All I know is that I am amazed that all these exoskeletal segmented creatures diversified in form so much; millipedes crabs, shrimps, lobsters, arachnids, all the myriad insects, lice, ticks, you name a niche, they are there. All variations on the "make segment with appendages, make another segment but vary it a bit" genetic pattern. It makes an obvious parallel between genetics and software, IMO.
Interestingly enough, insects themselves were recently found to be taxonomically nested in Crustacea. Meaning every insect, such as the fly, butterfly, cicada, roach, ant, beetle, & mantis are crustaceans. Here I thought crustaceans were already diverse enough.
@@i.m.evilhomer5084 Arachnida??? so obvious, right? scorpions and spiders are land cra..... lobs.... uh... well the whole family can still get along for thanksgiving, if they're not vegan (they're not)
@@willisgemutlich2608 Arachnids are actually their own separate lineage being the first of the major extant groups of arthropods to split off on their own back in the Cambrian. Technically arachnids are still listed as chelicerates but recent phylogenetic evidence makes the grounds of that classification murky as one of the major groups of animals horseshoe crabs (order Xiphosura) has recently been found to be a sister group to the hooded tickspiders(order Ricinulei) which is also supported physiologically in effect also supporting Carl Linnaeus's original assessment on relatedness. As the Rincinulei are nested deep into the arachnid family tree this implies they must be arachnids and as Eurypterids have long been known to be related to both groups likely implies they too were true arachnids in which case several definitions namely those which place sea spiders outside that grouping the clade of Chelicerates may be identical to arachnids or alternatively most arachnids ,including scorpions, spiders, camel spiders, harvestmen etc. must be reclassified not unlike the situation with crustaceans. moreover the type of UV fluorescence appears to be a basal characteristic of the clade with all known arachnids displaying some degree of UV fluorescence, interestingly at least sometimes even including their fossils which makes sense since the feature is derived from the crystalline structure of the cuticle. More interestingly phylogenetic estimates indicate the most basal members of the arachnid family tree are the numerous tiny arachnids referred to as mites. given that many are inhabitants of wet soils I wouldn't be surprised if these organisms adapted to that way of life feeding off the fungi cyanobacteria and any green algae that wound up on the shore or intertidal environments. Of course The origin of Myriapods is also extremely mysterious with their first fossil evidence already showing that centipedes and millipedes had already diverged by then and had become well adapted to terrestrial ecosystems. In fact to date no marine fossils exist of Myriapods despite molecular clock estimates strongly suggesting the order arose in the Cambrian. Given that many myriapods are subterranean in nature and have been found living deep deep underground I wouldn't be surprised if they may have originated as subsurface early terrestrial colonizing arthropods which ventured on land hiding from the UV radiated landscape by day and feeding by night or something similar. Where there is food and water there is life and while an ultraviolet irradiated landscape is a harsh environment it would be an effective way to avoid the extreme competition within the Cambrian seas.
Some suggestions for future videos that I'd want to see are: Guiyu oneiros (the earliest known bony fish) Nochnitsa geminidens (a small gorgonopsid adapted for a nocturnal lifestyle) Anteosaurus magnificus (the largest land predator of the Palaeozoic) Effigia okeeffeae (a shuvosaurid known for its unique feeding habits) Neptunidraco ammoniticus (one of the oldest and best preserved metriorhynchids) Brachytrachelopan mesai (a sauropod unique for its very short neck) Mauriciosaurus fernandezi (the best preserved polycotylid, with a nearly complete skeleton and some soft tissue being preserved) Microleo attenboroughi (a tiny, basal species of marsupial lion) Gnatusuchus pebasensis (a brachycephalic, bivalve-eating caiman with a shovel-like mandible) Llallawavis scagliai (a small phorusrhacid, though it's the one with the best preserved skull)
I just love the term "Cretaceous crab revolution" Would love to learn more about this, any good (general) sources? Or would this be a suitable for a future video?
