it's great and the slightly longer videos and new hosts are great too!
They couldn't stand much longer, now that they have chairs they can do 15 minute episodes 😂
Very much same. Very cool. Much more laid back. Love it.
It's my favorite clown show
same, i love how comfy the new living room background makes the videos look!
I’m happy for the people who are happy, but to be honest, I miss the more frenetic, energetic style.
A lot of people I’ve encountered never really progressed past the early stages of being a deuterostome.
Ya...They are also know as Republicans.
@ArchFundy
Don’t bring politics to Scishow, please!! Even though I agree with you lolll
Some i know are multi-butts!
This coming from a starfish lefty...
Huur hurr hurr a joke like that's never made before
What a fun crossover! Seems like Complexly is digging into more complexity with production!
stefan got comfy on his couch and summoned 3 juniors to take over xD
Im liking the new style guys. The small mix of comedy into the knowledge is not only refreshing, as a science nerd I feel like it helps people who are here learning for the first time feel more comfortable and open to learning. So keep it up guys! Y'all are a great channel.
As a geology student, putting the line of symmetry down the middle of the bivalve instead of inbetween the shells hurts me a little bit, because its the main way we distinguish between bivalves and brachiopods
THANK YOU i was like how did u not split it the most obvious way
Especially since scallops are the only ones symmetrical along that axis. Mussels, oysters, and a lot of clams certainly aren’t.
Of course, it doesn’t help that oysters and many scallops are not completely symmetrical between the valves, either, at least their shells aren’t.
I mean, brachiopods have holes in the shell. I’d think that’s a pretty easy way to distinguish them.
Can you explain the geology aspect of your comment? I feel like I'm missing the connection.
@@ajchapeliere I'm talking about in fossil specimens (there are much easier ways to tell in living ones), and I know in some other places Palaeontology is considered completely separate, but in the UK its a subset of Geology
...so no head?
[Tartagrades has entered the chat]
I understood that reference. *Proceeds to stomp on a skateboard*
I didn't even watch the video, I just ran straight to the comments SPECIFICALLY for this!
No head 😢
Sometimes you just want to get down to business😉
The wandering head idea reminds me of the one type of vampire which looks human by day, but by night its ears turn into wings and the head flies around looking for a meal.
I remember hearing or reading about certain tube worms that have no digestive system. Not even a mouth or anus. They live near volcanic thermal vents and absorb nutrients straight through their skin.
😮😮😮😮😮
If memory serves, Don't they have bacteria growing within them, that consume the nutrients before being digested by the tube worms?
@@rateeightx Close. I looked it up, they don't actually digest the bacteria; they form a symbiosis. The tube worm provides the bacteria hydrogen sulfide and a safe home and in turn the bacteria produces food for the tube worm which, I suppose, just enters the bloodstream.
oceanexplorer.noaa.gov/explorations/02mexico/background/tubeworms/tubeworms.html
Sometimes real life is stranger than science fiction.
There are some other annelids which are missing a digestive system too. The female Osedax lacks a digestive tract, including a mouth, gut, and anus. And the genus Olavius. And some echinoderms called sea daisies (Concentricycloidea).
Some internal parasites also don't need a digestive system.
Dude, that starfish thumbnail was already great. This headless rhino is just macabre.
It's likely been both the whole time. TH-cam has a new feature for creators where they can upload two thumbnails and TH-cam will show both of them, depending on which they think that specific user (you) will click on. It can also change between the two if you've not watched the video and the algorithm has updated data that shows similar users responded to the other pic.
It reminds me of a cartoon by James Thurber, who was going blind at the time. He was going to draw a sofa with a couple sitting on it but ended up with a rhino with its head turned.
@@SavageMinnow Good to know.
@@sophierobinson2738 this is a tiny part of a person’s story I never would have thought to learn. The world is bafflingly big
@@AnkhAnanku This is a cool comment. Thanks for the refreshing positivity, and rightful awe.
"Multi-armed head" brought back memories of John Carpenter's The Thing. Evolution was a bit faster in this case though.
