Jaekelopterus - The Biggest Arthropod That Ever Lived

Millions of years ago giant eurypterids (Sea Scorpions) ruled the shallow waters of prehistoric Earth, with some of these creatures managing to grow to sizes larger than a person.
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Sources:
www.ncbi.nlm.nih.gov/pmc/arti...
en.wikipedia.org/wiki/Jaekelo...
www.researchgate.net/publicat...
www.ncbi.nlm.nih.gov/pmc/arti...
www.cambridge.org/core/journa...
www.ncbi.nlm.nih.gov/pmc/arti...
onlinelibrary.wiley.com/doi/a...
www.tandfonline.com/doi/abs/1...
www.ncbi.nlm.nih.gov/pmc/arti...
onlinelibrary.wiley.com/doi/a...
academic.oup.com/zoolinnean/a...
www.ncbi.nlm.nih.gov/pmc/arti...

[@SpecialEDy]

Jaekelopterus, from state farm

[@al145]

What are you wearing, Jaekelopterus, from state farm? Uh... Armored exoskeleton?

[@aircraftcarrierwo-class]

She sounds hideous. Well she's a huge aquatic arthropod, so...

[@creppruby]

Like a good scorpion, State Farm is there.

[@namepending5620]

Thank you for this

[@rileykortemusic]

And his stand in, Drakelopterus

[@casandramedranobock8685]

It's sad how underrated the Carboniferous period animals are. There needs to be a video game, movie, or accurate documentary focus on them.

[@michaelportillo5663]

Ever heard walking with monsters?

[@malleableconcrete]

This is a Devonian animal.

[@victorcelmare]

Devonian you thicc cupcake

[@craigkdillon]

You put video game first, and documentary last. Interesting.

[@casandramedranobock8685]

You people really love correcting someone who just made a simple tiny mistake don't you?

[@SvenS2]

"HISTORICALLY ACCURATE GIANT ENEMY CRAB"

[@themirror8994]

69th like.

[@johnbennett951]

@@themirror8994 hahaha

[@yogiyudistira771]

They are looks like a giant shrimp but sadly they are more close too spider and scorpion than crab and shrimp

[@lunatrics]

imagine having a lobster restaurant 254m year ago.

[@jabaridd]

what cuisine.... maybe in the style of steak, just a block of meat without sides, or indonesian cuisine with coconut milk

[@pplla7821]

Only downside it's that there it's no cow 254m years ago.... therefore no butter! ☹️

[@jabaridd]

@@pplla7821 get out of that box, friend, experiment. we'll sear it using dicynodont fat. and we'll name this butter substitute "dick fat" (non-negotiable).

[@zenebean]

We shall feast

[@sneeringimperialist6667]

Were there trees back then? What would you roast something that big over?

[@loweexpectations3222]

Jaekelopterus - The chad of the arthropod world.

[@hailgiratinathetruegod7564]

You mean the *Mega Chad*

[@extraordinarytv5451]

Plz explain Chad meme

[@hailgiratinathetruegod7564]

@@extraordinarytv5451 Chad = sterotypical name for strong and attractive alpha males, often betrayed as somewhat stupid. The footballers in High School movies.

[@KaygeeFromNanotrasen]

@@hailgiratinathetruegod7564 *portrayed

[@extraordinarytv5451]

@@hailgiratinathetruegod7564 Oh. I thought the meaning had changed bc sometimes people say it ironically and I didn't realize it was ironic and I thought Chad had a new meaning.

[@dener-7412]

4:18, 7:58 OMG Dud, thanks a lot for featuring my artwork on you video, it's a pleasure ^^

[@akufromthefuture7159]

Did you get credited?

[@steppo8634]

Aku From the future yep look top left

[@dener-7412]

@@akufromthefuture7159 yep

[@wildmnwilton3366]

That claw specimen looks like a 9 year old trying draw something scary

[@MouseGoat]

So are 9 year olds great at drawing?

[@cheeseguru1017]

It worked though

[@elmothewise3915]

@@MouseGoat some are.

[@Bristol_Lively]

@@elmothewise3915 Such wise words, Elmo The Wise.

[@elmothewise3915]

@@Bristol_Lively thanks.

[@lilitheden748]

I remember making a sea scorpion out of cardboard with y daughter, many, many years ago... They had to make an animal that dated from before the mammals. All the other kids made dinosaurs, off course. She went to school with this one meter long sea scorpion 😃. That’s what you get when your mum is a bit too interested in palaeontology. It was fun making it and she got good grades.

