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How would an arthropod (invertebrate animals with an exoskeleton)replace and or evolve into a fish-like animal (using terrestrial fish as an example)the question is how would they recrate a ocean environment and have a fish like body

Please note these creatures just evolved from a ancestor with similar features as a arthropod but you can use real arthropods if its for research.

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    $\begingroup$ Sanchez the regulars here are a bunch of grumpy old folks. We like sentences and capitalization and punctuation like they used to have back in the 2010s. It is good practice for you too. You have potential. If you are smart enough to come up with schemes like this you are smart enough to write (and spellcheck) paragraphs for other smart people to read. Write a paragraph about your beast that makes people who love alien beasts want to get involved. I love a weird alien critter more than most but when I see a block of lame text like this I don't want to play. $\endgroup$
    – Willk
    Oct 19, 2021 at 0:14
  • $\begingroup$ duely noted.but t warn you im not good at spelling no matter how hard i try $\endgroup$
    – Erik Sanchez
    Oct 19, 2021 at 0:20
  • $\begingroup$ Duely noted.i shall try my best but for the love of my life i just can`t spell sometimes $\endgroup$
    – Erik Sanchez
    Oct 19, 2021 at 0:25
  • $\begingroup$ That's alright! Do your very best to present yourself positively when you write questions in here (and indeed everywhere else in your online life, because in the real world, you only set yourself up for failure by not presenting a well written & reasonably well spelled piece of communication). After you write a question (or answer) do your best to review it and edit it. After you give editing a try or two, someone else will come along and clean up the damage! Keep in mind: your communications skill don't just reflect on you; they also reflect on the community and from now into the future. $\endgroup$
    – elemtilas
    Oct 19, 2021 at 0:26
  • $\begingroup$ Apart from spelling & punctuation: would you be so kind as to add a link to a previous query in which you describe your world? I have no idea what the "world with the claw thing" refers to! $\endgroup$
    – elemtilas
    Oct 19, 2021 at 0:29

2 Answers 2

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1: Shrimp compete with fish.

https://apps-nefsc.fisheries.noaa.gov/rcb/photogallery/shrimp.html

shrimp

Here is an example of an arthropod body plan evolved to be a match with fish. Maybe not esoteric enough for your needs but the real deal.

2: Swimming bug x armored fish.

But let us get more awesome. We will start with the most water adapted insect I can think of: the Belostoma water bug.

water bub

https://bugguide.net/node/view/626889/bgimage

And we will take a page from the playbook of the Devonian armorer fishes like Dunkles here.

dunks

https://en.wikipedia.org/wiki/Dunkleosteus

Of course the armor is not bony plates but exoskeleton.

The result: a swimming bug with grabbing appendages, body armor and a wicked bite. These things would be too heavily armored to fly but the shrimp are ok with that.

Drawing to come, I hope!

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  • $\begingroup$ thanks for the informating when i do draw them ill make sure to send them here $\endgroup$
    – Erik Sanchez
    Oct 19, 2021 at 13:43
  • $\begingroup$ Does a crustacean looking like sushi count? I mean... technically the central piece of sushi is fish. $\endgroup$
    – Adrian Colomitchi
    Oct 25, 2021 at 9:37
  • $\begingroup$ i would say so in my honnest opinoin $\endgroup$
    – Erik Sanchez
    Nov 14, 2021 at 5:08
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evhjejrebk

This is a crustacean from the genus Triops. It isn't quite fish-like at the moment but it does look quite similar to some ancient armored fishes.

enter image description here

Bothriolepis

enter image description here

Cephalaspis

All of those little tendrils and feathery protrusions and legs could be simplified into paddle-like fins.

enter image description here

This is a pentastomid, or a "tongue worm." It may look like some kind of flatworm but it is actually a parasitic crustacean. It doesn't look like a traditional fish but it could pass for an eel or perhaps a ray-like fish if the flaps on the side were more pronounced.

BTW Jupiter already has a moon called Europa.

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  • $\begingroup$ thank you for the information also i forgot the name of my planet looked through and found it its name is actualy chlorea $\endgroup$
    – Erik Sanchez
    Oct 24, 2021 at 18:50

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