Thats a parasite mutating their host (changing phenotype/ physiology). I would not call it evolution. Also it was a great practical effects horror / thriller movie :D
Really? That description brings Krang and Utroms to my mind instantly.
i was thinking of Davy Jones from the pirates of the caribbean
@@kleinerprinz99 It's shown killing other lifeforms and mimicking them, not infecting hosts. We might speculate that it is a parasitoid though.
@@alveolate Did he poop out the top of his head too?
I think the number one thing I’ve learned from this episode is that I never want to step into the ocean ever again.
Maybe do a little wading, but any farther….No!
The deadliest thing in the ocean, by far, is the water.
@@sophierobinson2738 You hear people argue a lot about row versus wade these days, but I think it all depends on how deep the water is.
'Attack of The Ambulatory Head' - In theaters this Summer.
A few years ago I saw an old black and white movie, "The Crawling Eye". It's comedically bad
@@BionicMilkaholicThe one with the invisible flying brains got me. (They were visible under certain circumstances.)
For a lot of sea creatures, those ambulatory heads are terrifying. Do you know how starfish eat?
Starfish are just mouths with tentacles.
Your mouth has a tentacle too, called a tongue.
(Don't ruin it with definitions.😆)
The most mysterious part of the video was what you mean by an animal losing its body. First I thought: "Are we talking about ghosts now??"
Same, I still don't know what they meant, they defined a head but not a body.
@@AidanRatnage I suspect they meant something like torso, rump or upper body, but I'm not entirely certain. And you're right, I didn't even realize they defined what a head is, even though that one is much less ambiguous
They meant that they lost their thorax/abdomen and where the legs are attached is basically an extension of the head as compared to related animals. But that doesn't really explain the internal organs...
@@EmpressLizard81They have very few organs. They do not have a heart or circulatory system, nor lungs or respiratory system, they do not a stomach, BUT they DO have an esophagus and intestines. Remember they're microscopic
Im glad Scishow can still conjure up Great and Original Videos after so many years! I love to see the hosts interact like that. Very funny 😊
Im really enjoying the laid-back atmosphere at scishow and todays episode was an awesome collab of 4 of the best channels. ❤
The new format is wayyy more entertaining, may the algorithm gods bless Scishow!
I always assumed that molluscs _with_ heads and molluscs _without_ heads evolved from a common, headless ancestor. Learn something new every day.
I already knew that echinoderms are deuterostomes, but it's still wild to me that we have more in common with them (evolutionarily) than we do with insects.
Dang evolution, tricking us once again
Stefan's acting in this was great. The personality in the script is also really good and refreshing.
Good to see Eons here! A big fan of it!
Also good to see a Collab between some of my favorite channels!
I've never had such a strong feeling of joy accompanied by such a strong thought of "these guys are dorks," please never change, it's delightful
I love this collaboration so much ❣️ We definitely need more mashups between the completely channels!
I enjoyed and would love to see more episodes of Bizarre Sci Cosmo Eon Show
+
great colab! very interesting stuff, thank you :)
These episodes keep getting better and better! Whatever you guys are doing, keep doing it. I LOVE all your channels.
It is so sad that this is the last year of Journy to the Microcosmos.
Seriously? Why?
I'm going to accept this as my most-wanted Bizarre Beasts episode for tardigrades
Loved this collab (and the newer change in content format in general). I didn't know about all of those sister channels, so I love being introduced to more amazing content.
I was expecting to see tunicates on the list. They are some of the first chordates diverge from the rest of us. Their larval form is basically a free swimming fish, but when they mature they metamorphosize into basically a sea sponge and lose the ability to move, their heads and limbs, and most of their nervous system.
I was thinking about that too.
Great comment and great user pic :)
Makes me wonder if tunicates are the way life was meant to be but chordata just so happened to be stricken with a form of neotony that keeps the nervous system.
Still, that's a horrifying thought - to know that you will basically lose all mobility and most of your sentience going into not old age, but simple adulthood. What a mercy they aren't sapient....I think.
in re. tardigrades and minified body plans, parasitic wasps (megaphragma mymaripenne, for instance) have impressively /scrunched themselves down/
4:07 Oh wow I never knew about those eyes. That's strangely terrifying to me.
loving the collabs ♡♡ always excited to find a new sister channel to follow!
