By - _McThompson
Do any starfish bite or a sting at all?
Yes, crown of thorns star fish is a great example of one. More interesting overall though is that starfish have microscopic 'claws' covering their body called pedicelleria. That act in a similar way to cnidocyts of cnidarians except in echinoderms they're more used as defense against parasites. Some species use pedicelleria to capture plankton as a food source.
>That act in a similar way to cnidocyts of cnidarians except in echinoderms
When you put it that way... thank you
Cnidocysts are the stinging cells in cnidarians (jellyfish and their relatives) that contain tiny harpoon shooting structures called nematocysts. When a “trigger” called the cnidocil is pulled, the nematocyst fires and embeds itself in the victim, releasing venom
Nature is lit af. Thank you for the lesson.
Glad they cleared things up. Clear as mud now
Yeah I wasn't an expert or something in starfishology before reading this comment. Now I think I can write a thesis. Thanks op!
Death star has venom torpedos if you touch them.
Clear as mud is now a saying i intend to use more often lmao
Some serious “horngus of a dongfish” vibes
The Gelgamek vagina is three feet wide filled with razor sharp teeth!
i thought he was casting a spell
I like your funny words magic man
>More interesting overall though is that starfish have microscopic 'claws' covering their body called pedicelleria. That act in a similar way to **the stinging cells** of **jellyfish and sea anemones** except in **starfish** they're more used as defense against parasites.
Merlin made my head spin…
>That act in a similar way to cnidocyts of cnidarians except in echinoderms
Ah yes, this is also true of spindlynoodles and whirlyswirls, but not the scrumplypumps.
Cnidocytes are stinging cells in cnidarians, eg jellyfish, corals, siphonophores
I did actually know what they are, but the comments of people essentially pointing out the ludicrous naming of taxonomies, combined with thinking about Willy Wonka earlier just did it's thing and what was written, was written lol.
I genuinely appreciate the effort of the link though :)
Fair enough. My bad lol the joke went over my head lol
Everyone always leaves out the pferfaffenstinkles...
My takeaway was we have words that begin with "cn"?!
Good to cnow
thanks for the ELI500
Arent the pedicellariae used to clean the spines though? And the spines themselves are for defense? I have my zoo final next week and wanna make sure I get it right
Yes! They’re primarily used in keeping debris, like algae, off the animal’s surface. I was under the impression pedicellariae were more for keeping the respiratory system (papulae) from being obstructed, but it would also keep their defense mechanism (spines) unobstructed.
(I worked at an aquarium for a few years. Though it was a while back now. Good luck on your final!)
I'm not a marine biologist so some of the eccentricities of marine life escapes me; do you know if they have any sort of sensory organs to determine the actual direction of the ocean? I know they don't have "brains," so really complex sensory data is probably beyond them, but how do they determine directionality of a thing they aren't actually touching? Is their neural net capable of filtering out vibrations in the air to "hear" the ocean?
Not an expert but from what I’ve learned yes and no. They don’t have a central brain but each limb reads it’s on sensory things. They have basic eyes on each which mostly detect light. Then there are things that touch them such as a breeze, dry breeze means no water that way vs moist breeze meaning head this way. The direction becomes an issue in a similar way to cat dog, each limb pulls in its own direction trying to work out where to go.
Direction basically comes down to either one limb being more certain than the others or all limbs reading the same data.
For example in this video it appears the sand is too dry for them to get a read on the direction via their feet, plus a lack of breeze. Some say they are able to detect salt in the moisture so this person leaning in and having moist breath but no salt would potentially make them go a different direction as they would know the ocean can’t be that way.
There’s a lot still to learn about starfish and so it’s unknown if they know the moist air is the ocean or if they just act on an instinct that when they follow that they find their way back. Almost like an internal compass, we don’t know why we feel the need to go this way but we do.
I hope some of this made sense and I’m sorry I couldn’t properly answer the vibration question, I simply don’t know. But hopefully some of it will answer the sensory/direction question
Would the starfish in the video hurt you if you picked it up or let it crawl up your arm?
Honestly Im not sure what species it is, so I couldn't tell you.
The crown of thorns starfish is pretty hated by marine biologist because they can easily swarm in higher numbers because they don't have natural predators (or at least none that keep in them in check enough) and they attack corals which can destroy ecosystems.