so, due the the vast multitude of colorations in modern crustaceans, I would love to see the rainbow of colors that they may have had. Is there a way to determine that with chemical composites of fossils? Physical chemistry? That seems insurmountable with all the variants of the lobster or crab family now, with some having stripes, dots, spikes, enlarged claws or not, etc. Same with dinosaurs. Feathers or scales? Cross? Sharks don't have scales but a layer of small teeth, with the ability to heal them all. Is there something in this? It will be cool when our fossils start giving us more and more information. I have some weird fossils I'd love to send you pics of if I can figure out how to do that, but I'm not very good at this computer stuff anymore. I'll have to go find some pics first too, but we're talking clams for the most part, from a prehistoric river delta. my neighbor at the TOP of the hill had a beautiful river dolphin displayed in his living room, FULL, and someone broke in and stole the head. Our unique characteristic is that it's SAND, like fine building sand, and we're basically on ancient sand dunes as well. The soil and topography are dunes that were once submerged. The fossil fragments I have littered about are all pure white, loose, separate chunks of these "worms", I'm fairly certain they are actually clams of a funny sort. The clumps aren't fractional, they're very much conglomerate, so we never try to cut them. You'd lose the kerf. it would be cool to see what those clams (the big ones, 3-5 inches) were eating with some modern tech. River delta means brackish which means best and worst of both worlds meeting. Edit this, please, or keep it just for yourself.
That's fascinating stuff, thanks for sharing. Sad to hear about the dolphin. I still think it's wonderful that you have so much first hand experience with all of that.
I found the part about predatory arthropod eye adaptations very fascinating. People, including myself, sometimes forget just how effective they are as predators.
Yep Odonata for example are one of the few animals that in addition to tracking prey actively compute intercept trajectories towards prey. This is made all the more impressive since it is done in 3D motion and time with complex hovering maneuvers and turns which mathematically requires full quaternions to model successfully without the mathematics going singular suggesting they are doing something analogous to full quaternion calculations inside their little insect brains.
Thanks for this perfectly timed video! Just a few days ago I decided to keep crustaceans again: I got a tank intended to become an aquaterrarium for a group of mangrove crabs and dwarf shrimps, and a friend gifted me a terrarium which will be the home of a group of exclusivly land dwelling (and even arboreal) vampire crabs. Can't wait to set everything up and let it run in before the new inhabitants arrive. 😁
Callichimaera reminded me of the Silverswimmer from the speculative documentary "The Future is Wild". Silverswimmers are a group of fish-like crustaceans that were descendants of free swimming crustaceans that bred in their larvae stage in a extreme case of neoteny. Not the first time TFiW "predicted" something like this. They also predicted the flightless Jamaican caracara & four-winged Microraptor through the Carakiller & Great Blue Windrunner. The Spitfire Beetle arguably counts too, the modern Epomis ground beetles also uses mimicry to hunt their predators, although they hunt frogs instead of birds.
Terrific video, great job describing, explaining and contextualizing the fossil, the creature and the Era that gave rise to it and its brethren. The visuals and narration are top quality and informative. I am very curious about the recurrence of the crab form & fascinated by all the morphological variations!
You oughta create plushies that look like these cute, big-eyed swimming crabs. If they were still alive today I think they'd make great salt water aquarium pets, though I reckon you'd need a relatively large tank to allow them to swim around.
I.e, if I was to take ME, fully fossilized, and try to cross section my fossil, with a 1 mm blade to examine everything, you would still lose a bladewidth for every cut. I hope we come up with a better way soon, as well as chem analysis and dating things... I'll keep watching, you keep sea-i'n, and I'll sea you next week!
Ten years ago i was fishing with a friend in a murky water port, he catched something strange and he start crying like a little girl... scared by the thing he fished and begging me to take off the hook... (courage is never been his best). Annoyed i come to help him and I saw it was some kind of strange crab; it had very long legs and it was quite big, the animal was like 30 cm in diameter but, what really striked me was the shape of that legs, they were flat and similar to some kind of fins. I know very well about crabs with paddles, i catched a lot of them in my life and that thing was different; it had 4 or more finned legs and its torax had an oval, some kind of hydrodynamic shape. I took off the hook and freed it in the water, it started to swim forward, elegantly moving in alternately way its 4 finned legs... just like a 4 finned sea turtle. It swimmed near the surface for 10 or more seconds then it dived, disappearing in the murky water. I never saw something like that after, i searched on the web and asked to my professors in university (i'm graduating in biology) but i never found out what it was. EDIT: My theory is it was some kind of pelagic, swimming spider crab (Majidae family); because the torax and the cephalic region was very similar to that of them and, on more... my fishing friend was scared not by the oddity of the animal but... just because he thought it was a spider crab (he is hella scared by spider crabs XD). BTW I've never heard about free swimming spider crabs and i never saw a crab swimming in that way; it intrigues me thinking it can be some kind of rare and still undiscovered species, afterall seas are full of incredible and wonderful alien-looking animals and many of them still being discovered day by day. The port in question is full of large fishing vessels, maybe one of them caught it with deep nets offshore, and then threw it back into the water, during fish processing operations in the port; just a theory. In any case the animal appeared unharmed and healty, infact it deliberately ate the bait instead of passively being caught by the hook.