[@katiekane5247]

Great mom, she'll never forget!

[@TragoudistrosMPH]

Leave it to Lilith to trail blaze :)

[@fuckinantipope5511]

Why do other schools always do such cool things? My schooltime was boring as fuck, with no interesting projects or anything like that.

[@maryw.5779]

That sounds like fun! You're a great mom. I had a great mom too. When one of my sisters' classes was the only one to not go on a field trip, she took on the principal so all classes at that grade could go.

[@jamesdriscoll9405]

Eryops served me well in a similar situation.

[@zenebean]

Future paleontologists find a male fiddlers crab claw: this must have belonged to a large fearsome arthropod Actual fiddler crab: hello ladies, like whatcha see? *tips over*

[@Nazrigar]

When your claw is so big it slows you down from trying to escape predators xD

[@hyperion3145]

@@Nazrigar A small price to pay for getting laid

[@mr.g1656]

@@hyperion3145 thats crab is simp

[@mrmonsterhunter808]

Thank you, your comment is hilarious

[@currentbatches6205]

Yeah, 2:47 - a lot of assumptions involved here.

[@AntoniusTyas]

God, those private collectors keeping their fossil away from scientific research really irritates me. Much in the same way car collectors hiding away their Porsche 911 GT3s, not being driven 'to increase the value of the car'.

[@HebaruSan]

To what extent is it like archaeology, where having the artifact without its original context severely limits its knowledge value?

[@SuperLoops]

HebaruSan depends what information you need to know but often massively, fossils are often dated relatively so you need to know about the strata of rock above and below it, you need to know the environment it lived in, context is super important. Mac mcskullface I know what you mean but theres also stuff that Im glad is in western museums that could easily have been in Iraq or Syria and got looted or destroyed in the past couple of decades, like a lot of other stuff did. to be honest preservation and study is way more important than who "owns" it imo. the ppl who actually owned it died thousandsve ago. today I think it belongs to all of us and modern political and geographical boundarys dont mean much to me in that context

[@randomuser5443]

Honestly, what do they have to gain

[@orlab-t9217]

I've always wanted to own fossils but if I did i would have to share them with museums, researchers etc as much as I could. I just wouldn't be able to let them gather dust on a shelf when they are all important

[@lilitheden748]

Indeed, but the cars are not of value to science... however fossils that are unique are. I do not find it wrong that private collectors purchase rare fossils. Most musea or scientific institutions aren’t that wealthy so it is not easy for them to acquire said fossils. The collector could purchase the thing and have it studied ... there’s nothing wrong with that. Scientists will take extra good care of the thing and we will learn a lot more about the world that once was. It’s the same with paintings. They buy this multimillion Van Gogh and put it away in some safe...Paintings are made by their creators to be seen... not to end up in an acclimated dark cellar. So many things are lost for the greater public because of the selfishness of a few ultra rich people. Such a shame.

[@piyamaslimaichay9061]

Yes, a​ sea​ scorpion​ episode! Eurypterids are​ one​ of​ my​ favorite​ group​ of​ prehistoric​ arthropod!

[@utubeisCensorred]

Its hard to comprehend how terrifying this would be to see. Mentally it would be staggering to process.

[@worlore1651]

It would be like seeing an alien space ship above us

[@loercayt6146]

Would u eat it tho

[@randomrazr]

how would it have tasted? like lobster?

[@SAP20092]

@@randomrazr probably yeah

[@kingswarthy]

King crabs look real freaky, it’d probably be close to that but lobster like

[@admiralsquatbar127]

Jaekelopterus lived during the Age of Nope.

[@sockmonkeyenthusiast5184]

SERIOUSLY THOUGH EVERYTHING WAS A GIANT F*CKING BUG

[@sorcererberoll4641]

I’m glad I live in a time where basically humanity is having to deal only with disease and famine because I don’t want to deal with the hundreads of millions of years of pure nope

[@MolecularMachine]

Lmao imagine a global crisis but it's predators. "This year has produced an unprecedented number of Utahraptors. Stay inside, and if you must go out, travel in groups and bring heavy weaponry."

[@saylremi]

@@MolecularMachine Lol that's the premise of the next Jurassic world movie 😂 That would be terrifying

[@poiuytrewq11422]

We probably wouldn't of made it this far if most of these creatures existed.

