moroplogo Posted December 4, 2016 Share Posted December 4, 2016 Hello, I search the name of an urchin that I publish a 3D model on sketchfab. Thank you for your help! https://sketchfab.com/models/2bc77a3ab36248deb14c6132ae73106f 1 Link to comment Share on other sites More sharing options...
M Harvey Posted December 5, 2016 Share Posted December 5, 2016 really like the graphics. Closest thing to actually holding the specimen. Link to comment Share on other sites More sharing options...
Max-fossils Posted December 5, 2016 Share Posted December 5, 2016 Welcome to !!! Is Echinolampas a possibility? What will really help is to know where it was found and the age of the fossil. Anyways great specimen! Best regards, Max Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
moroplogo Posted December 5, 2016 Author Share Posted December 5, 2016 Thank you M.Harvey and Max for your compliment. I don't know where the fossil was found and his age. It would seem to me instead that it belonged to the order of Clypeasteroida . Link to comment Share on other sites More sharing options...
JohnJ Posted December 5, 2016 Share Posted December 5, 2016 You might also upload some clear photos to assist with the ID. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
moroplogo Posted December 5, 2016 Author Share Posted December 5, 2016 These are the photos of this fossil 2 Link to comment Share on other sites More sharing options...
Max-fossils Posted December 6, 2016 Share Posted December 6, 2016 Oooh, I fear this might not be a fossil, judging by the fact that light is passing through the urchin... Well, what I know is that if light passes through a potentially fossil seashell, there's a very big chance it's not a fossil. I'm not sure if the same goes for urchins, but it probably does. Let's see what the experts have to say... Best regards, Max 1 Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
ynot Posted December 6, 2016 Share Posted December 6, 2016 11 minutes ago, Max-fossils said: if light passes through a potentially fossil seashell, there's a very big chance it's not a fossil. Very dependent on what the replacing mineral is. Many fossils replaced with calcite or quartz will allow the light to pass through. 1 Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
Max-fossils Posted December 6, 2016 Share Posted December 6, 2016 10 minutes ago, ynot said: Very dependent on what the replacing mineral is. Many fossils replaced with calcite or quartz will allow the light to pass through. Ah okay, I didn't know that. Thanks for telling me! And @moroplogo, sorry about what I just said, it might very well be wrong... Warm regards, Max Max Derème "I feel an echo of the lightning each time I find a fossil. [...] That is why I am a hunter: to feel that bolt of lightning every day." - Mary Anning >< Remarkable Creatures, Tracy Chevalier Instagram: @world_of_fossils Link to comment Share on other sites More sharing options...
Al Dente Posted December 6, 2016 Share Posted December 6, 2016 I think it is a modern Clypeaster. 2 Link to comment Share on other sites More sharing options...
tmaier Posted December 6, 2016 Share Posted December 6, 2016 Yeah, likely the extant species Clypeaster rosaceus. They are common around the Caribbean. This specimen has some white powder clinging to it... powdery limestone? Maybe it was buried in loose marine lime and then dug up, and called a fossil? Maybe it is a very old specimen of the extant species. So then everybody can debate what is a fossil again... 1 Link to comment Share on other sites More sharing options...
moroplogo Posted December 8, 2016 Author Share Posted December 8, 2016 Thank you @tmaier for your help . You think really that this test was buried in loose marine lime then there are only some spots ? Interesting ! Link to comment Share on other sites More sharing options...
sdsnl Posted December 8, 2016 Share Posted December 8, 2016 I would guess that the white stuff is encrusting bryozoan. I agree that it is an extant Clypeaster rosaceus. It looks too thin and empty (unless it has been washed very thoroughly) to be a fossil. But, if it has indeed been covered by limestone, then I guess it would be a young fossil. 1 Link to comment Share on other sites More sharing options...
moroplogo Posted December 8, 2016 Author Share Posted December 8, 2016 Thank you @sdsnl . I also think that it is an clypeaster rosaceus but when I see this page https://fr.wikipedia.org/wiki/Clypeaster_rosaceus I have my doubts ! There are also a little snail on the back of this test. Link to comment Share on other sites More sharing options...
sdsnl Posted December 9, 2016 Share Posted December 9, 2016 2 hours ago, moroplogo said: Thank you @sdsnl . I also think that it is an clypeaster rosaceus but when I see this page https://fr.wikipedia.org/wiki/Clypeaster_rosaceus I have my doubts ! There are also a little snail on the back of this test. May you explain why you have doubts of the ID? Do you see something on the test that doesn't fit the description of Clypeaster rosaceus? Some gastropods can encrust themselves on other shells, rocks, etc. The one you have looks very similar to a species I have seen encrusting on my extant shells from Japan and Taiwan, but have yet to find ID for it. You also have some tube worms on the test. If it is the species I remember from having on some shells in my old fish tank, its feeding arms are like a fan and red in color. 2 Link to comment Share on other sites More sharing options...
abyssunder Posted December 10, 2016 Share Posted December 10, 2016 It is a modern one. This is a fossil. 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
moroplogo Posted December 11, 2016 Author Share Posted December 11, 2016 On 09/12/2016 at 1:32 AM, sdsnl said: May you explain why you have doubts of the ID? Do you see something on the test that doesn't fit the description of Clypeaster rosaceus? When we see this image https://commons.wikimedia.org/wiki/File:Clypeaster_rosaceus_(San_Salvador_Island,_Bahamas)_3.jpg we notice a structure of polygonal (hexagonal) lines that does'nt exist on my test. Link to comment Share on other sites More sharing options...
sdsnl Posted December 12, 2016 Share Posted December 12, 2016 4 hours ago, moroplogo said: When we see this image https://commons.wikimedia.org/wiki/File:Clypeaster_rosaceus_(San_Salvador_Island,_Bahamas)_3.jpg we notice a structure of polygonal (hexagonal) lines that does'nt exist on my test. Your test has them too. Wet your test, it will help you see them. Those are the plates and exist in all echinoids. They grow bigger by growing new plates from near the mouth (and each plate grows bigger every year too). A certain kind of preservation makes the plates make apparent in fossils. I'm not sure how it happens, but my guess would be that when the test is a little crushed by the weight of the matrix, making the plates a bit loose but not enough to fall apart, sendiment would get in between the cracks, darkening them and highlighting the plates. 1 Link to comment Share on other sites More sharing options...
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