Results 1 to 10 of about 94,560 (188)

FÓSILES: HISTORIA DE LA VIDA EN LA TIERRA

Epistemus, 2021
Por medio de los fósiles es posible conocer la historia de la vida en el pasado geológico del planeta Tierra.  Es probable que la vida se originó a inicios del Precámbrico, hace más de 3800 millones de años, sin embargo, los restos fósiles más antiguos ...
Francisco Javier Cuen Romero, Elizabeth Chacón-Baca, J. Moreno-Bedmar, María Patricia Velasco-de León   +3 more
semanticscholar   +3 more sources

Una “araña pirata” (Araneae: Mimetidae) en el ámbar del Mioceno Temprano y actualización del listado de arañas fósiles para Chiapas, México

Acta Biológica Colombiana, 2020
En busca de contribuir al conocimiento de la araneofauna fosil en Chiapas, Mexico, se describe y fotografia una “arana pirata” (Araneae: Mimetidae) descubierta en una pieza de ambar del municipio de Simojovel de Allende, con una edad de 23 millones de ...
Miguel Ángel García-Villafuerte
semanticscholar   +3 more sources

Functional Morphology of the Scaphoid in Extant African Apes, Humans and Fossil Hominins. [PDF]

Am J Biol Anthropol
ABSTRACT Objectives The morphology of the hominoid scaphoid has played a key role in functional and evolutionary hypotheses related to the emergence of hominin bipedalism and tool use. However, the scaphoid's complex morphology is challenging to comparatively analyze via traditional 2D linear measurements.
Steer NG, Bardo A, Davies TW, Rosas A, Skinner MM, Kivell TL.   +5 more
europepmc   +2 more sources

An arbuscular mycorrhiza from the 407-million-year-old Windyfield Chert identified through advanced fluorescence and Raman imaging. [PDF]

New Phytol
Summary Mycorrhizal associations between fungi and plants are a fundamental aspect of terrestrial ecosystems. Mycorrhizas occur in c. 85% of extant plants, yet their geological record remains sparse. Rare fossil evidence from early terrestrial environments offers crucial insights into these ancient symbioses, but visualizing fossil fungi at the ...
Strullu-Derrien C, Wightman R, McDonnell LP, Evans G, Fercoq FA, Kenrick P, Ferrari AC, Schornack S.   +7 more
europepmc   +2 more sources

Nuevos registros fósiles de vertebrados terrestres para Las Llanadas, Sancti Spíritus, Cuba

Novitates Caribaea, 2017
The paleontological deposit Las Llanadas is a spring rich in organic matter. At the beginning of the 20th century, studies of the site reports fossil materials of sloths, crocodiles, tortoises, and hutias.
E. Aranda, Joao G. Martínez López, Osvaldo Jiménez, C. A. Luna, Lázaro William Viñola López   +4 more
semanticscholar   +3 more sources

Postcranial anomalies of Eocene freshwater pleurodiran and cryptodiran turtles from the Spanish Duero Basin. [PDF]

Anat Rec (Hoboken)
Abstract Testudines are one of the best‐represented taxonomic groups among the Paleogene taxa of the Duero Basin (Castile and Leon Autonomous Community, central Spain). Among them, Neochelys (Podocnemidide) and Allaeochelys (Carettochelyidae) are most abundant, allowing the population to be assessed for osteological anomalies.
Guerrero A, Ortega F, Martín de Jesús S, Pérez-García A.   +3 more
europepmc   +2 more sources

Morphology and paleoecology of a hybodontiform with serrated teeth, Priohybodus arambourgi, from the Late Jurassic of northeastern Brazil. [PDF]

Anat Rec (Hoboken)
Abstract Hybodontiformes was a diverse, successful, and important group of shark‐like chondrichthyans known from a variety of ecosystems. Some representatives of the order had a wide palaeogeographic distribution, as is the case with Priohybodus arambourgi. With a multicuspidate crown, P. arambourgi was the first hybodontiform to develop fully serrated
Eltink E, da Silva KR, de França MAG, de Morais DMF, Soto M, Duffin CJ.   +5 more
europepmc   +2 more sources

A new Crocodyloidea from the middle Eocene of Zamora (Duero Basin, Spain). [PDF]

Anat Rec (Hoboken)
Abstract The eusuchian crocodyliforms recorded in the Eocene levels of the Spanish Duero Basin belong to three lineages: Planocraniidae, with the species Duerosuchus piscator; Alligatoroidea, represented by several specimens of the genus Diplocynodon; and Crocodyloidea, which includes several specimens traditionally attributed to Asiatosuchus.
Narváez I, de Celis A, Escaso F, Martín de Jesús S, Pérez-García A, Ortega F.   +5 more
europepmc   +2 more sources

Shell characterization of the youngest valid species of the European Eocene genus Neochelys (Pleurodira, Podocnemididae): The Spanish Bartonian Neochelys salmanticensis. [PDF]

Anat Rec (Hoboken)
Abstract The freshwater pleurodiran turtle Neochelys is the best‐represented member of Podocnemididae in the European record, being known by eight Eocene species. The youngest of them is the Bartonian (middle Eocene) Neochelys salmanticensis, from the Duero Basin (Salamanca Province, Central Spain).
Pérez-García A, Guerrero A, Martín de Jesús S, Ortega F.   +3 more
europepmc   +2 more sources

Emisión de gases de efecto invernadero por uso de combustibles fósiles en Ibagué, Tolima (Colombia)

Ciencia y Tecnología Agropecuaria, 2016
Climate change is caused by the increase of concen-trations of greenhouse gases (ghg), especially CO2, caused by the proliferation of fossil fuels use. Forest systems can capture carbon in biomass and mitigate the climate change problem.
H. J. Andrade-Castañeda, Cristhian Camilo Arteaga-Céspedes, M. A. Segura-Madrigal   +2 more
semanticscholar   +3 more sources