[@lhtyeehaw1319]

@@poiuytrewq11422 we are apes that learned how to make sharp rocks and how to harness plasma, I think we'd be fine

[@thomastakesatollforthedark2231]

@@lhtyeehaw1319 we'd have to adapt to different fauna and look different that's for sure

[@MrFossil367ab45gfyth]

Can you do a video on the family Madtsoiidae? This is a extinct group of snakes that ranged from the Cretaceous and well into the Cenezoic Era. They were related to the boa constrictors and grew to large sizes. This group contained Gigantophis, Wonambi, Sanajeh and Madtsoia amongst other large snakes. Madtsoia is mostly known from fragmentary remains, but there are estimates of size that range from 5-8 meters. This snake could've been the largest Mesozoic snake. It lived during the Cretaceous, Paleocene and Eocene. But it's family "the Madtsoiidae" prospered way past the Eocene.

[@Frogboyaidan]

Can you do Therizinosauria Also

[@MrFossil367ab45gfyth]

@@Frogboyaidan , maybe he'll make a video about that.

[@RMSLusitania]

They better do Coronosaurids ceratopsians because i love mocking then as Corona beer dinosaur

[@xenomanxxxx6069]

Also other prehistoric giant snakelike squamates please!! Ie, titanoboa

[@steppo8634]

Molly_music band he has done it 🙂

[@theluftwaffle1]

I remember first seeing this guy in walking with monsters as a kid.. man I’d hate to be a fish in those days.

[@LordVaderTyrannus]

That was an oversized Pterygotus

[@deerdeerdeerdeer9698]

How about a fisherman thought

[@TheDominionOfElites]

I’d hate to be a fish now, have you seen ocean predators?

[@revimfadli4666]

@@TheDominionOfElites or those giant illegal nets?

[@daliborjovanovic510]

@@LordVaderTyrannus Nope, it is Jaekelopterus. The Pterygotus in WWM is given a length of 3 meters and cited as the largest arthropod ever to have lived, making it obvious that it is Jaekelopterus and they simply went with the notion that it was a species of Pterygotus.

[@Yupppi]

"Is in private collection and can't be studied" now that's a prime example of why things like this shouldn't be allowed to be privately owned unless shared for research.

[@Beaster565]

In the words of Indiana Jones, “it belongs in a museum”

[@rybuds47]

It seems strange the someone would be interested in collecting something like this and not want to study it.

[@superbn0va]

Who has it? Why? How come?

[@zakthompson6312]

What if you lived in a small poor country, and lived on land owned by your family for many generations. Now imagine you find this fossil on your property, but then scientists from another, more wealthy country show up, and take it from you. Should that be allowed?

[@musicano3647]

​@@zakthompson6312 Do you own a fossil? Do you know many poor people that own a fossil? Many people that have these private collections are very likely to be rich, and all they're doing is slowing down science. You gain nothing for keeping it if you don't intend to study it. Why would you defend selfishness?

[@TaterChip91]

"5 years ago..oops, sorry. Millions of years ago..." --Zefrank

[@tyronejones4245]

He lapsed into young earth creationism for a second there

[@Blabimir]

Eurypterids kinda vibin doe.

[@memomorph5375]

Yeah! Gotta wonder what exactly drove them extinct. Seems like large sea-dwelling arachnids would arise again since then, too

[@Kasmodamous]

memomorph Two words: Jawed Fish.

[@jordensjunger]

Gosh I would absolutely love a video on horseshoe crabs. Fascinating little critters.

[@tinamclaughlin1991]

Stay safe and keep this amazing info coming!

[@notovny]

🎵Eurypterid time! Come on, grab your friends With giant claws in brackish wetlands With Jaekelopterus And lobe-finned fishes The Devonian will never end It's Eurypterid time!🎵

[@mattwilson8298]

Watching the closed captions struggle with wild scientific names really made my day. Terry Goated and Jacob Taurus will live in my heart forever 💗

[@quickestscoped7603]

Cutie Ramus

[@Deform-2024]

This thing was also estimated to have weighed 180kg aswell, that's larger than a Jaguar!

[@randomuser5443]

And larger than a human

[@Shimada.]

Why you repeat yourself

[@Deform-2024]

@@Shimada. KZbin glitch.

[@Shimada.]

@@Deform-2024 oh kk

[@DexterHaven]

Wow, the world was so different back when Joan Rivers was young.

[@lukestrawwalker]

savage! OL J R :)

[@ThorgrimTheWise]

You'd need a lot of butter for one of these guys

[@spyrofrost9158]

And a very big pot.

[@frodobaggins6684]

And even bigger tongs

[@thomastakesatollforthedark2231]

And a giant stove

[@Badbirdie]

That's it, I'm gonna make a horror movie about the Carboniferous period. These things are way too badass to not be in a summer blockbuster.

