Utera Posted December 16, 2019 Share Posted December 16, 2019 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? Link to comment Share on other sites More sharing options...
grandpa Posted December 16, 2019 Share Posted December 16, 2019 Clypeaster sp. Providence and age would help in species ID, if available. 2 Link to comment Share on other sites More sharing options...
Uncle Siphuncle Posted December 16, 2019 Share Posted December 16, 2019 Compare with Claviaster as well. 3 Grüße, Daniel A. Wöhr aus Südtexas "To the motivated go the spoils." Link to comment Share on other sites More sharing options...
Fossildude19 Posted December 16, 2019 Share Posted December 16, 2019 The matrix reminds me of Moroccan material. 2 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
Utera Posted December 16, 2019 Author Share Posted December 16, 2019 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. 1 Link to comment Share on other sites More sharing options...
Utera Posted December 16, 2019 Author Share Posted December 16, 2019 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. 1 Link to comment Share on other sites More sharing options...
doushantuo Posted December 16, 2019 Share Posted December 16, 2019 images from: Porter M. Kier Revision of the cassiduloid echinoids SMithsonian Miscellaneous collections,144/3 NOTE: taxonomy MAY be outdated 2 Link to comment Share on other sites More sharing options...
Coco Posted December 16, 2019 Share Posted December 16, 2019 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 1 ---------------------- 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... Link to comment Share on other sites More sharing options...
Utera Posted December 16, 2019 Author Share Posted December 16, 2019 Thank you for the information. I now know some echinoderm vocabulary. I'll keep that in mind. Thanks! Link to comment Share on other sites More sharing options...
doushantuo Posted December 16, 2019 Share Posted December 16, 2019 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 1 Link to comment Share on other sites More sharing options...
Coco Posted December 16, 2019 Share Posted December 16, 2019 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... Link to comment Share on other sites More sharing options...
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