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Journal of Palaeogeography  2024, Vol. 13 Issue (2): 237-251    DOI: 10.1016/j.jop.2024.02.001
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Copernicrinus zamori gen. et sp. nov., the oldest thiolliericrinid crinoid (Crinoidea, Echinodermata) from the Bajocian strata of northwestern Algeria, Africa
Bartosz J. Płachnoa, Madani Benyoucefb, Fayçal Mekkib, Mohammed Adacic, Imad Bouchemlab,d, Sreepat Jaine, Marcin Krajewskif, Mariusz A. Salamong,*
aFaculty of Biology, Institute of Botany, Jagiellonian University in Kraków, Gronostajowa Street 9, 30-387 Kraków, Poland;
bLaboratoire de Géomatique, Écologie et Environnement, Mustapha Stambouli University of Mascara, DZ-29000 Mascara, Algeria ;
cAbou Bekr Belkaïd University of Tlemcen, Tlemcen, Algeria;
dDepartment of Geological Sciences, Faculty of Biological and Agricultural Sciences, Mouloud Mammeri University of Tizi-Ouzou, Tizi-Ouzou, Algeria;
eAdama Science and Technology University, School of Applied Natural Sciences, Department of Applied Geology, P.O. Box 1888, Adama, Ethiopia;
fFaculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Al. A. Mickiewicza 30, PL-30-059, Kraków, Poland;
gFaculty of Natural Sciences, University of Silesia in Katowice, Będzińska Street 60, PL-41-200 Sosnowiec, Poland

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Abstract  

The thiolliericrinids (Thiolliericrinidae) are comatulids (Comatulida), which retained their stalks as adults. Here, we report a centrodorsal from the Bajocian strata (Middle Jurassic) of the Djebel Kérdacha area, northwestern Algeria (northwestern 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 Oxfordian. The crinoid is assigned to Copernicrinus zamori gen. et sp. nov. The 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 Copernicrinus. The closest comparable thiolliericrinid to Copernicrinus is the Oxfordian Thiolliericrinus, interpreted as a descendant of the latter. The origin and overview of all thiolliericrinid representatives are also discussed herein.

Key wordsThiolliericrinidae      Crinoids      Coral facies      Bajocian      Jurassic      Algeria      Southern Tethys margin     
Received: 15 October 2023     
Corresponding Authors: *E-mail address: paleo.crinoids@poczta.fm; ORCID: http://orcid.org/0000-0001-5579-5101 (M. Salamon).   
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http://journal09.magtechjournal.com/Jweb_jop/EN/10.1016/j.jop.2024.02.001     OR     http://journal09.magtechjournal.com/Jweb_jop/EN/Y2024/V13/I2/237
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