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Identification schizaster XXL from France


aldo66

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Hello,
I need your help to identify this XXL schizaster!
the biggest ones that I found have the approximate size of: 2.5 inch (65 mm) but this is huge!
Found earlier this week in "zanclean" in the Pyrenees Orientales in France. The colors originate, I think, from iron oxides.
I thought of eurynotus or major but without certainty.
Thank you in advance for your input.

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Thank you very much for this idea,
however, I had some doubts because I found at least 3 distinct species of schizasteridae on this site, moreover this size of almost 95 mm greatly exceeds the known specimens of canalifera (to my knowledge) ... ova canalifera seems more globular, mine doesn't look very squashed, just flatter, but I'm not sure.
For the moment I therefore register ova canalifera sp.

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Ok thanks a lot.

By studying the growth of sea urchins, I learned that the concentric circles that we see correspond to the growth streaks, so I write "ova canalifera" on my label.

I will redo another topic with a species from the same site but very different.

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Nice, it's a big one.

theme-celtique.png.bbc4d5765974b5daba0607d157eecfed.png.7c09081f292875c94595c562a862958c.png

"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

In memory of Doren

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  • 3 weeks later...

Nice one! I have plenty of those but this one is quite special, great color!

My labels also read Ova canalifera.

 

I think we’re going to the same spot ;)

 

Cheers

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Hi,

 

It seems that Ova canalifera doesn't exist fossilized, but is a current species  https://www.marinespecies.org/aphia.php?p=taxdetails&id=1459909

 

@fifbrindacier

 

Coco

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11 minutes ago, Coco said:

Hi,

 

It seems that Ova canalifera doesn't exist fossilized, but is a current species  https://www.marinespecies.org/aphia.php?p=taxdetails&id=1459909

 

@fifbrindacier

 

Coco

I agree with @caterpillar, he's far more knowlageable than me.

I don't know if it comes from Le Boulou, but that's a nice and well preserved internal cast.

In that site it's rare if not almost impossible to find them with their test. When i was there i found a partial cast with a partial test.

theme-celtique.png.bbc4d5765974b5daba0607d157eecfed.png.7c09081f292875c94595c562a862958c.png

"On ne voit bien que par le coeur, l'essentiel est invisible pour les yeux." (Antoine de Saint-Exupéry)

"We only well see with the heart, the essential is invisible for the eyes."

 

In memory of Doren

photo-thumb-12286.jpg.878620deab804c0e4e53f3eab4625b4c.jpg

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50 minutes ago, Coco said:

Hi,

 

It seems that Ova canalifera doesn't exist fossilized, but is a current species  https://www.marinespecies.org/aphia.php?p=taxdetails&id=1459909

 

@fifbrindacier

 

Coco

Hello coco , I thought the same thing especially since in the worms it is well specified: "Fossil range: recent only"
but I trust Caterpillar, given their knowledge.

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https://erizosfosiles.jimdofree.com/búsqueda-por-épocas/neoge-pisos/plio-ir-spatangus-schiz/#ova
 

there it says that « Ova saheliensis fossil is usually mistakenly mentionned as Ova canaliferus which is only a current species »

 

And

 

http://ibdigital.uib.es/greenstone/sites/localsite/collect/bolletiHistoriaNatural/index/assoc/Bolleti_/2020v063/pdf.dir/Bolleti_2020v063.pdf

 

Page 62 also mentions O. saheliensis as the ancestral form of O. canalifera in Miocene. They seem to refer to this publication but I don’t have access:

 

https://www.researchgate.net/publication/223320398_Changing_biodiversity_of_Mediterranean_irregular_echinoids_from_the_Messinian_to_the_Present-Day

 

 

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15 minutes ago, aldo66 said:

but I trust Caterpillar, given their knowledge.

 

I do not have infused science.:Confused05:

You should see the arrangement of the pores on the anterior ambulacrum. Regularly in sahaliensis and irregularly in canalifera. The problem is that we only find internal molds and therefore difficult to see the pores.

If we consider that canalifera is essentially recent, then we can think that in the pliocene we had sahaliensis.

But as long as we cannot decide with the arrangement of the pores, the debate remains open.

I continue to call canalifera because many of my Spanish colleagues identify it as that

But Ova sp is the best identification.

 

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