Turonian-Santonian echinoids from Wadi Qena,Eastern Desert,Egypt; a new arrangement of apical disc plating in spatangoids |
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| Institution: | 1. Geology Department, Faculty of Science, Minia University, 61519 Egypt;2. Geology Department, Faculty of Science, Assiut University, Egypt;3. Geology Department, Faculty of Science, Al-Azhar University, Assiut Branch, Egypt;1. Institut für Geowissenschaften, Ruprecht-Karls-Universität, Im Neuenheimer Feld 234, 69120, Heidelberg, Germany;2. Museo de Paleontología, Adolfo E. Romo 1701, La Cascada, 26343, Santa Rosa de Múzquiz, Coah, Mexico;1. RNS Institute of Technology, Bangalore, India;2. The National institute of Technology, Mysore, India;1. National Institute of Oceanography and Fisheries, Fish Research Station, El-Kanater El-Khairia, Cairo, Egypt;2. Department of Biology, Faculty of Science, Al-Jouf University, Sakaka, Al-Jouf, Saudi Arabia |
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| Abstract: | Eighteen echinoid species (seven regular and eleven irregular) belonging to twelve genera have been described from the Turonian-Santonian succession of two sections located in the northern part of Wadi Qena, Eastern Desert. The diversity of the recorded species is low in the Turonian (six species), but comparatively high in the Coniacian-Santonian (twelve species). Of the recorded species, Most of these species (72%) are recorded for the first time from Wadi Qena area, one left in open nomenclature, Mecaster sp., represents a new species, and two, Phymosoma microtuberculatum and Thylechinus (T.) said, represent new records for Egypt. The taxonomic rank of Parapygus sudrensis has been changed. Phymosoma microtuberculatum which is known from the ‘Senonian’ of southwest Europe is recorded herein in the lower Turonian. Two echinoid assemblage zones are recognizable in each of the studied two sections. They are correlated with other fossil assemblage zones in Egypt. Faunal affinity and paleobiogeography of the species are discussed. A new arrangement of apical disc plating in spatangoids is described and discussed. |
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| Keywords: | Turonian-Santonian Echinoids Apical disc plating Spatangoids Egypt |
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