Video Experimental Relacionado
Updated: Jun 29, 2026
10:28
Kinematics and Ground Reaction Force Determination: A Demonstration Quantifying Locomotor Abilities of Young Adult, Middle-aged, and Geriatric Rats
Published on: February 23, 2011
Reptil bípedo reptil del período Pérmico temprano.
D S Berman1, R R Reisz, D Scott
1Section of Vertebrate Paleontology, Carnegie Museum of Natural History, 4400 Forbes Avenue, Pittsburgh, PA 15213, USA.
Science (New York, N.Y.)
|November 4, 2000
Resumen
Un reptil fósil de 290 millones de años de antigüedad, Eudibamus cursoris, de Alemania muestra una temprana locomoción bípeda cursorial. Este descubrimiento revela la distribución más antigua conocida de Parareptilia y bolosauridos en Laurasia.
Área de la Ciencia:
- Paleontología Paleontología.
- Paleontología de los vertebrados.
- Biología evolutiva Biología evolutiva.
Sus antecedentes:
- La evolución temprana de los reptiles y su locomoción es crucial para comprender la diversificación de los amniotas.
- Los Bolosauridae representan un grupo temprano de reptiles con una distribución y un papel ecológico poco comprendidos.
Objetivo del estudio:
- Para describir un nuevo reptil fósil, Eudibamus cursoris, del Pérmico Inferior de Alemania.
- Para investigar las capacidades locomotoras y la posición filogenética de E. cursoris.
- Proporcionar información sobre la evolución temprana y la distribución de Parareptilia y Bolosauridae.
Principales métodos:
- Análisis morfológico detallado de un esqueleto de reptil bien conservado.
- Estudios anatómicos comparativos con otros reptiles primitivos.
- Análisis filogenético para determinar la posición de E. cursoris dentro de Amniota.
Principales resultados:
- El esqueleto de 290 millones de años de antigüedad representa a Eudibamus cursoris, gen. et sp. Nov., un pequeño bolosáurido.
- E. cursoris exhibe adaptaciones para la locomoción bípeda cursorial, incluida una postura digitigrade parasagital.
- Este hallazgo confirma la presencia de Bolosauridae en Laurasia durante el Permiano Temprano.
- E. cursoris se identifica como el miembro más antiguo conocido de Parareptilia.
Conclusiones:
- Eudibamus cursoris proporciona la evidencia más antigua del bípedismo cursorial en los reptiles.
- El descubrimiento amplía el rango geográfico conocido de Bolosauridae en el Permiano Temprano.
- E. cursoris representa el Parareptilia más antiguo conocido, arrojando luz sobre la diversificación de este clado reptiliano principal.
Videos de Conceptos Relacionados
01:56Gastrulation
Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...
01:06Fixed Action Patterns
A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
02:22The Colonization of Land
Changes in the environment of the early Earth drove the evolution of organisms. As prokaryotic organisms in the oceans began to photosynthesize, they produced oxygen. Eventually, oxygen saturated the oceans and entered the air, resulting in an increase in atmospheric oxygen concentration, known as the oxygen revolution approximately 2.3 billion years ago. Therefore, organisms that could use oxygen for cellular respiration had an advantage. More than 1.5 years ago, eukaryotic cells and...
02:35What is Evolutionary History?
Scientists record evolutionary history by analyzing fossil, morphological, and genetic data. The fossil record documents the history of life on Earth and provides evidence for evolution. However, both fossil and living organisms offer evidence that outlines Earth’s evolutionary history.Phylogenetic trees illustrate the evolutionary relationships among these organisms. Scientists infer organisms’ common ancestry by evaluating shared morphological and genetic characteristics. Together, the fossil...
02:56The Fossil Record
The fossil record documents only a small fraction of all organisms that have ever inhabited Earth. Fossilization is a rare process, and most organisms never become fossils. Moreover, the fossil record only exhibits fossils that have been discovered. Nevertheless, sedimentary rock fossils of long-lived, abundant, hard-bodied organisms dominate the fossil record. These fossils offer valuable information, such as an organism's physical form, behavior, and age. Studying the fossil record helps...
01:54Convergent Evolution
Evolution shapes the features of organisms over time, ensuring that they are suited for the environments in which they live. Sometimes, selection pressure leads to the rise of similar but unrelated adaptations in organisms with no recent common ancestors, a process known as convergent evolution.The structures that arise from convergent evolution are called analogous structures. They are similar in function even if they are dissimilar in structure. Further, structures can be analogous while also...