[@paintedpebble4687]

Me: *travels back I’m time and ends up in the ocean Me 2 seconds later: “I really hope that thing didn’t see me”

[@phiterhcs5260]

Arthropods back then: kill vertebrates Meanwhile vertebrates now: kill arthropods The world turns

[@Claudia-tm9dr]

Always puts a smile on my face when I see a new video from this channel :)

[@2020Twenty]

Imagine the "lobster" dishes people could make with these arthropods if they were still alive today.

[@DickDiamond74]

imagine the size of the pot and stove they would need lol

[@ericvandenavond8748]

They would probably be overfished to extinction knowing the lengths that humans will take for some "exotic meal"

[@Chiknnnnnn]

That's the point in reality, if dinosaurs, marine reptiles, or prehistoric sea creatures actually existed today, humans would just hunt them to extinction anyways.

[@nyashanatasha17]

Dude, they would make dishes of human if they were still alive today

[@UniDocs_Mahapushpa_Cyavana]

@@ericvandenavond8748 Or a regular one.

[@marcodaddario3965]

My psychologist: Jaekelopterus no longer exists, it can't hurt you Jaekelopterus: 0___________0

[@pousketie5720]

1:53 that’s the face of someone who just got stabbed by the boss

[@hyperion3145]

Skipping the tutorial to go straight into the boss

[@Kasmodamous]

Saturninus Oof

[@diamondjub2318]

imagine swimming in the ancient sea and a giant sea snipper swims up to you

[@robothunter1035]

Forget it, Jaekelopterus. It's Devonian town.

[@ericsc28]

Remember those huge insects on King Kong? It's terrifying that they were actually that size at one point.

[@YusufGinnah]

I love Eurypterids.....!! Thank you for this production...👍🏼 👍🏼

[@british-sama7007]

I've been waiting for this , thank you

[@jtktomb8598]

Love me some eurypterids !

[@adampatterson1624]

Happy sunday lads

[@c-wsoldvideoarchiveofthegr6219]

You should try the history of cats next, loads of people would like that

[@Autissm420]

ive been binge watching a lot of your videos this weekend, good stuff

[@al145]

Jacob Lobsterus, good guy Jacob, we used to hang out back in the day but i lost touch. His uncle Terry Gotus used to buy us beer and cigarettes

[@laurachapple6795]

Thank you for continuing to update during this time. I need the distractions.

[@thenoblegoat7895]

Hey keep makeing videos about ancient inveritabrates please. There's so few resources on them and there fascinating

[@daliborjovanovic510]

For anyone wondering, yes, Jaekelopterus is the giant eurypterid from Walking with Monsters, even if it's called Pterygotus. The Pterygotus in WWM is given a length of 3 meters and cited as the largest arthropod ever to have lived, making it abundantly clear that it is Jaekelopterus rhenaniae and they simply went with the notion that it should be called Pterygotus rhenaniae. Prehistoric taxonomy is often very wishy-washy and by what generic name a fossil species goes by changes frequently.

[@IAmBuddythedecibwave]

This thing looks like it derives rapturous levels of glee from pinching literally everything it sees.

[@guardian08527]

"private collection" Owner: Meeeyah! I keep this now!!! Nobody can see it because I smell my own farts!!! Meeeyah!!!

[@wasd____]

It's sad that rich people basically get to say, "Welp, fuck everyone else, I'm locking up valuable information that could benefit everyone because reasons."

[@thomastakesatollforthedark2231]

@@wasd____ not because reasons. Because they earned a lot of money and have the right to spend it how they like it

[@wasd____]

@@thomastakesatollforthedark2231 Uh, no, you do NOT, in fact, have the right to spend your money however you like. There's a lot of things you can't spend your money on (illegal drugs or weapons, for example) and a lot of ways you're not allowed to manipulate your money (money laundering, loan sharking, etc.). I don't see why having money is a justification for letting someone deprive all of mankind of valuable discoveries about their common heritage.

[@YEs69th420]

@@thomastakesatollforthedark2231 eat the rich

[@chrisrenfro2058]

@@wasd____ i dont like the rich anymore than anyone else, but i also value autonomy highly.. i dont even thing drugs or weapons should be illegal

[@APS96a]

I love Zdenek Burian pictures! Thx for next great and interesting video. Stay safe.

