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Utera

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I bought this at a fossil and rock show at my local state fair, I did not get any identification on it besides "Sea Biscuit". Can anyone help me?

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Compare with Claviaster as well.

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Grüße,

Daniel A. Wöhr aus Südtexas

"To the motivated go the spoils."

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The matrix reminds me of Moroccan material.  :zzzzscratchchin:

 

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    Tim    -  VETERAN SHALE SPLITTER

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I just looked at Clypeaster and compared mine with a variety of species. My specimen doesn't seem to have the "puffy" ness like other Clypeaster specimens do have. I looked at Claviaster, they do look extremely similar.

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As well as, I don't know echinoderm vocabulary, the "holes" don't line up the same as Clypeaster. I noticed that in Clypeaster specimens, the "holes" seem to make an elongated U shape. While in Claviaster, they seem to come to a sharp V shape. Mine also comes to a sharp V shape.

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images from:

Porter M. Kier

Revision of the cassiduloid echinoids

SMithsonian Miscellaneous collections,144/3

 

 

 

 

claviaspl23kiercassidsmithsonianmisce1441962smit_0533.jpg

kiererstpt77hianmisce1061947smit_0416.jpg

NOTE: taxonomy MAY be outdated

 

 

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Hi,

 

1 hour ago, Utera said:

I don't know echinoderm vocabulary, the "holes" don't line up the same as Clypeaster. I noticed that in Clypeaster specimens, the "holes" seem to make an elongated U shape. While in Claviaster, they seem to come to a sharp V shape. Mine also comes to a sharp V shape.

 

I can't help you, but holes are :

 

- "peristome" (in french but could be the same in english) -> mouth,

- "periproct" -> anus.

 

On "regular" sea urchins they are placed in a perfectly vertical axis (periprocte at the centre above and peristome at the middle below). On "irregular" sea urchins the peristoma is always below the center and the periprocte may be on top or on the underside, near the peristoma or not depending on the species. Yours is an irregular sea urchin.
 
Coco
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----------------------
OUTIL POUR MESURER VOS FOSSILES : ici

Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

Badges-IPFOTH.jpg.f4a8635cda47a3cc506743a8aabce700.jpg Badges-MOTM.jpg.461001e1a9db5dc29ca1c07a041a1a86.jpg

 

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Regularity_in_irregular_echinoids.pdf

J. Math. Biol. 44, 330–340 (2002) Mathematical Biology
M. Torres , J.L. Aragon, · P. Dominguez , D. Gil
Regularity in irregular echinoids

@Coco

some of you may like:

Saucedeetal2007Irregularia.pdf

Geol. Mag. 144 (2), 2007, pp. 333–359.

Phylogeny and origin of Jurassic irregular echinoids(Echinodermata: Echinoidea)
THOMAS SAUCedE , RICH MOOI & BRUNO DAVID

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:dinothumb:

 

Coco

----------------------
OUTIL POUR MESURER VOS FOSSILES : ici

Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

Badges-IPFOTH.jpg.f4a8635cda47a3cc506743a8aabce700.jpg Badges-MOTM.jpg.461001e1a9db5dc29ca1c07a041a1a86.jpg

 

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