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Old Tuesday 7th July 2009, 00:45   #1
Daddylion
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Urchin ID? Sanibel Island, Florida

Found this guy washed up and was wondering what species it was (is there even more than one species of urchin? I figure there must be.)

Thanks.
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Old Tuesday 7th July 2009, 18:18   #2
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Originally Posted by Daddylion View Post
Found this guy washed up and was wondering what species it was (is there even more than one species of urchin? I figure there must be.)

Thanks.

There are thousands of species of urchin - which is unfortunately why I can't answer your question! If you can get hold of a copy of Humann and DeLoach's Reef Critters guide (there may well be a copy in a nearby public library) that may well hold the answer.
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Old Tuesday 7th July 2009, 18:24   #3
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That looks like a Purple Sea Urchin (aka Brown Rock Urchin), Arbacia punctulata. There are around 800 living species in the Class Echinoidea, which includes the cake urchins, sand dollars, and such, as well as the typical urchins.

[Edit: Posted simultaneously w/ Isurus, not in reply.]

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Old Tuesday 7th July 2009, 18:32   #4
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Thanks guys!
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Old Tuesday 7th July 2009, 20:50   #5
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Originally Posted by prattw View Post
That looks like a Purple Sea Urchin (aka Brown Rock Urchin), Arbacia punctulata. There are around 800 living species in the Class Echinoidea, which includes the cake urchins, sand dollars, and such, as well as the typical urchins.

[Edit: Posted simultaneously w/ Isurus, not in reply.]

Will

Wow - I guessed (without bothering to do any research to back it up) it would be much more than that - in the range of 2-3,000. You learn something every day!
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Old Tuesday 7th July 2009, 22:52   #6
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I was just wondering cos I'd never heard of different species of urchin. This is the first time I've ever seen a sea urchin, so it was pretty cool for me.

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Old Wednesday 8th July 2009, 13:35   #7
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That looks like a Purple Sea Urchin (aka Brown Rock Urchin), Arbacia punctulata.

Hi

It does look a bit like Arbacia but it has quite short, stubby spines which makes me wonder if it is not some other species??

O
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