Laboratorio Of Sistematica Y Biologia Evolutiva

Santiago del Estero, Argentina

Laboratorio Of Sistematica Y Biologia Evolutiva

Santiago del Estero, Argentina
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Telleria M.C.,Laboratorio Of Sistematica Y Biologia Evolutiva | Telleria M.C.,CONICET | Palazzesi L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Palazzesi L.,CONICET | And 2 more authors.
Review of Palaeobotany and Palynology | Year: 2015

Barnadesioideae (94 species) is the sister subfamily to the rest of the Asteraceae (23,000 species). Pollen grains in this subfamily are structurally and sculpturally distinctive and diverse. Although pollen morphology has contributed to the taxonomy of the subfamily, there is a gap of knowledge concerning the evolution of the exine structure. This study aims at exploring the systematic and phylogenetic significance of optimizing selected pollen characters of Barnadesioideae on the latest molecular phylogenetic tree. Transmission electron microscope (TEM) observations on pollen of selected species, some of them never explored so far, show that the exine probably evolved from a thin pattern (ca. 1-3 μm), with a well-developed foot layer and solid and free columellae, present in sister family Calyceraceae, towards a thicker (>. 6-11. μm) and a more complex columellate-granulate bilayered exine in Barnadesioideae (with very delicate columellae). The particular exine structure observed in the monotypic Schlechtendalia luzulaefolia, which combines compact and independent columellae (common in more derived Asteraceae) with a granular internal tectum as the inner ectexine layer (as in Barnadesioideae), reinforces its distant phylogenetic position within Barnadesioideae. More derived lineages within Asteraceae (e.g. Mutisioideae) retained some ancestral exine features although evolved an even thicker exine and a columellate trilayered exine (with robust columellae), rare in the angiosperm pollen grains. © 2015 Elsevier B.V.


Telleria M.C.,Laboratorio Of Sistematica Y Biologia Evolutiva | Barreda V.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Palazzesi L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Katinas L.,Museo de La Plata
Plant Systematics and Evolution | Year: 2010

The Late Oligocene Mutisiapollis telleriae, which is the oldest echinate fossil pollen of Asteraceae from Patagonia, was tentatively related to the subfamily Mutisioideae. A detailed comparison of M. telleriae with extant asteraceous pollen indicates strong similarities with both Mutisioideae (in particular the Gongylolepis type) and Carduoideae (some genera of Carduinae) subfamilies. This morphotype, as an example of the exceptional diversity of fossil pollen of Asteraceae found in Patagonia, contributes to the knowledge of the early history of the family. © Springer-Verlag 2010.


Barreda V.D.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Palazzesi L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Palazzesi L.,Jodrell Laboratory | Telleria M.C.,Laboratorio Of Sistematica Y Biologia Evolutiva | And 3 more authors.
Proceedings of the National Academy of Sciences of the United States of America | Year: 2015

The Asteraceae (sunflowers and daisies) are the most diverse family of flowering plants. Despite their prominent role in extant terrestrial ecosystems, the early evolutionary history of this family remains poorly understood. Here we report the discovery of a number of fossil pollen grains preserved in dinosaur-bearing deposits from the Late Cretaceous of Antarctica that drastically pushes back the timing of assumed origin of the family. Reliably dated to ∼76-66 Mya, these specimens are about 20 million years older than previously known records for the Asteraceae. Using a phylogenetic approach, we interpreted these fossil specimens as members of an extinct early diverging clade of the family, associated with subfamily Barnadesioideae. Based on a molecular phylogenetic tree calibrated using fossils, including the ones reported here, we estimated that the most recent common ancestor of the family lived at least 80 Mya in Gondwana, well before the thermal and biogeographical isolation of Antarctica. Most of the early diverging lineages of the family originated in a narrow time interval after the K/P boundary, 60-50 Mya, coinciding with a pronounced climatic warming during the Late Paleocene and Early Eocene, and the scene of a dramatic rise in flowering plant diversity. Our age estimates reduce earlier discrepancies between the age of the fossil record and previous molecular estimates for the origin of the family, bearing important implications in the evolution of flowering plants in general. © 2015, National Academy of Sciences. All rights reserved.