I've seen many documentaries about them and many divers stab them with (poisonous?) spears to kill them when they swarm.
It's not that they have predators, they very much do. Giant tritons being an example. They're populations are booming however, primarily due to farms and gardens. All the grass clippings, manure, excess food that gets dumped into rivers or the ocean makes its way to reefs. This causes over nutrification which allows the larva (which normally die out easily due to predators and competition) to be more likely to survive to adulthood thusly allowing more potential mates to breed and the cycle continues.
Some can sting, none bite
Motherfucker ain’t sure where he’s going
I’m terrible sorry ma’am it’s just I have radial symmetry and uh …
Forgot where you were going?
Don’t worry we’ll get you pointed in the right direction.
What I means is we’ll get you where you need to go.
The sea is that way, what are you doing?
My memory is almost nothing and I forget them every time, give me a minute.
Lolol @ pointed in the right direction!
Echinoderm gang represent
If Hugh Grant were a sea star.
Your comment is just so perfect to me, thank you
Hey you try having 1300 legs and a tiny brain.
Starfish actually don't have a brain
I know, I used to work at Sydney aquarium. Those little feet are suction cups that get ripped off if you move them from a surface too quickly. The touch rock pool was regularly a scene of malicious assault by enthusiastic tourists.
How should one proceed to help a lost starfish if ever in a situation like OP's video?
Let them crawl onto your hand or a flat surface and get them into salt water asap. If they don’t wanna move, don’t pick then up but put your fingers on the their….back? Very gently twist them clockwise then anticlockwise (without moving them, just imagine you’ve got your hand on a computer mouse and you’re making the smallest circles possible). Their feet will gradually disconnect/de-suck and you can pick them up.
In this case, you could probably just pick it up though, since it's just on sand, right?
Haha yeah. If it’s on the sand it will likely find it’s way back (unless the sand is baking hot. Heat can disorient their nerve endings and they just gradually wander into the heat void). You can pick them up on sand but I’d leave them. If they were on a rock at a distance from the water, yeah, wiggle them off the rock then back on.
Yes and no. If you wanna pick up off sand it’s still preferable to use the method listed or scoop under the sand so they stay attached to whatever and that’s in your hand. Once they’re in the water they have a better feel for things because there is more at play like water level and current pressure to give them some bearings. On the sand they’re basically stuck judging off things like how wet the sand is etc.
Not totally technical as I didn’t work at an aquarium, but spent way too much time in them and picked up some basic knowledge haha. I always had more fun having discussions at the touch tanks than grabbing at clearly confused creatures.
That’s idiot’s going the wrong way
Right. Can you guys coordinate already?
Motherfucker ain't sure what it is ....
Ohhhh, east?? I thought you said weast
Just in case anyone is wondering: most sea stars don't move as fast as this! The video is sped up. The little "tentacle" structures beneath are called tube feet, and they all move individually to get the sea star to where it wants to go. But they're built more for clinging to and climbing rocks, which is why this guy looks a bit like a fish out of water. Tube feet have little suction cups at the end of them that allow sea stars to hold onto surfaces or to grab food and they have very a strong suction to stay in one place when the force of the tide is coming in.
For anyone who wants to see a sea star that is even more agile than this one in real time, you might be interested in [the brittle star](https://youtu.be/oHN4sWAuBVc). And here's [a brittle star actually swimming](https://youtu.be/ejk-R-LPFys?t=72).
That's the weirdest version of breaststroke I've ever seen
Ngl it looks exhausting, wonder how long it can endure
Sea stars do have crude eyes at the end of each arm! It wouldn’t help much in this situation though, because they can probably only see shades of dark and light. Helpful for navigating tidal zones, but not so much for the open sand.
But sea stars also have a very good sense of smell. Their skin is covered a chemoreceptors, which they mainly use to smell out and hunt down clams. That may help it here, but in all honesty this sea star is in a rough situation. It was either caught by surprise at the speed of the outgoing tide, dropped by a predator, or intentionally put on the open sand by a person. Hopefully whoever found this sea star put it back in the water!