@ 3:45 In the speculative evolutionary biology series "the Future is Wild" , 200 million years in future the fish were wiped out in the oceans and crustaceans took their place by becoming nektonic via neoteny.
Whats striking to me is how many family-level groups of brachyurans have gone extinct 11:12, in addition to some deeply branching lineages that nevertheless survived to the present..most of those extinct clades don't even have Wikipedia pages, would be interesting to see a video on them, what they looked like, when they went extinct and possibly why..
The reconstruction looks like the larva of a crab, that quite interesting. I've only seen a few fossils and their reconstruction that show a similar form of their descendants' offspring or larva in this case to look like their ancestor. Edit: you mentioned it. It's as though neotony is a common theme...
@@HenrythePaleoGuy So was this video! Crabs in all their forms are fascinating creatures, and I love the different ways vision evolves in various animals. Would have loved to see this guy alive!
crabs are so weird. so many are from totaly different families but have adapted the body plan. kinda like peccaries.they look like pigs but are something totaly different😂
Callichimaera bauplan looks kinda like a larval crab of today…ontogeny replicates evolution once again? Edit: oh you were just about to talk about that
Not set in stone eh? Seems like many of the fossils *are* set in stone. You didn't say "pardon the pun" or "no pun intended". LOL Algorithmic assistance is the only reason to make this comment. ~ 2:43
Your material is good and interesting. sadly you have developed a weird repetitive song song voice presentation in both rhythm and pitch that bears no relationship with the script. This makes the voice over near on impossible to follow.
@@HenrythePaleoGuy thank you for clearing it up. I wasn't quite that far into the video when I commented, and even when you elaborated on it I was second-guessing my understanding of it. 🙂
All I know is that I am amazed that all these exoskeletal segmented creatures diversified in form so much; millipedes crabs, shrimps, lobsters, arachnids, all the myriad insects, lice, ticks, you name a niche, they are there. All variations on the "make segment with appendages, make another segment but vary it a bit" genetic pattern. It makes an obvious parallel between genetics and software, IMO.
@@TunaFreeDolphinMeat huh
Interestingly enough, insects themselves were recently found to be taxonomically nested in Crustacea. Meaning every insect, such as the fly, butterfly, cicada, roach, ant, beetle, & mantis are crustaceans. Here I thought crustaceans were already diverse enough.
@@i.m.evilhomer5084 Arachnida??? so obvious, right? scorpions and spiders are land cra..... lobs.... uh... well the whole family can still get along for thanksgiving, if they're not vegan (they're not)
@@Randomrainfrog Don't try to make sense of a channel that "doesn't have any content". Troll or Bot, take your pick. Bot is mine.
@@willisgemutlich2608 Arachnids are actually their own separate lineage being the first of the major extant groups of arthropods to split off on their own back in the Cambrian.
Technically arachnids are still listed as chelicerates but recent phylogenetic evidence makes the grounds of that classification murky as one of the major groups of animals horseshoe crabs (order Xiphosura) has recently been found to be a sister group to the hooded tickspiders(order Ricinulei) which is also supported physiologically in effect also supporting Carl Linnaeus's original assessment on relatedness. As the Rincinulei are nested deep into the arachnid family tree this implies they must be arachnids and as Eurypterids have long been known to be related to both groups likely implies they too were true arachnids in which case several definitions namely those which place sea spiders outside that grouping the clade of Chelicerates may be identical to arachnids or alternatively most arachnids ,including scorpions, spiders, camel spiders, harvestmen etc. must be reclassified not unlike the situation with crustaceans. moreover the type of UV fluorescence appears to be a basal characteristic of the clade with all known arachnids displaying some degree of UV fluorescence, interestingly at least sometimes even including their fossils which makes sense since the feature is derived from the crystalline structure of the cuticle. More interestingly phylogenetic estimates indicate the most basal members of the arachnid family tree are the numerous tiny arachnids referred to as mites. given that many are inhabitants of wet soils I wouldn't be surprised if these organisms adapted to that way of life feeding off the fungi cyanobacteria and any green algae that wound up on the shore or intertidal environments.
