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November 28, 2011
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Sea Urchin Anatomy by Abiogenisis Sea Urchin Anatomy by Abiogenisis
[This image is available for purchase, and alternations can be made on request]

Illustrated is the generalised internal and external features of a typical arbacia-type sea urchin. Several features such as gills and the pedicilaria were omitted as they are outside the scope of this image.

Sea urchins are globular, superficially pentamerically symmetrical echinoderms which inhabit marine environments world wide. Movement across the substrate can be made in one or both of two ways: The defensive spines can be moved independently and thus act as mobile stilts in the long spined species, or the hydraulically extended tube-feet can be employed for both mobility and anchorage.

These tube feet are part of an internal network of water filled tubes and bladders called the water vascular system. This network is connected to the seawater via a structure called the madreporite on the aboral (upper) surface: When the bladders along the radial canals contract, they inflate and thus extend the tube feet.

The sea urchin feeding apparatus is a five sided complex articulated structure called the Aristotles' Lantern. It consists of a series of interlinked plates and muscles which manoeuvre five continuously growing teeth, used to rasp away at algae, their predominant food source.

The nervous system is relatively simple, centred around a nerve ring inside the lantern from which radiate five nerves to innervate the radial water vascular system.
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:iconquadroblitz:
Quadroblitz Featured By Owner Edited Jun 19, 2014  Hobbyist Traditional Artist
It looks like a space pod. Like the blue things are seats there's a light at the top and I dunno, air conditioning over there. And there's a control panel in the middle.
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:iconabiogenisis:
Abiogenisis Featured By Owner Jun 23, 2014
So utterly strange.
Reply
:iconquadroblitz:
Quadroblitz Featured By Owner Jun 23, 2014  Hobbyist Traditional Artist
Yea I guess it is.
Reply
:iconjpilbrow:
jpilbrow Featured By Owner Jan 29, 2014
Hi, I am looking for an image illustrating sea urchin morphology to use for my PhD thesis and this is the best that I have come across. The thesis is for academic use only, it will not be sold or reproduced, but a copy may be available to view online and in the university library, proper credit for the image will be given. Please email me in regards to this ASAP at piljo321@student.otago.ac.nz. Thanks Jodi   
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:iconxsonohx:
XSONOHX Featured By Owner Nov 14, 2013  Hobbyist Traditional Artist
I was looking at pictures of Sea Urchins and found this, looks cool.
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:iconabiogenisis:
Abiogenisis Featured By Owner Nov 19, 2013
Cheers, it was one of the hardest and most enjoyable projects I ever did :)
Reply
:iconhannahelizabethh:
hannahelizabethh Featured By Owner Nov 8, 2013  Student General Artist
is this anatomically/scientifically/body parts correct to the real ones in the ocean?? cause its sooo cool! :D  
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:iconabiogenisis:
Abiogenisis Featured By Owner Nov 11, 2013
They should be! I tried to find as much research material as I could :P
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:iconhannahelizabethh:
hannahelizabethh Featured By Owner Nov 12, 2013  Student General Artist
SWEET! :D
Reply
:iconjustin5578:
justin5578 Featured By Owner Oct 22, 2013
As a scuba diver in Southern California I'm all too familiar with urchins as they have decimated kelp forests (thanks to humans taking their natural predators), I am however fascinated by them.  I have a collection of sea urchin tests (skeletons) that I have collected on my many dives.  I have to say your picture makes me all the more fascinated.  Nice work.
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:iconabiogenisis:
Abiogenisis Featured By Owner Oct 22, 2013
In Tasmania, I believe it was removing the lobsters that unleashed the urchin.
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:iconjustin5578:
justin5578 Featured By Owner Oct 23, 2013
Same here in California, that, sea otters and a fish called a sheephead.  I've done volunteer work trying to restore kelp forests.  It hard diving, removing thousands upon thousands of urchins.  California has protected more and more coast line from taking lobsters and sea otters are making their way down from the north, maybe one day balance will be restored.
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:iconabiogenisis:
Abiogenisis Featured By Owner Oct 24, 2013
Apparently what they did in Tasmania was breed and then re-introduce huge numbers of crayfish back into the environment.
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:iconmysticm:
MysticM Featured By Owner Jun 14, 2013
I looked for this diagram after watching a video on how the japanese eat the gonads.