Barreda V.D.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Barreda V.D.,CONICET | Palazzesi L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Palazzesi L.,CONICET | And 14 more authors.
Annals of Botany | Year: 2012

Background and Aims: Morphological, molecular and biogeographical information bearing on early evolution of the sunflower alliance of families suggests that the clade containing the extant daisy family (Asteraceae) differentiated in South America during the Eocene, although palaeontological studies on this continent failed to reveal conclusive support for this hypothesis. Here we describe in detail Raiguenrayun cura gen. & sp. nov., an exceptionally well preserved capitulescence of Asteraceae recovered from Eocene deposits of northwestern Patagonia, Argentina. •Methods: The fossil was collected from the 47·5 million-year-old Huitrera Formation at the Estancia Don Hiplito locality, Ro Negro Province, Argentina.•Key Results: The arrangement of the capitula in a cymose capitulescence, the many-flowered capitula with multiseriateimbricate involucral bracts and the pappus-like structures indicate a close morphological relationship with Asteraceae. Raiguenrayun cura and the associated pollen Mutisiapollis telleriae do not match exactly any living member of the family, and clearly represent extinct taxa. They share a mosaic of morphological features today recognized in taxa phylogenetically close to the root of Asteraceae, such as Stifftieae, Wunderlichioideae and Gochnatieae (Mutisioideae sensu lato) and Dicomeae and Oldenburgieae (Carduoideae), today endemic to or mainly distributed in South America and Africa, respectively.•Conclusions: This is the first fossil genus of Asteraceae based on an outstandingly preserved capitulescence that might represent the ancestor of MutisioideaeCarduoideae. It might have evolved in southern South America some time during the early Palaeogene and subsequently entered Africa, before the biogeographical isolation of these continents became much more pronounced. The new fossil represents the first reliable point for calibration, favouring an earlier date to the split between Barnadesioideae and the rest of Asteraceae than previously thought, which can be traced back at least 47·5 million years. This is the oldest well dated member of Asteraceae and perhaps the earliest indirect evidence for bird pollination in the family. © The Author 2011.


Barreda V.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Barreda V.,CONICET | Palazzesi L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Palazzesi L.,CONICET | And 7 more authors.
Review of Palaeobotany and Palynology | Year: 2010

Much of our knowledge of the past distribution and radiation of Asteraceae and allied families depends on the fossil pollen record. In recent years, new discoveries are coming to light from southern Africa, Australia, New Zealand, and southern South America (Patagonia). Unequivocally assigned morphotaxa from accurately dated sediments have permitted for the first time a comprehensive review of the past distribution of the most important core of the sunflower alliance of families (Menyanthaceae, Goodeniaceae, Calyceraceae and Asteraceae). The main goal of this contribution is to explore the major evolutionary radiation of the basal lineages of Asteraceae (Mutisioideae and Barnadesioideae) and allied relatives (Menyanthaceae, Goodeniaceae and Calyceraceae) on the basis of the worldwide fossil pollen records. Several taxa, which today are restricted to isolated geographic regions, were widespread in the Southern Hemisphere during Paleogene times. Menyanthaceae, Goodeniaceae and Mutisioideae (Asteraceae), for example, had a wide distribution over Gondwanan landmasses in the Oligocene and are now drastically reduced in their geographic range. Early Neogene records, in contrast, suggest extinction and diversification events that progressively led to the present day configuration. In broad terms, the distribution of Miocene fossils assigned to this clade (Barnadesioideae, Nassauvieae, and Calyceraceae) agrees with that of their present distribution. The major floristic turnovers coincided with the final isolation of Antarctica, leading to cooler, drier, and more seasonal climates and forced the evolution and distribution of these Gondwanan elements. © 2010 Elsevier B.V. All rights reserved.


