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Abstract.  The Mesozoic Era is crucial for analyzing the replacement of microplanktonic lineages resulting from the beginning of the break-up of Pangea. The paleogeography of South America, and hence of Argentina, underwent successive changes since this time. The opening of different seaways, mainly during the Jurassic, affected the global circulation pattern of the oceans which determined the composition of the organic-walled marine microplankton associations of the Neuquen Basin. These Jurassic marine palynofloras are summarized here, based on the information from outcrop samples of 12 units, which were analyzed from a paleobiogeographic point of view. The configuration of the basin during the Early Jurassic was characterized mainly by partially interconnected depocenters, with restricted marine circulation that favored the development of associations dominated by components of the green lineage (acritarchs and prasinophytes). The Cuyo and Lotena groups (Middle Jurassic) were accumulated during two important flooding episodes which generated the paleoecological conditions for an increase in the diversity of the red lineage (dinocysts). Since the late Callovian the Hispanic Corridor connected the Neuquen Basin with the Tethyan realm allowing the free interchange of species. The Late Jurassic marine palynofloras are best characterized in the Vaca Muerta and Picun Leufu formations. The anoxic condition that prevailed during the accumulation of the Vaca Muerta Formation marked the return to the dominance of the green lineage. Conversely, the Picun Leufu Formation represents neritic more oxygenated bottom waters that favored a relative increase in the abundance and diversity of dinoflagellate cysts. KEY WORDS. Jurassic. Marine palynofloras. Paleobiogeography. Neuquen Basin. Argentina. Resumen. MICROPLANCTON MARINO DE PARED ORGANICA, JURASICO DE LA CUENCA NEUQUINA. DISTRIBUCION, BIOESTRATIGRAFIA Y PALEOBIOGEOGRAFIA. UNA REVISION. El Mesozoico constituye un momento crucial para analizar el recambio de los distintos linajes microplanctonicos producto del inicio de la ruptura de Pangea. La paleogeografia de Sudamerica y por lo tanto la de Argentina, experimento sucesivos cambios durante este lapso de tiempo. La apertura de diferentes corredores oceanicos, principalmente durante el Jurasico, afecto los patrones de circulacion global de los oceanos, evidenciado en la Cuenca Neuquina en la variabilidad de composicion de las asociaciones microplanctonicas de pared organica. Se reune la informacion proveniente de muestras de afloramiento de 12 unidades jurasicas, cuyas palinofloras marinas fueron analizadas desde un punto de vista paleobiogeografico. La configuracion de la cuenca durante el Jurasico Temprano se caracterizo principalmente por la presencia de una serie de depocentros parcialmente interconectados con circulacion marina restringida. Este contexto favorecio el desarrollo del linaje verde (acritarcos y prasinoficeas). Dos grandes episodios de inundacion marina provocaron la acumulacion de los grupos Cuyo y Lotena (Jurasico Medio) generando las condiciones paleoecologicas para un incremento en la diversidad del linaje rojo (dinoquistes). A partir del Caloviano tardio la apertura del Corredor Hispanico permitio la conexion de la Cuenca Neuquina con el Dominio Tethiano y con ello, el libre intercambio de especies. El Jurasico Tardio es aqui caracterizado por las palinofloras marinas de las formaciones Vaca Muerta y Picun Leufu. Las condiciones anoxicas que prevalecieron durante la acumulacion de la Formacion Vaca Muerta constituyen un retorno al predominio del linaje verde. Por el contrario, la Formacion Picun Leufu caracterizada por ambientes de plataforma con aguas relativamente mas oxigenadas, favorecieron el incremento en la abundancia y diversidad de dinoflagelados. PALABRAS CLAVE. Jurasico. Palinofloras marinas. Paleobiogeografia. Cuenca Neuquina. Argentina.

JURASSIC ORGANIC-WALLED MARINE MICROPLANKTON FROM THE NEUQUÉN BASIN. DISTRIBUTION, BIOSTRATIGRAPHY AND PALEOBIOGEOGRAPHY. A REVIEW