RESUMENSe describe un ejemplar de Macrocystella Callaway, 1877, procedente del Caradoc de El Viso del Marqués, provincia de Ciudad Real. El género Macrocystella es el único descrito para la familia Macrocystellidae y se trata de un taxón de especial interés al ser considerado uno de los Glyptocystitida más primitivos de los que derivarían los rombífe-ros con pectinirrombos. El género estaba hasta la fecha restringido al Ordovícico inferior y medio, resultando ser éste el primer hallazgo incuestionable de Macrocystella en materiales de edad Ordovícico superior; siendo, por otro lado, la primera especie que se describe para España, la cual proponemos denominar Macrocystella pauli.Palabras clave: Ordovícico, Caradoc, Sierra Morena, Macrocystella, Glyptocystitida, Rhombifera, Cistideo, Echinodermata. ABSTRACTA new species of Macrocystella Callaway, 1877, based on a specimen, from the Caradoc of El Viso del Marqués (Ciudad Real province, Spain) is described and named Macrocystella pauli. The family Macrocystellidae contains only the one genus Macrocystella which is considered to be the most primitive glyptocystitid from which later rhombiferans with pectinirhombs were derived. This paper presents the first record of Macrocystella from Spain and the first undoubted record from the Upper Ordovician.
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