Of course The origin of Myriapods is also extremely mysterious with their first fossil evidence already showing that centipedes and millipedes had already diverged by then and had become well adapted to terrestrial ecosystems. In fact to date no marine fossils exist of Myriapods despite molecular clock estimates strongly suggesting the order arose in the Cambrian. Given that many myriapods are subterranean in nature and have been found living deep deep underground I wouldn't be surprised if they may have originated as subsurface early terrestrial colonizing arthropods which ventured on land hiding from the UV radiated landscape by day and feeding by night or something similar. Where there is food and water there is life and while an ultraviolet irradiated landscape is a harsh environment it would be an effective way to avoid the extreme competition within the Cambrian seas.
Palaeontologists: 'We will give this crab the prefix Calli, because it is beautiful.'
The crab: 👁️v👁️
A face of true elegance. :)
Some suggestions for future videos that I'd want to see are:
Guiyu oneiros (the earliest known bony fish)
Nochnitsa geminidens (a small gorgonopsid adapted for a nocturnal lifestyle)
Anteosaurus magnificus (the largest land predator of the Palaeozoic)
Effigia okeeffeae (a shuvosaurid known for its unique feeding habits)
Neptunidraco ammoniticus (one of the oldest and best preserved metriorhynchids)
Brachytrachelopan mesai (a sauropod unique for its very short neck)
Mauriciosaurus fernandezi (the best preserved polycotylid, with a nearly complete skeleton and some soft tissue being preserved)
Microleo attenboroughi (a tiny, basal species of marsupial lion)
Gnatusuchus pebasensis (a brachycephalic, bivalve-eating caiman with a shovel-like mandible)
Llallawavis scagliai (a small phorusrhacid, though it's the one with the best preserved skull)
I'll note all of these down. Thank you very much for the suggestions. There are so many cool topics to discuss! :)
I just love the term "Cretaceous crab revolution"
Would love to learn more about this, any good (general) sources?
Or would this be a suitable for a future video?
Band name? Anyone?
Check out PBS Eons' video "Why Do Things Keep Evolving Into Crabs"!
so, due the the vast multitude of colorations in modern crustaceans, I would love to see the rainbow of colors that they may have had. Is there a way to determine that with chemical composites of fossils? Physical chemistry? That seems insurmountable with all the variants of the lobster or crab family now, with some having stripes, dots, spikes, enlarged claws or not, etc. Same with dinosaurs. Feathers or scales? Cross? Sharks don't have scales but a layer of small teeth, with the ability to heal them all. Is there something in this? It will be cool when our fossils start giving us more and more information. I have some weird fossils I'd love to send you pics of if I can figure out how to do that, but I'm not very good at this computer stuff anymore. I'll have to go find some pics first too, but we're talking clams for the most part, from a prehistoric river delta. my neighbor at the TOP of the hill had a beautiful river dolphin displayed in his living room, FULL, and someone broke in and stole the head. Our unique characteristic is that it's SAND, like fine building sand, and we're basically on ancient sand dunes as well. The soil and topography are dunes that were once submerged. The fossil fragments I have littered about are all pure white, loose, separate chunks of these "worms", I'm fairly certain they are actually clams of a funny sort. The clumps aren't fractional, they're very much conglomerate, so we never try to cut them. You'd lose the kerf. it would be cool to see what those clams (the big ones, 3-5 inches) were eating with some modern tech. River delta means brackish which means best and worst of both worlds meeting. Edit this, please, or keep it just for yourself.
That's fascinating stuff, thanks for sharing. Sad to hear about the dolphin. I still think it's wonderful that you have so much first hand experience with all of that.
If I get some photos next time I visit my folks and can figure out how to send them to henry they will be for all to sea/brackish/fresh!
I found the part about predatory arthropod eye adaptations very fascinating. People, including myself, sometimes forget just how effective they are as predators.
Yep Odonata for example are one of the few animals that in addition to tracking prey actively compute intercept trajectories towards prey.