Telleria M.C.,Laboratorio Of Sistematica Y Biologia Evolutiva | Sancho G.,Museo de La Plata | Funk V.A.,Smithsonian Institution | Ventosa I.,Institute Ecologia y Sistematica | Roque N.,Federal University of Bahia
Plant Systematics and Evolution | Year: 2013

In the context of recent molecular phylogenies of the basal grades of Compositae, we investigated the utility of pollen morphology within the tribe Gochnatieae. The pollen of 64 species of Anastraphia,Cnicothamnus, Cyclolepis, Gochnatia, Pentaphorus, and Richterago was studied using light microscopy and scanning electron microscopy. In addition, three extra-Gochnatieae genera (Ianthopappus, Leucomeris, and Nouelia) were examined as they were traditionally morphologically related to members of the tribe Gochnatieae. Three of the species of Gochnatieae were examined using transmission electron microscopy. Two pollen types, and two new subtypes, have been recognized on the basis of the pollen shape, size, and exine sculpture. The pollen features of Gochnatia sect. Moquiniastrum and G. cordata are similar and distinctive within the genus and support the recently re-circumscribed section Hedraiophyllum. Within the species with echinate pollen surface, the distinctive spine length of Anastraphia supports its recent resurrection as a genus. The identity of Pentaphorus could not be supported by pollen features as was for other morphological characteristics. The pollen features shared across Cyclolepis,Ianthopappus, Leucomeris, Nouelia and Gochnatia sect. Moquiniastrum, as well as those shared by Richterago and Anastraphia could be a result of parallel evolution. © 2013 Springer-Verlag Wien.


Palazzesi L.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Barreda V.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Telleria M.C.,Laboratorio Of Sistematica Y Biologia Evolutiva | Telleria M.C.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia
Review of Palaeobotany and Palynology | Year: 2010

A new fossil pollen species (Psilatricolporites protrudens sp. nov) is described from Miocene sedimentary sections of the Chenque and Puerto Madryn formations (Chubut province, Argentina). The fossil pollen grains are characterized by being small, tricolporate, subspheroidal to suboblate in shape; rhombic outline in equatorial view and subtriangular in polar view. The exine is tectate and columellate; the nexine is thickened toward endoapertures resulting in a typical wall protrusion on the external surface. These morphological features point to a possible relationship with Gamocarpha type of the Calyceraceae. Most species of this type grow in high-altitude arid habitats or in coastal locations under extreme climatic condition. The gradual spread of the stress-adapted Calyceraceae as well as other phylogenetically related taxa (e.g. Barnadesioideae, Mutisioideae) during the Miocene in southern South America may have been triggered by the increasing aridity and seasonality caused by Andean uplift. This fossil record represents the first finding of Calyceraceae, the most closely related family of Asteraceae, and provides evidence for the timing of their geographic radiation. © 2009 Elsevier B.V. All rights reserved.


PubMed | Museo Argentino de Ciencias Naturales Bernardino Rivadavia, CONICET, Institute of Geological & Nuclear Sciences, Laboratorio Of Sistematica Y Biologia Evolutiva and Jodrell Laboratory
Type: Journal Article | Journal: Proceedings of the National Academy of Sciences of the United States of America | Year: 2015

The Asteraceae (sunflowers and daisies) are the most diverse family of flowering plants. Despite their prominent role in extant terrestrial ecosystems, the early evolutionary history of this family remains poorly understood. Here we report the discovery of a number of fossil pollen grains preserved in dinosaur-bearing deposits from the Late Cretaceous of Antarctica that drastically pushes back the timing of assumed origin of the family. Reliably dated to 76-66 Mya, these specimens are about 20 million years older than previously known records for the Asteraceae. Using a phylogenetic approach, we interpreted these fossil specimens as members of an extinct early diverging clade of the family, associated with subfamily Barnadesioideae. Based on a molecular phylogenetic tree calibrated using fossils, including the ones reported here, we estimated that the most recent common ancestor of the family lived at least 80 Mya in Gondwana, well before the thermal and biogeographical isolation of Antarctica. Most of the early diverging lineages of the family originated in a narrow time interval after the K/P boundary, 60-50 Mya, coinciding with a pronounced climatic warming during the Late Paleocene and Early Eocene, and the scene of a dramatic rise in flowering plant diversity. Our age estimates reduce earlier discrepancies between the age of the fossil record and previous molecular estimates for the origin of the family, bearing important implications in the evolution of flowering plants in general.

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