[@badabingbadaboom9251]

I just found this channel and I'm in awe

[@liliaaaaaaaa]

I am now imagining a sci-fi horror movie game show scenario involving some people going out on some camping trip to some remote hidden wilderness backwater, then accidentally going through some kind of warp-hole by accident, and going back in time ... then having to deal with the revenge of the giant shrimp, lobster and finally, as the boss level, the giant eurypterid........

[@thedoruk6324]

The *Ultimate* Prehistoric Candidate for the Pre-history Muk🅱ang(!) D:

[@gaeshows1938]

prawnography!

[@bbdrix23]

This channel is awesome. I subscribed.😎

[@katawatenshu]

1:06 *sees the expertly drawn silhouette of a human, suddenly dubious about all of this*

[@Xaiff]

Jaekelopterus. Somehow the one stuck in my head is Jackalopterus. Either a winged jackal or a winged jackalope.

[@bobkingofseagulls9884]

Honestly, while there are so many groups of animals I wish we still had around, I most of all miss those huge arthropods we had in the oceans. There are some big marine inverts, sure, but they don't reach those proportions and when they are similar in size its because 90% of that length if paper thin legs.

[@Philly_Gamer]

Thanks for the new info, here's a like and sub

[@Mydarkarts23]

Jakalopterus is fascinating to learn about. Great video.

[@pizzafrenzyman]

Imagine an egg cluster all hatching at the same time, and having 200 of those 10 cm long infants all trying to feed at the same time. Could they grow new limbs? Would they make bubbles if they farted? Could they breath on land? did they taste like chicken?

[@presidenttogekiss635]

I can't believe there isn't a pokemon based on this creature yet. It's PRIME pokemon material.

[@JOQUEENEZ]

Golisopod!

[@Rakkhot]

"it's a captivating organism" Claw: "Snap! You got captured!"

[@jonnyqwst]

Great show once again

[@Frogboyaidan]

Can you do a video on Therizinosauria There pretty interesting dinosaurs that are underated.

[@lmao9692]

Molly_music band Because of Ark I love these things.

[@Frogboyaidan]

@@lmao9692 yea ark and isle but there are tons more that no one talks about

[@veggieboyultimate]

When do u think u r gonna do the next review for the next episode of walking with dinosaurs?

[@moremoneyfordreadnoughts1100]

You have some really great artwork in your vids.

[@xavier84623]

Ptery-GOATED

[@Pipkiablo]

If I had a private collection of rare fossils, I'd totally invite a bunch of scientists to come to my house and study them. And I'd probably make them snacks. I'd love to know more about the lives of the creatures I own! How can someone not?

[@forg_is_real]

My little sister found a fossil before! it was pretty cool!

[@purplehaze2358]

Yay, more fuel for my crippling fear of the ocean and slight fear of bugs.

[@LDrosophila]

These are wonderful to watch during quarantine

[@pallomagc]

Nice video!!

[@myramadd6651]

Could the size difference between the two Jaekelopterus species, be actually the same species, but male and female like their relatives the arachnids?

[@thomastakesatollforthedark2231]

Given the few things they are most similar in, that'd be quite a bit of sexual dimorphism

[@IIAOPSW]

I was thinking same thing but child and adult.

[@LordZanba]

Interesting thought, but the video (if I understood it correctly) indicated that the two species were found in different locations: The larger in Germany and the smaller in the US.

[@gustavosauro1882]

@@LordZanba Pangaea

[@juanjoyaborja.3054]

@@LordZanba Well, if the OP was a hypothesis, you've refuted it.

[@chrism8860]

Would love to see how the arachnids are related to these creatures. I know that sea spiders are somewhat related, but these are probably closer

[@efjay3183]

Outstanding work, evolution. That’s a fine lobster!

[@ericsbuds]

great video! very interesting!

[@brobamathegreat7527]

Jaekelopterus would make one big delicious meal. Imagine a grilled lobster the size of human. I think its meat would taste like lobster.

[@dinohermann1887]

You're damn right! Lobsters and Crabs are like modern day Eurypterids, if you ask me!

[@jcp1296]

Pretty sure it woudn't

[@dinohermann1887]

@@jcp1296 Actually yes! Just like Anomalocaris, that would taste most likely like Shrimps/Prawns!

[@jcp1296]

@@dinohermann1887 how do you know that

[@jcp1296]

@The Bald Eagle well yeah, they could have tasted like pickles, for all we know

[@istvansipos9940]

with the never fading love and respect for animals in my tiny little soul, I just can't understand myself right now: If I saw one of these buggers on a beach, I would grab the heaviest stick of the entire neighbourhood, and I would bash this thing until it or my stick gets deleted from space time. damnnnn... next time, we need a video about a cute squirrel or something. but no. rest assured, I am not the 1 disliker.

