GallinaPinta Posted October 8, 2019 Share Posted October 8, 2019 So I found this specimen by the river in san sebastian and according to https://www.jstor.org/stable/1301379?read-now=1&seq=5#page_scan_tab_contents it could be either Echinometra lucunter or belonging to Thylechinus. Both of these specimens (supposedly both specimens have only been found once in Puerto Rico) look alike so much according to my recent searches that im now more confused than ever. Any expert out there who can help? Link to comment Share on other sites More sharing options...
caterpillar Posted October 8, 2019 Share Posted October 8, 2019 Thylechinus is found in upper cretaceous/oligocene level Echinometra appears in miocene level to recent. You have to know exactly the level. But for me it's not Echinometra. 2 http://www.paleotheque.fr Link to comment Share on other sites More sharing options...
Coco Posted October 8, 2019 Share Posted October 8, 2019 OK with Caterpilar, I don't think it is Echinometra : http://www.echinologia.com/galeries/echinometridae/index.html Oval test and not round among others. Coco 2 ---------------------- 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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