Notidanodon Posted April 3, 2020 Share Posted April 3, 2020 Hi guys do you think you could get this to a species level, might be being a bit picky but I thought it was worth a try it’s 3cmlong and 1.3 cm tall sorry if the photos were bad I tried my best Link to comment Share on other sites More sharing options...
JohnJ Posted April 10, 2020 Share Posted April 10, 2020 Are the tubercles perforate? The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Notidanodon Posted April 11, 2020 Author Share Posted April 11, 2020 14 hours ago, JohnJ said: Are the tubercles perforate? Hi john, does that mean do they have holes in? Link to comment Share on other sites More sharing options...
caterpillar Posted April 11, 2020 Share Posted April 11, 2020 Yes. If not perforate it's a Phymosomatidae 2 http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
Notidanodon Posted April 12, 2020 Author Share Posted April 12, 2020 20 hours ago, caterpillar said: Yes. If not perforate it's a Phymosomatidae I will have a look Link to comment Share on other sites More sharing options...
Notidanodon Posted April 13, 2020 Author Share Posted April 13, 2020 On 10/04/2020 at 9:48 PM, JohnJ said: Are the tubercles perforate? On 11/04/2020 at 5:31 PM, caterpillar said: Yes. If not perforate it's a Phymosomatidae Yes they aren’t perforated they are like small pinnules on the end Link to comment Share on other sites More sharing options...
caterpillar Posted April 13, 2020 Share Posted April 13, 2020 As I can see it could be a Polydiadema http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
caterpillar Posted April 13, 2020 Share Posted April 13, 2020 Sorry. I just see that Polydiadema has perfored tubercules. So It could be Trochalosoma 2 http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
JohnJ Posted April 13, 2020 Share Posted April 13, 2020 15 minutes ago, caterpillar said: So It could be Trochalosoma Quite possible. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Notidanodon Posted April 14, 2020 Author Share Posted April 14, 2020 On 13/04/2020 at 5:06 PM, caterpillar said: Sorry. I just see that Polydiadema has perfored tubercules. So It could be Trochalosoma So we can get it to trochalosoma spp Link to comment Share on other sites More sharing options...
JohnJ Posted April 14, 2020 Share Posted April 14, 2020 4 minutes ago, will stevenson said: So we can get it to trochalosoma spp Do some comparative research. Echinoid identification from you photos would be difficult. Even with the specimen in hand, it is often not easy. 1 The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Notidanodon Posted April 14, 2020 Author Share Posted April 14, 2020 3 minutes ago, JohnJ said: Do some comparative research. Echinoid identification from you photos would be difficult. Even with the specimen in hand, it is often not easy. Doesn’t it seem a bit wide Link to comment Share on other sites More sharing options...
JohnJ Posted April 14, 2020 Share Posted April 14, 2020 Will, you are drawing conclusions from sketches of one species. Research the different known species and the diagnostic features to make a better diagnosis. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
Notidanodon Posted April 14, 2020 Author Share Posted April 14, 2020 18 minutes ago, JohnJ said: Will, you are drawing conclusions from sketches of one species. Research the different known species and the diagnostic features to make a better diagnosis. Oops didn’t realise it wasn’t a specific species, sorry I am better at identifying shark teeth, never tried it with an echinoid so not familiar with names 1 Link to comment Share on other sites More sharing options...
caterpillar Posted April 15, 2020 Share Posted April 15, 2020 If you want to identify a sea urchin, you have to look at all the characteristics. In these photos, we do not distinguish much. You have the sea urchin in hand and you have to compare with everything that is marked on the Trochalosoma desciption. Also you should know in which geological level you found this sea urchin. 1 http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
Notidanodon Posted April 16, 2020 Author Share Posted April 16, 2020 On 15/04/2020 at 8:35 AM, caterpillar said: If you want to identify a sea urchin, you have to look at all the characteristics. In these photos, we do not distinguish much. You have the sea urchin in hand and you have to compare with everything that is marked on the Trochalosoma desciption. Also you should know in which geological level you found this sea urchin. i will put some more time into research but here is the formation Zig Zag Chalk Formation (Cenomanian stage of c.96 Mya) white chalk sub group i think it could be phymosoma koenigi as trochalosoma doesnt occur according to my research in englands cenomian Link to comment Share on other sites More sharing options...
caterpillar Posted April 17, 2020 Share Posted April 17, 2020 Yes. If it's cenomanian stage Phymosoma is a good candidate. But if it's Phymosoma, pore-pairs are biserially arranged aborally. Take a look at your echinid https://www.nhm.ac.uk/our-science/data/echinoid-directory/taxa/specimen.jsp?id=5681 http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
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