This is made all the more impressive since it is done in 3D motion and time with complex hovering maneuvers and turns which mathematically requires full quaternions to model successfully without the mathematics going singular suggesting they are doing something analogous to full quaternion calculations inside their little insect brains.
Thanks for this perfectly timed video! Just a few days ago I decided to keep crustaceans again: I got a tank intended to become an aquaterrarium for a group of mangrove crabs and dwarf shrimps, and a friend gifted me a terrarium which will be the home of a group of exclusivly land dwelling (and even arboreal) vampire crabs.
Can't wait to set everything up and let it run in before the new inhabitants arrive. 😁
Quit looking at me with ‘em big ol’ eyes!
6:57 Absolute god-tier photoshop work, well done lads
Callichimaera reminded me of the Silverswimmer from the speculative documentary "The Future is Wild". Silverswimmers are a group of fish-like crustaceans that were descendants of free swimming crustaceans that bred in their larvae stage in a extreme case of neoteny. Not the first time TFiW "predicted" something like this. They also predicted the flightless Jamaican caracara & four-winged Microraptor through the Carakiller & Great Blue Windrunner. The Spitfire Beetle arguably counts too, the modern Epomis ground beetles also uses mimicry to hunt their predators, although they hunt frogs instead of birds.
These fossils are amazing
Happy to see some obscure arthropod love
great content. Wish you more subscribers, keep up the great work!
Terrific video, great job describing, explaining and contextualizing the fossil, the creature and the Era that gave rise to it and its brethren.
The visuals and narration are top quality and informative.
I am very curious about the recurrence of the crab form & fascinated by all the morphological variations!
You oughta create plushies that look like these cute, big-eyed swimming crabs.
If they were still alive today I think they'd make great salt water aquarium pets, though I reckon you'd need a relatively large tank to allow them to swim around.
They're the size of a quarter, you could keep it in a gallon jug.
Carcinization: Reject humanity. Proceed to crab.
Really cool I love your evolution videos. Truly amazing content boss!
Thank you! They're really fun to work on too. :)
So cute! 11:14 ❤️ I wish I could do that. 🥰
Good video.
Thanks!
Wow. Amazing.
Awesome video
"Cretaceous Crab Revolution". That is how you name a diversification event.
Always got to make it sound grand! :)
I.e, if I was to take ME, fully fossilized, and try to cross section my fossil, with a 1 mm blade to examine everything, you would still lose a bladewidth for every cut. I hope we come up with a better way soon, as well as chem analysis and dating things... I'll keep watching, you keep sea-i'n, and I'll sea you next week!
Ten years ago i was fishing with a friend in a murky water port, he catched something strange and he start crying like a little girl... scared by the thing he fished and begging me to take off the hook... (courage is never been his best).
Annoyed i come to help him and I saw it was some kind of strange crab; it had very long legs and it was quite big, the animal was like 30 cm in diameter but, what really striked me was the shape of that legs, they were flat and similar to some kind of fins.
I know very well about crabs with paddles, i catched a lot of them in my life and that thing was different; it had 4 or more finned legs and its torax had an oval, some kind of hydrodynamic shape.
I took off the hook and freed it in the water, it started to swim forward, elegantly moving in alternately way its 4 finned legs... just like a 4 finned sea turtle.
It swimmed near the surface for 10 or more seconds then it dived, disappearing in the murky water.
I never saw something like that after, i searched on the web and asked to my professors in university (i'm graduating in biology) but i never found out what it was.
EDIT: My theory is it was some kind of pelagic, swimming spider crab (Majidae family); because the torax and the cephalic region was very similar to that of them and, on more... my fishing friend was scared not by the oddity of the animal but... just because he thought it was a spider crab (he is hella scared by spider crabs XD).
BTW I've never heard about free swimming spider crabs and i never saw a crab swimming in that way; it intrigues me thinking it can be some kind of rare and still undiscovered species, afterall seas are full of incredible and wonderful alien-looking animals and many of them still being discovered day by day.
The port in question is full of large fishing vessels, maybe one of them caught it with deep nets offshore, and then threw it back into the water, during fish processing operations in the port; just a theory.
In any case the animal appeared unharmed and healty, infact it deliberately ate the bait instead of passively being caught by the hook.
If I was a regular crab I'd be giving this freak a lot of shit.
When you look like that, you'd certainly stand out!
Not all crabs are crab-shaped, and not all crab-shapes are crabs.
Exactly. :)
good show
Glad you enjoyed it!
