The Late Cambrian acritarch Cristallinium randomense: morphology,taxonomy and stratigraphical extension |
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| Affiliation: | 1. IANIGLA, CCT CONICET Mendoza, A. Ruiz Leal s/n, Parque General San Martín, M5502IRA Mendoza, Argentina;2. CONICET — Departamento de Geología y Petróleo, Facultad de Ingeniería, Universidad Nacional del Comahue, Buenos Aires 1400, Q8300IBX Neuquén, Argentina;3. Ichron Limited, Century House, Gadbrook Business Centre, Northwich CW9 7TL, UK;4. CICTERRA-CONICET, Laboratorio de Análisis de Cuencas — Universidad Nacional de Córdoba, Av. Vélez Sársfield 1611, X5016 GSA, Córdoba, Argentina;1. Department of Geology, Faculty of Earth Sciences, Kharazmi University, 49 Mofatteh Avenue, 15614 Tehran, Iran;2. Univ. Lille, CNRS, UMR 8198 - Evo-Eco-Paleo, F–59000 Lille, France;3. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, East Beijing Road 39, 210008 Nanjing, China;1. IANIGLA, CCT CONICET Mendoza, Av. Ruiz Leal s/n, Parque General San Martín, Mendoza M5502IRA, Argentina;2. CONICET — INGEOSUR (Instituto Geológico del Sur), Universidad Nacional del Sur, Departamento de Geología, San Juan 670, Bahía Blanca 8000, Argentina;1. UMR 8198 Evo-Eco-Paleo, CNRS, Université de Lille—Sciences et Technologies, Bâtiment SN5, Cité Scientifique, Avenue Paul Langevin, 59655 Villeneuve d''Ascq Cedex, France;2. Naturmuseum Südtirol, Bindergasse 1, 39100 Bolzano-Bozen, Italy;3. ENS-UMR 5276, CNRS, Université Lyon 1, Campus de la Doua, 2, rue Raphaël Dubois, 69622 Villeurbanne Cedex, France;4. Faculté Pluridisciplinaire de Nador, Labo OLMAN-RL, FPN 300, Selouane, 67200, Nador, Morocco;5. Geology Department, Pomona College, 185 E. Sixth Street, Claremont, CA 91711, USA;6. Department of Geology, Ghent University, Krijgslaan 281/S8, 9000 Ghent, Belgium |
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| Abstract: | The holotype of Cristallinium randomense Martin and other figured specimens are re-examined. The processes are often grouped as those of typical Vulcanisphaera species. Probable connections between Cristallinium and Vulcanisphaera are indicated. These genera form a plexus in which Retisphaeridium is also possibly involved. A complete bibliographical list of C. randomense is provided. Few published specimens are demonstrated to belong to this species. As a consequence, some stratigraphical dates, based on the restricted Late Cambrian range of the species, are questioned. The new combination Retisphaeridium ovillense (Cramer and Diez de Cramer) Vanguestaine nov. comb. is proposed. |
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