Each of your videos generally prompts a flurry of wikipedia-browsing in me, leading me off on many diverse tangents and fascinating side quests. And people wonder why my head is stuffed with the most obscure and esoteric knowledge from all kinds of disciplines...
I know there's debates about where sponges fit into the animal tree, where depending on what's right could mean that sponges lost a *lot*
6:15 never seen that in my life but immediately makes sense that’s the water bears cousin with his cute little feet.
And now, "happy as a clam" maybe come back in full force!😂🎉
Great crossover!❤
it's the cambrian explosion
The sun is a deadly lazer
The "Come on!" moment was perfectly delivered, I thoroughly enjoyed the intro :) 🤣
woahhh i've never been this early to an upload !
I can't believe they chose this grotesque thumbnail over the starfish.
Loving this new delivery style. Feels classy and engaging and everyone looks super chilled out
You're right, "how animals lost their bodies" wouldn't sound right, perfect title as always
"Being a bivalve sounds pretty chill." Yea, until you find yourself at THE OYSTER BAR!
Doesn't mermaids eat them too?
6:09 aww why is it so cute
bivalve life sounds sweet, where do i sign up?
What a mash up. All my favorite channels. On one episode 😍
You know its gonna get crazy when the video starts with a definition of what a head is.
This cross over is so fun!
9:04 actually Chordata is animals with a central nerve chord (and some other features), not animals with a spine. Chordata also includes the tunicates which do not have spines. animals with spines are in the subphylum Vertebrata.
sorry, I am very annoying
Yeah. No love for the the tunicata and the class myxini (hagfishes), even though they lost their spine. I don't think you are annoying. You are rather rightfully annoyed.
Kipling: If you can keep your head ...
Bivalves: No thanks!
Great show!
A long time ago I saw a story about a chicken that lost its head and lived a a pet for quite a while
Evolution is all about survival of the sufficiently fit.
Survival of the doesn't need to work out.
Aww I love Eons too! Lol love this collaborative video. Always a good watch, so interesting 🤌
I thought you guys would talk about that fly that is parasit of hornet bee, i guess. The femeal is always atached to the host, under its wings. They are completly buttless and the fecundation occure in the mouth
I'm so glad they're finally letting you guys sit down after all those years trapped in the scishow studio
Its probably worth noting that radial symmetry as seen in cnidarians is actually a prerequisite for bilateral symmetry as it has evolved at least twice in bilaterians and anthozoan cnidarians from duplicating the HOX gene pathways used to create the 1 dimensional radial body axis of most cnidarians(excluding Hydrozoans which lost the HOX gene body axis thing altogether because nature always throws you curveballs). Imagine having neurons control the cellular differentiation patterns directly rather than every cell doing it based on their position in the embryo despite not having a centralized nervous system, that is at least how hydras do things.
I want four more brains.
I was JUST hoping for another PBS Eons episode… and then the crossover happened!!!
A curse upon your thumbnail!
“Who needs the rest when you can have a multi-armed head?” Sounds like a good intro to cosmic horror body gore 😅
I thought this was going to be about Mike the Headless Chicken.
Cool format! Neat to see other hosts/channels featured.
(eagerly raises hand) Ooh ooh ooh!! As I read the title and listen to the intro, I'm hoping they'd bring up sea squirts! I'm still in awe of how they're supposedly more closely related to us than a lancelet, implying that a free swimming chordate at some point found it more advantageous to stick its head into a surface transforming their adult stage into something that we may easily mistake for a sponge or sessile cnidarian
Barnacles found it advantageous to stick their heads to a surface as well. I wonder how many other times that's happened?
Wow, all three are disturbing in the best of ways.
Thank you all!!!
So no head?
*breaks skateboard*
Wow, the mirror line drawn on the bivalve was a huge mistake, tha symmetry axis(plane) is between its wo halves, not like on the picture
Yeah, it's not a brachiopod.
I love the way sci show presentation style has Evolved. :).
10:16 That must definitely be the inspiration for Patrick Star :D
Even the scientific name is similar.
