Abstract Faunipollenites Bharadwaj is considered a junior synonym of Protohaploxypinus Samoilovich emend. Morbey. However, Indian workers claim it is a valid genus due to a poorly defined corpus and absence of folds in distal attachment. In India, a standard method is applied including the oxidization with HNO3 more than 48 hours (+10’ of KOH). We analyze the effects of that treatment on the morphology of pollen grains of both genera in samples from the Permian of India and Brazil. The same samples are also processed with HCl, HF, two hours of HNO3 and 2’ of KOH and slides are mounted after each step. Our analysis reveals that distinct or indistinct central body and presence/absence of folds in distal attachment do not change in contrast to the indistinct central body and mostly absence of folds from samples that underwent a longer period of oxidization (24-48 hours and KOH 10’). The synonymization of Faunipollenites to Protohaploxypinus is confirmed. Species of Faunipollenites are reassigned to the revised species of Protohaploxypinus. The usage of the latter genus and its species in Permian biostratigraphic studies of India will improve Gondwanan correlations and paleobiogeographic reconstructions in future studies.

Abstract: The morphology and structure of megaspores assigned to Lagenoisporites magnus from the Toregua Formation, Retama Group, mid-upper Tournaisian of Bolivia were studied. The analysis was performed with light, fluorescence and scanning electron microscopy. Megaspores were laterally compressed and presented a spherical body with a proximal gula, of the hologula type. Gula had verrucae ornamentation and the spore body presented complex processes consisting of a bulbous base and an internally partitioned projection with sharp apex. In addition to this main ornamentation, perforations were present throughout the spore surface. Megaspores showed well marked curvaturae perfectae due to the abrupt transition existing between the gula ornamentation and the spore body processes. These megaspores were assigned to heterosporous arborescent lycopsids of the Lepidocarpaceae family, as in section view, exospore structure presented a three-dimensional network of fused elements. Likewise, due to a similarity found between sporoderm and Isoetes L. structure, it is evident that megaspores structure has remained intact inside the heterosporous lycopsids. Therefore; the L. magnus structure not only would confirm its affinity with the Lycophyta fossils but also with the living ones.

The knowledge of palynomorphs, inclu-ding acritarchs, chitinozoan, prasinophytes, cryptospores, trilete spores and associated forms within the Paleozoic of the Zenta Range (Eastern Range of Argentina) display a significant increase in recent years. This increment in the studies comprises temporal distribution, composition of assemblages, relationships with other fossil groups as well as the intrinsic characteristics of the micro foras. The current study updates the knowledge on the palyno-morphs spanning the Early Ordovician (Early Tremadocian) to the Late Carboniferous (Middle Pennsylvanian) of different sections of the Zenta Range, regarding biostratigraphic, paleogeographic and paleoecological considerations.

El conocimiento de los palinomorfos, incluyendo acritarcos, quitinozoos, algas prasinofíceas, criptosporas, esporas triletes y otros, del Paleozoico de la Sierra de Zenta (Cordillera Oriental Argentina) ha tenido un importante incremento en los últimos años. Este crecimiento en los estudios se refere tanto a su distribución temporal, composición de las asociaciones, relaciones con otros grupos fósiles, así como las características intrínsecas de las microforas. En este caso, el lapso de tiempo de distribución de los palinomorfos analizados abarca desde el Ordovícico temprano (Tremadociano temprano) hasta el Carbonífero tardío (Pennsylvaniano medio). El presente artículo reúne el conocimiento actual de las microforas identificadas en estratos ordovícicos, silúricos, devónicos y carboníferos de diferentes secciones de la Sierra de Zenta, con consideraciones bioestratigráficas, paleogeográficas y paleoecológicas.

Two associations of palynomorphs recovered from eight samples from Los Monos Formation (late Eifelian-early Frasnian), cropping out at Balapuca, located at the Bolivian margin of the Bermejo River in the San Telmo range, are characterized. In the Tarija Basin, this unit overlies the Pescado (or Huamampampa) Formation (Emsian-Eifelian) and underlies the Iquiri Formation (Frasnian-Famennian), when it is preserved. The studied section is mainly composed of grey laminated or massive pelites and sandstones with current structures or bioturbation. Paleoinvertebrates and fossil plant debris were recovered from different levels, and some of them yielded palynomorphs. The whole microflora here presented is composed of 76 species, of which trilete spores are dominant and acritarchs, prasinophytes, cryptospores and chitinozoans are subordinately present. Two new species of spores, Leiotriletes balapucensis and Endoculeospora altobellii, both belonging to the youngest assemblage, are described. Two assemblages are recognized based on the stratigraphical distribution of diagnostic species, one attributed to the late Eifelian and the other to the late early Givetian to late Givetian. Both associations share several species with other coeval microfloras mainly from Argentina, Bolivia, Brazil, and beyond South America, from North America and western Europe

Se caracterizan cuali-cuantitativamente dos asociaciones palinológicas recuperadas de ocho muestras fértiles de la Formación Los Monos (Eifeliano tardío-Frasniano temprano), expuesta en la localidad de Balapuca, ubicada en la margen boliviana del río Bermejo en la sierra de San Telmo. Esta unidad depositada en la Cuenca Tarija, sobreyace a la Formación Pescado (o Huamampampa, Emsiano-Eifeliano), y subyace, cuando está preservada, a la Formación Iquirí (Frasniano-Famenniano). La sección litológica estudiada se compone principalmente de pelitas grises, laminadas o macizas, y areniscas con estructuras de corriente o bioturbadas. Restos de invertebrados y plantas fósiles fueron recuperados de distintos niveles, algunos de los cuales resultaron además, palinológicamente fértiles. La microflora en su totalidad aquí presentada se compone de 76 especies de palinomorfos, entre las cuales son dominantes las esporas trilete mientras que aparecen subordinados acritarcas, prasinofitas, criptosporas y quitinozoarios. Se describen dos especies nuevas de esporas, Leiotriletes balapucensis y Endoculeospora altobellii, ambas comprendidas en la asociación más jóven. La distribución estratigráfica de especies clave permitió reconocer dos asociaciones, una atribuida al Eifeliano tardío y la otra al Givetiano temprano tardío a Givetiano tardío. Ambas asociaciones comparten numerosas especies con otras microfloras coetáneas principalmente de Argentina, Bolivia, Brasil y fuera de América del Sur, en América del Norte y el oeste de Europa