[@astick5249]

If i saw one of those guys on a beach id try my darn hardest to haul that thing back in the water.

[@LordZanba]

Why not just simply walk away from it?

[@seleuf]

The Jaekelopterus' prey take umbrage with your assertion that the Jaekelopterus is a wonderful animal. =P

[@nonexistantman5797]

In the old days,everything was fucking huge. -some dude

[@hoibsh21]

Jaekelopterus: Don't mean to brag, but I'm the biggest arthropod that ever lived. Me: Mm-hmm. And I'm gonna grill up the biggest dinner I ever ate!

[@steverino6954]

Just makes you wonder about the amazing creatures that could be on Europa, Enceledus, Titan, or one of the extrasolar planets discovered in the goldilocks zones of their host stars.

[@laffing_hwhitee]

Amazing creature & info

[@cornjobb]

Jaek had a small car body repair shop in southern NJ. he was moderately successful and married his college sweetheart, Millie Pede in 1967. they had no children

[@craggall]

Can't help but thinking some of the "smaller" species are just younger specimens of the same species, as this misunderstanding happened with many dinosaurs,

[@osmosisjones4912]

do a video on lochness Giant Eel. Frome the eel like depictions to flipper in retrospect looking closer an eel tale to finally the eDNA

[@danfobb8301]

thanks for his video

best channel ever

[@DianitaYoutube]

Mukbangers in the corner: 👁️👅👁️

[@DogWalkerBill]

Jaekelopterus: How would you know if you found a baby or juvenile Jaekelopterus rather than a different species?

[@realdragon]

Would it be possible to make walking beds out of them?

[@Tymdek]

Great video. I've always liked eurypterids. Next maybe a video about Palaedictyoptera?

[@nemilyk]

An ancient, oversized apex predator? No one tell Jack Horner about this! He'll start campaigning that it was a pure scavenger, too!

[@TimothyGrabarczyk]

Could you make a video on the major evolutionary time periods, and what makes them distinct? Such as the Silurian and Devonian epochs, for example. It's hard to find something satisfyingly detailed enough.

[@heartsong3149]

Wow! Talk about river monsters! "Fish on!"

[@mr.nobody5028]

I love Jaekelopterus with drawn butter.

[@jamesagwe2981]

I want a giant dragon fly

[@kieranfar9923]

If this thing was alive today I know some dude would be keeping it as a pet in his basement

[@junevue9665]

Best era and most interesting

[@earthterra8546]

Amazing video but I can't wait for another episode of Wallace II

[@dynosoul839]

Weird seeing this years after Trey's video. When it came to relationships I mean between horseshoe crabs and arachnids. So basically in this video you're saying eureptyrids are related to arachnids more than horseshoe crabs and not the other way around-?

[@Dragrath1]

Not sure about Trey's video but given that genomic studies analyzing the whole genomes of over 50 arthropods from all groupings have have actually found quite convincingly that horseshoe crabs genetically ARE arachnids photogenically nested deep within the Arachnid family tree with hooded tickspiders as their closest living relative. So unless you want to split arachnids into several clades in which case amusingly Hooded Tickspiders, Harvestmen, Camel Spiders, Psudeoscorpions, Mites and Ticks would all cease to be arachnids. It also explains all the weird quirks of Horseshoe crabs like why they need to return to land to spawn a trait which today only seems to be shared with sea kraits and sea turtles. More likely what this means is that Eureptyrids would also had to have emerged among the true arachnids which would make sense given that like Horeshoe crabs their oldest lineages have a connection with shallow freshwater brackish environments . Both are probably examples of secondary re-adaptation to aquatic environments not unlike mosasaurs and whales. There is direct fossil evidence that red algae had colonized freshwater environments as early as 1.6 Ga and Fungi have similarly also have had an ancient presence on land for billions of years. Which makes sense as they are subterranean organisms incidentally not unlike most arachnids so given that freshwater and soil environments were already well established by the Cambrian it seems quite plausible that arachnids were also already terrestrial. After all it would explain the otherwise weird and seemingly useless UV florescence if they have evolved it as protection from the onslaught of preozone level UV radiation. This makes me wonder if Early freshwater environments played a much larger role in the evolution than what we know primarily due to fossilization biases.

[@lordblackwell9102]

Trey's a hack lol.

[@blan_k4691]

@@Dragrath1 Exellent analysis. This is what I come to the comments for.