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24. Jurassic and Cretaceous crinoids (Crinoidea, Echinodermata) from the southern Tethys margin (northern and eastern Africa, and southern Asia)

Author

Salamon, Mariusz A., Benyoucef, Madani, Jain, Sreepat, Benzaggagh, Mohamed, Płachno, Bartosz J., Abdelhamid, Marouf A. M., Ahmad, Fayez, Azar, Dany, Bouchemla, Imad, Brachaniec, Tomasz, El Ouali, Mohamed, El Qot, Gamal, Ferré, Bruno, Gorzelak, Przemysław, Krajewski, Marcin, Klompmaker, Adiël A., Mekki, Fayçal, Paszcza, Karolina, Poatskievick-Pierezan, Bruna, Slami, Rafika, and Hoşgör, İzzet

Abstract

This article focuses on Jurassic and Cretaceous crinoids found in the central part of the southern Tethys shelf. The specimens presented herein come from African and Asian countries (from west to east: Morocco, Algeria, Egypt, Ethiopia, Kenya, Lebanon, Jordan, Madagascar, and India). These records are based on the study of over 30,000 crinoid remains, including cups, thecae, centrodorsals, radials, basals, brachials, columnals, pluricolumnals, cirri, and cirrals. Among the stalked crinoids, 36 isocrinid, 7 cyrtocrinid, 8 comatulid, 1 incertae sedis, and several millericrinid taxa were recorded from northern and eastern Africa, the Middle East, and India. The free-swimming roveacrinids are represented by 39 taxa. We note that the number of millericrinid taxa has been overestimated and, hence, this group requires a thorough reevaluation. All crinoids were classified as stalked isocrinids, Isocrinida (Seirocrinus subangularis Balanocrinus subteres B. pentagonalis B. gillieroni B. cf. ticinensis Percevalicrinus sp., P. aldingeri, Isocrininae indet., Isocrinus legeri I. nicoleti I. dumortieri I.? lissajouxi I.? granosus, Chariocrinus andreae C. basaltiformis Pentacrinites sp.), cyrtocrinids, Cyrtocrinida (Cyrtocrinina indet., Eugeniacrinites sp., Apsidocrinus sp., Phyllocrinus belbekensis Ticinocrinus moroccoensis Hemibrachiocrinus sp.), comatulids, Comatulida (Bourgueticrinus sp., Ausichicrinites zelenskyyi Semiometra algeriana n. sp., Comatulina infracretaceus Copernicrinus zamorae, Comaturella pinnulata), and millericrinids, Millericrinida (Millericrinida fam. et gen. indet, Millericrinus annulatus M. charpyi M. horridus, and M. munsterianus). The remains of free-swimming roveacrinids (Roveacrinida) are also documented and represented by isolated thecae, radials, basals, spines, and brachials. Numerous remains of roveacrinids are visible in thin sections; these will be published elsewhere. Additionally, a critical systematic review of the crinoids mentioned and illustrated in the literature is also provided. The millericrinid remains from the Campanian of Alabama, southeastern USA, were used for comparative purposes and represent the youngest occurrence of the order Millericrinida in the world thus far. The abundance of crinoid genera between the northern and southern Tethys parts is shown to be significant. However, the number of crinoids in Africa, the Middle East, and India remains underestimated. Possible reasons for this underestimation are provided.

Published
2024
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28. Deepwater Sediment Facies and Sole Marks of the Numidian Flysch, Algeria

Author

Menzoul, Bouabdellah, Stow, Dorrik, Adaci, Mohammed, Benhamou, Miloud, Mahdjoub Araibi, Hicham, Bensalah, Mustapha, Benyoucef, Madani, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Amer, Mourad, Series Editor, Boughdiri, Mabrouk, editor, Bádenas, Beatriz, editor, Selden, Paul, editor, Jaillard, Etienne, editor, Bengtson, Peter, editor, and Granier, Bruno R.C., editor

Published
2019
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29. New Biostratigraphic Scheme from the Cenomanian-Turonian of South Algeria

Author

Benyoucef, Madani, Zaoui, Djamila, Adaci, Mohammed, Guendouz, Mohamed Lassad, Mennad, Abdelkader, Bensalah, Mustapha, Pisello, Anna Laura, Editorial Board Member, Hawkes, Dean, Editorial Board Member, Bougdah, Hocine, Editorial Board Member, Rosso, Federica, Editorial Board Member, Abdalla, Hassan, Editorial Board Member, Boemi, Sofia-Natalia, Editorial Board Member, Mohareb, Nabil, Editorial Board Member, Mesbah Elkaffas, Saleh, Editorial Board Member, Bozonnet, Emmanuel, Editorial Board Member, Pignatta, Gloria, Editorial Board Member, Mahgoub, Yasser, Editorial Board Member, De Bonis, Luciano, Editorial Board Member, Kostopoulou, Stella, Editorial Board Member, Pradhan, Biswajeet, Editorial Board Member, Abdul Mannan, Md., Editorial Board Member, Alalouch, Chaham, Editorial Board Member, O. Gawad, Iman, Editorial Board Member, Amer, Mourad, Series Editor, Boughdiri, Mabrouk, editor, Bádenas, Beatriz, editor, Selden, Paul, editor, Jaillard, Etienne, editor, Bengtson, Peter, editor, and Granier, Bruno R.C., editor

Published
2019
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45. Unlocking the secrets of the Early Jurassic of North Africa: first record of pseudoplanktonic crinoid <italic>Seirocrinus</italic> (Crinoidea, Pentacrinidae) from Morocco and Algeria.

Author

Salamon, Mariusz A., Benyoucef, Madani, Benzaggah, Mohamed, Brachaniec, Tomasz, Hoşgör, İ̇zzet, Jain, Sreepat, Płachno, Bartosz J., and Rahmonov, Oimahmad

Abstract

The Pliensbachian (Lower Jurassic) age-based Lower Marly Limestone Formation of the Moulay Idriss Zerhoun area (Morocco) and the Ain Ouarka Formation of the Ksour Mountains (Algeria) have yielded rare crinoids. Although crinoids have previously been described from the Jurassic of Algeria, their Pliensbachian occurrence is being reported here for the first time. On the other hand, one isocrinid taxa [Terocrinus subsulcatus (Münster in Goldfuss)] was also recorded from the Pliensbachian strata of Morocco. Additionally, now, from both Morocco and Algeria, Seirocrinus subangularis (Miller), belonging to the family Pentacrinitidae, is documented. This is a cosmopolitan and pseudoplaktonic crinoid species that is well-known from Asia, Europe, and North America. The taxonomic evaluation of the genus Seirocrinus is provided. The present records from Algeria and Morocco are the first finds of Seirocrinus from the African continent. Ticinocrinus moroccoensis sp. nov. represented by a cup of a rare cyrtocrinid (Cyrtocrinida) is associated with S. subangularis from Morocco. Globally, this is the second record of the genus; the first Ticinocrinus being described from the Pliensbachian of Switzerland. Thus, the present records from Morocco and Algeria are also the oldest cyrtocrinids from the southern margin of the Tethys. [ABSTRACT FROM AUTHOR]

Published
2023
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