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Copernicrinus zamorae *** ***.,the oldest thiolliericrinid crinoid(Crinoidea,Echinodermata) from the Bajocian strata of Algeria,Africa

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Journal of Palaeogeography 2024年第2期13卷 237-251页

作者： Bartosz J.Pιachno Madani Benyoucef Fayc al Mekki Mohammed Adaci Imad Bouchemla sreepat jain Marcin Krajewski Mariusz A.Salamon Faculty of Biology Institute of BotanyJagiellonian University in KrakowGronostajowa Street 930-387 KrakowPoland Laboratoire de Géomatique Ecologie et EnvironnementMustapha Stambouli University of MascaraDZ-29000 MascaraAlgeria Abou Bekr Belkaid University of Tlemcen TlemcenAlgeria Department of Geological Sciences Faculty of Biological and Agricultural SciencesMouloud Mammeri University of Tizi-OuzouTizi-OuzouAlgeria Adama Science and Technology University School of Applied Natural SciencesDepartment of Applied GeologyP.O.Box 1888AdamaEthiopia Faculty of Geology Geophysics and Environmental ProtectionAGH University of Science and TechnologyAl.A.Mickiewicza 30PL-30-059KrakowPoland Faculty of Natural Sciences University of Silesia in KatowiceBedzinska Street 60PL-41-200 SosnowiecPoland

The thiolliericrinids(Thiolliericrinidae) are comatulids(Comatulida),which retained their stalks as ***,we report a centrodorsal from the Bajocian strata(Middle Jurassic) of the Djebel Kérdacha area,northwestern Algeria(Africa).It is the first thiolliericrinid report from outside of Europe and also the oldest representative of the Thiolliericrinidae whose first occurrence is from the *** crinoid is assigned to Copernicrinus zamorae *** *** reported new taxon shows strong similarities with the stemless ‘true’comatulids,Solanocrinites;the only difference is the presence of a facet to the stem in *** closest comparable thiolliericrinid to Copernicrinus is the Oxfordian Thiolliericrinus,interpreted as a descendant of the *** origin and overview of all thiolliericrinid representatives are also discussed herein.

关键词： Thiolliericrinidae Crinoids Coral facies Bajocian Jurassic Algeria Southern Tethys margin

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Sheltered preservation of cyrtocrinid crinoids from the Lower Cretaceous of Madagascar and their palaeogeographic significance

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Journal of Palaeogeography 2023年第1期12卷 69-81页

作者： Mariusz A.Salamon sreepat jain Marcin Krajewski Piotr Duda Bruno Ferre Mohamed Benzaggagh Bartosz J.Plachno University of Silesia in Katowice Faculty of Natural SciencesBedzinska 60PL-41-200 SosnowiecPoland Department of Geology School of Applied Natural ScienceAdama Science and Technology UniversityETH-1888 AdamaOromiaEthiopia AGH University of Science and Technology Faculty of GeologyGeophysics and Environmental ProtectionAl.A.Mickiewicza 30PL-30-059 KrakowPoland University of Silesia in Katowice Faculty of Science and TechnologyBedzinska Street 3941-200 SosnowiecPoland 2 rue Guy de Maupassant F-76800 SaintEtienne du RouvrayFrance Universite Moulay Ismail Faculte des SciencesDepartement de GeologieBP 11.201ZitouneMeknesMorocco Jagiellonian University in Krakow Faculty of BiologyInstitute of BotanyGronostajowa Street 9PL-30-387 CracowPoland

Sheltered preservation,in which organisms are trapped within shells of cephalopods,is a wellknown *** preservational style constitutes an important source of paleontological ***,we report the first crinoid preserved inside the early Albian ammonite Cleoniceras besairiei Collignon from *** crinoid is assigned to the aspidocrinid phyllocrinid(Apsidocrinus,Phyllocrinidae),and constitutes the first phyllocrinid from the African continent,the second from the southern margin of the Tethys(after New Zealand),and also from the southern *** specimen represents the youngest occurrence of a phyllocrinid in the world as well,and constitutes one of the youngest occurrences of cyrtocrinids from shallow sea environments,before predation-induced migration of the stalked crinoids to the deep sea refugia due to the so-called Mesozoic Marine *** finding highlights that ammonite shells may also be a convenient material for studying echinoderms.

关键词： Echinoderms Crinoids Cyrtocrinids Cretaceous Madagascar Africa

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