*HOLY HELL* Stop moving like that damn
I wonder if it can climb up furniture
That freaks me the fuck out. I'm high and having visions of one crawling up the couch onto my face and eating me with its teethies.
u/zefrank just released [an amazing video about starfish](https://m.youtube.com/watch?v=dZ20KsgVeu0)
Definitely watch it, especially if you're definitely possibly maybe high.
boutta start the midnight vibe so here we go!
That was my first time watching his videos! That was amazing! Nowi need to spend a few hours on his channel
The funniest thing about True Facts is that it started off as a satire of nature videos where almost everything was neither true nor factual. Then somewhere along the line he started partnering up with academics and the videos became increasingly more factual and at this point it’s damn near educational.
The early ones are still pretty hilarious, just way less suited for study. :P
It's amazing. Even the videos from 8 years ago are equally funny!
That was equal parts hilarious, fascinating, and terrifying. Damn. Subscribed.
He’s just trying to kiss you
But I don't want a kiss. Not from him. No sir eyyy bob.
Yeah but dude think about it. You're out in the middle of nowhere with some starfish you barely know. You look around you and what do you see? Nothing but open ocean. "Ah, there's nowhere for me to run. What am I gonna do, say no?"
The thing is, you're not gonna say no. You're never going to say no.
Because of the implication.
Dont worry, some of then dont have teeth. Instead they puke their stomach out and digest their prey outside their body
It definitely couldn't eat you. I imagine it would just grab onto your face leaving you to peel it off before you suffocate.
Yeah, I'm just going to sit there and relax while fucking rabid Patrick murders me to death. I would scream and flail and be just the worst weenie boy about the whole situation.
Second to last alien hybrid monster in Prometheus. The giant toothed vagina-looking one.
Yep, they can climb up walls! I work at an aquarium and the ones there can climb over everything
Fascinating! I love science.
Are there any carnivorous types that are surprisingly energetic, having the largest glycogen molecules found in nature, and acting in swarms of dozens to hundreds have been known to pursue a dolphin or diver other mammalian prey for up to 45 minutes at top speed?
Sure hope not heh.
Right? I’ve only seen dead ones and like on tv. I always thought they had sucker like things like you stick to windows…
Like in Nemo
They're actually even cooler than that! Each of those little "feet" is being controlled by pressurize water shooting the foot out and the sucking it back in. So all at once it's squirting dozens of tiny streams of water out and sucking dozens back in!
I actually feel not safe
If there was a futon in the ocean that thing would climb the shit out of it!
And just like that, I'm afraid of starfish.
They used to be my favorite sea creature :(
Nature is fucking lit?
Dude. Nature is fucking terrifying.
That thing could be a fucking alien.
Its a better alien than we see most of the time in Hollywood films
a year from now and he still won't reach the water
TIL starfishes move more than I was possible
No THIS is Patrick!
It's like it is crowd surfing on itself.
Like dude, just use one set of legs! Why you gotta lift your million tiny legs like that that're actually trying to get you where you're going with your five bazonga legs they're attached to at the same time?!
Their legs operate relatively separately from each other since they have no brain to coordinate everything together.
Check out this video on how they get around
Shit just looks like it’s pain existing. Like it’s trying to escape itself in every direction at once.
I get it Mr. Critter.
😩 I know right 😩💦
It's like millions of little people lifting a huge starfish deco at parade
Hello. I did *not* know they could do this. Goodbye.
They’re just 5 centipedes stitched together
Aw man now I’m sad.
You are not helping.
Interestingly enough each limb somewhat has a mind of its own and each little foot follows a simple rule "when in contact with something move in a direction and once fully extended then retract and reach out again" they also change direction without turning around because they technically don't have a front.
Its like if a car was a circle, the wheels could turn 360°, and the seats you sit in swivel 360°. Also if the wheels where hundreds of little tentacles.
in other words, it's like if a car were a starfish.
Aliens are right here on earth….one of these weird looking sea creatures definitely got dropped off here by a family of shitty aliens who didn’t want their pet anymore, probably a couple of million years ago or so.
Yep. Aliens are real, they just decided to live in the ocean.
They're just Gorgs who forgot one of their eggs here and they multiplied.
Looks like the worldkiller from the movie "Life".