@@HenrythePaleoGuy yep
Interesting video! Thanks i learned many things!
I love crabs
These little guys look like a swarming enemy in Super Metroid that would dive bomb you.
They've got very alien proportions, which helps. Animal life can be really helpful in creature design.
Very interesting. Thank you. I enjoyed it.
My pleasure! :)
This video about a prehistoric crustacean was pretty dope
For a second I thought the thumbnail was made in Spore, good video though.
In my research, I’ve found that crabs, are crabby.
Is that so?
@@minted1841 Are you doubting my years of exhaustive research? lol
This cwab is tewiffying OwO
Are these true crabs or yet another lobster that went through carcinization?
Crab form is best form.
It's a freakin pokemon!
I thought the thumbnail was a creature made in spore and then I read the title
I like this video
@ 3:45 In the speculative evolutionary biology series "the Future is Wild" , 200 million years in future the fish were wiped out in the oceans and crustaceans took their place by becoming nektonic via neoteny.
id love to learn about this but i cant understand many new vocabulary i dont know. maybe subtitles if that be possible in the future? thank you
What kind of stuff was unknown? I can look into that.
Whats striking to me is how many family-level groups of brachyurans have gone extinct 11:12, in addition to some deeply branching lineages that nevertheless survived to the present..most of those extinct clades don't even have Wikipedia pages, would be interesting to see a video on them, what they looked like, when they went extinct and possibly why..
Crabweek?
...please
The reconstruction looks like the larva of a crab, that quite interesting. I've only seen a few fossils and their reconstruction that show a similar form of their descendants' offspring or larva in this case to look like their ancestor.
Edit: you mentioned it. It's as though neotony is a common theme...
"and stop staring at me with them big ol' eyes"
New to me :)
Ah, yes, the quite perplexa crab
They sure are! :)
That's surprising
Definitely!
🦀🦀🦀
Who else saw the thumbnail and thought "Anorith, is that you?"
Saw the thumbnail and thought it was the shrimp from Shark Tales
Anybody else have the like button ask "Are you sure?" before letting you like the video or am I getting a glitch?
That's really strange. Does it still happen?
Is that a real life anorith?!
Lol looks like the pikemon anorith
A little!
I'm #2!
Good stuff. :)
I present you your award, No.2:🎊😁✌🏻🏆💩🎊
@@HenrythePaleoGuy So was this video! Crabs in all their forms are fascinating creatures, and I love the different ways vision evolves in various animals. Would have loved to see this guy alive!
@@nicksweeney5176 😁 Gladly accepted
@@Bc232klm
Warmly presented, My Liege.🤴🏻
Bigger the eyes the better
Definitely!
i’m sorry but that’s just a spore creature
I thought this was a spore video
crabs are so weird. so many are from totaly different families but have adapted the body plan. kinda like peccaries.they look like pigs but are something totaly different😂
God his voice is so hot 🥵
Looks like a squat lobster
Callichimaera bauplan looks kinda like a larval crab of today…ontogeny replicates evolution once again? Edit: oh you were just about to talk about that
Please attack on titan fans don't spoil anything here
Firrrrst...!!!
EDIT: For Flipper!!😘🤗🐵
Good stuff being early as per usual, Nick. :)
@@HenrythePaleoGuy
Thanky, thanky very much.😁
Did someone say Flipper?
@@TunaFreeDolphinMeat
Tee-hee-hee...!!!🤣😂🤣 Great name, great reply! Thanks!👍🏻👍🏻
Disgusting and perverse.
Anime crab
im sorry this is an anorith
Not set in stone eh? Seems like many of the fossils *are* set in stone. You didn't say "pardon the pun" or "no pun intended". LOL Algorithmic assistance is the only reason to make this comment. ~ 2:43
Your material is good and interesting. sadly you have developed a weird repetitive song song voice presentation in both rhythm and pitch that bears no relationship with the script. This makes the voice over near on impossible to follow.
Please try to comprehend the concept of INTONATION. Used improperly it can completely ruin a presentation no matter how good.
Are these true crabs or yet another lobster that went through carcinization?
Crab form is best form.
Very unusual true crabs, from what we know.
@@HenrythePaleoGuy thank you for clearing it up. I wasn't quite that far into the video when I commented, and even when you elaborated on it I was second-guessing my understanding of it. 🙂