Aww, you folks left out the weirdest group. Placozoans.
They're microsopic amoeba-like blobs, but they are indeed very basal animals, sitting somewhere between sponges and jellies on the evolutionary tree. They're wholly lacking muscles and nerves, but have genes related to both. It's unclear if these were predecessors to animals with nerves, or of they lost their nervous systems somewhere along the line.
There are also tunicates, many of which have nervous systems in their larval stage, but lose them as they mature and become sessile.
Indeed, and thanks for info about that Placozoa.
Really like that the sister channels get to have a get together to feature in one video, getting some of the attention they deserve as well.
Avengers level crossover from all of my favorite channels. Genuinely made me smile. Thanks for this!
Nice collaboration
I can never get over scallops being these eldritch maws of hundreds of eyes and tentacles. They just look straight out of a cheesy horror movie. I love them
I just love how much genetic research has been done on species since I started watching documentaries on TV as a kid. There's so much new information that I keep finding out about every year now.
That was a cute little intro! I think the most basic thing a creature would have to have would be "an orifice" at that level, it's probably of the multi-tool variety
Really love this episode format❤
Point of order: The diagram dividing the scallop shell into "left" and "right halves is incorrect. Bivalves are organized such that each valve ("shell") is on either the right or left side of the animal, not the top and bottom as seems obvious from looking at how most of them orient themselves. Most of them are, in fact, lying on their sides😊
True. But brachiopods have that one tho. But they are something completely different.
@@turkoositerapsidi Yep. But they're such an obscure phylum I didn't think I'd need to mention them🤪
@@scibear9944 You didn't need, but I wanted to. 🙂
I really love the new set. Sitting down presenting is a lot nicer actually!
Nice mashup of SciShow and sister sites 🤓👏👏👏
I’m geeking out at this cross over, I watch all of these channels religiously 😂
The second chapter is called "Bvalves". Probably meant to be "Bivalves", right?
Such a good vid!
I saw this title and was like _please talk about the new starfish discoveries._ Happy to see that you did! :D
Come to think of it, WHY is it that our sensory systems and our central processing facility are collocated? Sure, there are a whole lot of good evolutionary arguments like sensory organs requiring lots of nerves, short neural paths to the central brain and such, but there is a definite survival advantage to remote sensing facilities at the extremities and a well protected central brain in the body center. Just imagine a soldier being shot in the head, turning to his squad mates saying, "Sniper is on the left, behind the burned-out truck. Also, ouch, medic! Somebody else can stick their sensor pod out next, I've only three left as it is"
10:15 it’s called dactilophatagium!! Finger wing webbing
Love the new look and format
The plane of symmetry of the bivalve seems wrong at 1:54... Great video though!
Yeah
Loving the collaboration and loving seeing women representing in science. That being said, see Stefan ALWAYS makes me happy.😊
I loved the intro! Wonderful little skit :D
So tardi grades found a genetic way to become chibi versions of themselves
I love a good crossover!!❤
02:38 - Does anyone recognise what species of nudibranch is this?
Seeing Callie in the thumbnail, immediately watches video
They just changed it, but I agree though, lol
@@marilynlucero9363
I am sofa king grateful for your comment; I thought I was losing my mind! I could have sworn I saw something different a moment ago! 😂
That’s a headless rhino Bro
@@jeaniebird999 it's the TH-cam meta now, they will have 2 or 3 thumbnails and swap them out in the first hour to see what pulls the most engagement
I thought we were calling someone a headless rhino. Was harsh bro haha
There's a salmon parasite that lost their mitochondria.
H. zschokkei is notable for its lack of mitochondria, mitochondrial DNA, aerobic respiration and its reliance on an exclusively anaerobic metabolism. --Wikipedia
Wow, and that one is multicellular! I had only known of Monocercomonoides.
Oh hey Kallie, be watching that channel later😂
nah y'all KNEW what y'all were doin' with the caption on the thumbnail LOLLL 😂
That premise! 🤣Well done! 👍
I thought bivalves are technically just one big head, or mouth rather?
Loved the video as always!! may I ask what is the first song that plays?