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espanolEl presente estudio reporta por primera vez la taxonomia de radiolarios pertenecientes a sedimentos marinos de edad Mioceno-Reciente de Costa Rica. La identificacion taxonomica se realizo utilizando los sedimentos obtenidos en las perforaciones U1381C y U1414 A de la Expedicion CRISP A2 del Programa Integral de Perforacion Oceanica, (IODP, por sus siglas en ingles). Ambos sitios estan ubicados en mar abierto cercanos a la Peninsula de Osa, Pacifico este ecuatorial. Dichos sedimentos consisten en un ooze calcareo con nanofosiles, foraminiferos, diatomeas, espiculas de esponja y radiolarios. En ambas secuencias, la recuperacion de radiolarios varia desde ausentes a abundantes y bien preservados. El siguiente estudio presenta la sistematica paleontologica a detalle junto con las ilustraciones de radiolarios. Una publicacion previa asociada a este estudio proporciona los datos estadisticos y bioestratigraficos de los sitios, los cuales corresponden al Mioceno medio-Reciente (zonacion RN5 a RN16). El numero total de especies identificadas en las muestras es de 116, distribuidas en 14 familias y 41 generos. La perforacion U1414 A suma un total de 105 especies y 65 taxones con identificaciones condicionales (grupos), y la perforacion U1381C un total de 90 especies y 55 grupos. EnglishRadiolarians from Miocene–Recent marine sediments are taxonomically reported for the first time in Costa Rica using samples from Sites U1381C and U1414A of the Integrated Ocean Drilling Program CRISP A2 expedition. Both sites are presently located offshore Osa Peninsula, northeastern equatorial Pacific. The sediments retrieved from the two sites mainly consist of nannofossil calcareous ooze with foraminifera, sponge spicules, diatoms and radiolarians. In both sequences, radiolarians vary from absent to abundant and well preserved. This work presents the systematic paleontology of the radiolarians recorded including taxonomic notes and illustrations of the species. An associated publication provides the statistic and biostratigraphic data for the sites, spanning from the middle Miocene to the Recent (radiolarian zones RN5 to RN16). In total, 116 species (14 families and 41 genera) were found. Hole U1414A yielded a total of 105 species and 65 taxa with conditional identifications (“species groups”), and Hole U1381C yielded a total of 90 species and 55 species groups.

Miocene to Recent Radiolarians from Southern Pacific Coast of Costa Rica