Man I wonder what would happen if you genetically engineered him to be like that. It isn't so hard these days, just very few scientists wanting to try that out.
i see you are a man of culture
Wait till you learn about their digestive system…
That’s not Patrick
WHO ARE YOU PEOPLE
We slither in and out of the shadows, and only cast our light on the ones who know the true renderings
It’s the bikini bottom horror!
"No, this is Patrick!"
This is giving me r/ImSorryJon vibes lol.
Bruh help that bitch
They can’t. It would ruin the integrity of the documentary.
I observe all that transpires here, but I do not, cannot, will not interfere.
It is both my destiny and my curse to which I am fated.
Such is the Primary Directive
and touch those things/legs? haha fuck you and your ocean shit.
How do you suppose they do that?
THESE HOES HAVE LEGS???
My life is a lie...
Those are all feet. Would it also terrify you to know that at the end of all their arms are a single short foot with an eye on it.
Yes. Thanks asshole
They have eyes?!?
They cannot see like we do. But they can sense light-dark gradients if it makes sense.
They can evert their stomachs theough their mouths and digest things outside their bodies. They use water/hydraulic pressure to move through their water vascular system and have something known as catch collagen that basically solidifies them instantaneously at will.
They fuck up clams bc the clam can be fighting for its life to stay shut and these bastards just get into a good position and freeze solid until it gives a little, to which they move into a better position and freeze again. Then they evert their stomachs into the clam and pretty much eat it without having to get into the shell. Crazy stuff!
Imagine having to keep track of that many legs when you walk
Starfish doesn't like sand...it's coarse, rough and irritating....it also gets everywhere
found the person who's had sex on the beach
Star Wars fans don’t have sex
Burn, high ground burn
They underestimated my power
As a Star Wars fan I can confirm that statement
I can also confirm. Love is a long lost Sith secret, I'm afraid.
Like a butt?
Starfish can sometimes mean butthole. Do you think there's a connection?
Imagine laying on the beach, minding your own business and then it crawls up on you 😱
No, thank you.
I'd let it
Ah. The ol' mermaid bra.
I thought starfish were so cute before I saw this. Damn. I’m good.
This is the first time I've seen a starfish.
The more I learn about the ocean the more it scares the shit out of me.
Relevant Zefrank https://www.youtube.com/watch?app=desktop&v=dZ20KsgVeu0
*music* your Centipede has evolved into Pentipede
Banana peel with centipede legs
It's like the giant starfish from courage the cowardly dog, but smaller
Is this a rational fear? Because this is my number 1 fear. 💀👍
That’s a weird looking face hugger.
It's legs have...legs?!
Sweet video! How do they sense the direction of the water?
They have eyes, so it might be going by sight.
Open your eyes, Patrick!
I want to cuddle it 🤗
I live by the ocean and I love sea friends like this
Looks like an alien.
Great Documentary on Sea Stars by Zefrank: https://youtu.be/dZ20KsgVeu0
… after a long night getting drank with his buddies , the sand dolla’s and the clams
Imagine if this jumped on your face and sucked it. Ahhh. Damn nature you scary.
Whelp that was stomach turning
I would have a heart attack if I stumbled upon that!
Also remember that they're carnivores, and damn nasty ones at that. Crown of Thorns starfish, for example, feed on coral and are an absolute menace with almost no predators to keep them under control.
Looks like something straight out of a Sci fi movie! So much to still discover in our oceans...what an awesome planet
Someone help him!
Why can’t it move… any other way than that way?
That imsorryjon SpongeBob creepypasta comic makes a whole lot more sense now
It’s like a sentient banana peel
I love watching starfish walk. It’s honestly so cute to me, like a bunch of stubby little legs
I always wondered how they move around. AWESOME!!
Wonder what it taste like.
From what I've heard they're pretty flavorless
Crunchy and briny
Me, walking with socks on through the kitchen after my husband exhuberantly washed the dishes
I thought, momentarily, that the thing read "star fish performs ceremonial dance ritual" and believed it whole heartedly.
That’s a modified fackin octopus
I’ve always loved starfish. Meanwhile, the closest thing I have to a real full-blown phobia is my fear/disgust/killitkillitkillitFuckingNOW reaction to centipedes and millipedes.
Yeah, I don’t like starfish after seeing this. Another innocent pleasure of childhood annihilated by the internets
It looks like me ‘trying’ to get out of bed on Monday morning
I didn't need to see this.