I never really considered there was to them than a ball of spikes
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:iconabiogenisis:
Abiogenisis Featured By Owner Jun 20, 2013
Inside they are a work of art.
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:iconmysticm:
MysticM Featured By Owner Jun 20, 2013
I dunno any photo sites on there insides.
Reply
:iconabiogenisis:
Abiogenisis Featured By Owner Jun 23, 2013
Mostly I worked from anatomy diagrams.
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:iconmysticm:
MysticM Featured By Owner Jun 23, 2013
Ah 'k.
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:iconomnipsionic:
omnipsionic Featured By Owner Mar 10, 2013
So, another silly question, but one I need to know the answer too.
Can they bite?
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:iconabiogenisis:
Abiogenisis Featured By Owner Mar 13, 2013
Ha I think they could, but they move so slowly I dont think they ever have bitten anyone! They rely on their spines and poison for defences, they probably dont really know how to bite.
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:iconomnipsionic:
omnipsionic Featured By Owner Mar 14, 2013
That just makes me smile XD
Thanks for the info x3
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:iconabiogenisis:
Abiogenisis Featured By Owner Mar 14, 2013
:P
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:iconthyanna:
Thyanna Featured By Owner Jan 13, 2013
Lindíssimo!!!
Reply
:iconsabertoothdogfish:
SabertoothDogfish Featured By Owner Dec 11, 2012  Hobbyist General Artist
heh... gonads...
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:iconkitsune-of-awesome:
Kitsune-of-Awesome Featured By Owner Oct 26, 2012  Student Traditional Artist
So how do they have sex?

(I like to ask my science teachers this question)
Reply
:iconomnipsionic:
omnipsionic Featured By Owner Mar 10, 2013
Painfully.
Reply
:iconabiogenisis:
Abiogenisis Featured By Owner Oct 27, 2012
I think they just dump sperm and eggs out the top of their bodies in clouds and hope they mix.
Reply
:iconsolomen:
Solomen Featured By Owner Sep 16, 2012  Hobbyist Digital Artist
Now if it had methane, hydrogen or helium bladders it would be a metroid :D
Reply
:iconalex-brady-tad:
Alex-Brady-TAD Featured By Owner Sep 7, 2012  Professional Digital Artist
lovely illustration. im a big fan of echinoderms. the formation of the radially symmetric adults [i]within[/i] rather than from the bilaterally symmetric free-swimming larva.... there is a fascinating piece of biological history waiting to be told there.
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:iconbumsy:
Bumsy Featured By Owner Aug 9, 2012
Its arse is on its head? I always thought that was its mouth.
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:iconabiogenisis:
Abiogenisis Featured By Owner Aug 9, 2012
The head faces the ground, and the anus fires waste up and away like a chimney
Reply
:iconpalaeorigamipete:
palaeorigamipete Featured By Owner Apr 6, 2012  Hobbyist General Artist
so the black "hose" is the intestine, but what is the brown-ish/green-ish "hose"? Is it an intestine too?
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:iconabiogenisis:
Abiogenisis Featured By Owner Apr 7, 2012
They are parts of the same tube, I just cut out a section so you can see the mouthparts behind it :)
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:iconpalaeorigamipete:
palaeorigamipete Featured By Owner Apr 7, 2012  Hobbyist General Artist
:ohmygod: i'm a dummy! XD
Reply
:iconharlequinhybrid:
harlequinhybrid Featured By Owner Jan 17, 2012   Artisan Crafter
this is really really good, like a lot of your stuff
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:iconabiogenisis:
Abiogenisis Featured By Owner Jan 17, 2012
Thanks :)
Reply
:iconliciandragon:
LicianDragon Featured By Owner Jan 10, 2012  Hobbyist Digital Artist
This is awesome! Better then the anatomy illustrations in my college textbooks!
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:iconabiogenisis:
Abiogenisis Featured By Owner Jan 10, 2012
Thanks, hopefully as accurate ;D
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:iconimmy-is-thinking:
Immy-is-Thinking Featured By Owner Jan 7, 2012  Professional Traditional Artist
Hello :wave: this is featured here - [link] :heart:
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:iconabiogenisis:
Abiogenisis Featured By Owner Jan 7, 2012
Thanks :D
Reply
:icontysirr:
Tysirr Featured By Owner Dec 31, 2011  Hobbyist Digital Artist
Looks like Spaceship :) Cool spaceship :P
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:iconmuffin-wrangler:
muffin-wrangler Featured By Owner Dec 30, 2011
Brilliant. This is pretty to look at, and very clear in its purpose. A great example of what scientific illustration should be.
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:iconabiogenisis:
Abiogenisis Featured By Owner Dec 30, 2011
Thanks, thats the way I like it too :)
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:iconnbadges:
NBadges Featured By Owner Dec 15, 2011
Very cool to see!! THanks for sharing!:)
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:iconsaurabhinator:
Saurabhinator Featured By Owner Dec 5, 2011  Hobbyist Digital Artist
You are such a wild man.
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:iconmustardofdoom:
mustardofdoom Featured By Owner Dec 3, 2011  Student Traditional Artist
You detailed the Aristotles' Lantern quite nicely :)
Reply
:iconalanralph:
AlanRalph Featured By Owner Dec 3, 2011  Professional General Artist
Based on the positions of its anus, this means that if you're snorkelling or scuba-diving and spot an urchin, it's most likely mooning at you! :D
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:iconalexlyoko13:
alexlyoko13 Featured By Owner Dec 3, 2011
It's So Adorable!
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:iconconntrast:
Conntrast Featured By Owner Dec 1, 2011
Fantastic. Was this commissioned by a publisher? I would be ecstatic if an invertebrate zoology textbook came out with your illustrations.
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:iconabiogenisis:
Abiogenisis Featured By Owner Dec 1, 2011
Actually nope, just did it for fun :P
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