Video Experimental Relacionado
Updated: Jul 16, 2026
10:55
Ablation of a Single Cell From Eight-cell Embryos of the Amphipod Crustacean Parhyale hawaiensis
Published on: March 16, 2014
Vendobiontes del Cámbrico Inferior de China y evolución temprana de diploblastos
D-G Shu1, S Conway Morris, J Han
1Early Life Institute and Key Laboratory of Continental Dynamics, Northwest University, Xi'an 710069, China. elidgshu@nwu.edu.cn
Science (New York, N.Y.)
|May 6, 2006
Resumen
Un fósil recién descubierto del Bajo Cámbrico, Stromatoveris, se asemeja a los vendobiontes de Ediacaran y puede representar un ancestro temprano de ctenóforos. Este hallazgo ofrece información sobre la evolución temprana de los metazoos y los orígenes de las medusas de peine.
Área de la Ciencia:
- Paleontología Paleontología.
- Biología evolutiva Biología evolutiva.
- Filogenia de los primeros metazoos.
Sus antecedentes:
- La biota de Ediacaran precedió a la explosión cámbrica, influyendo en la radiación metazoaria.
- Las relaciones evolutivas de los organismos ediacaranos siguen siendo difíciles de integrar con la filogenia metazoaria temprana.
Objetivo del estudio:
- Para describir un nuevo fósil, Stromatoveris psygmoglena sp. para describir un nuevo fósil, Stromatoveris psygmoglena sp. Nov., del bajo cámbrico Chengjiang Lagerstätte.
- Investigar las implicaciones filogenéticas de Stromatoveris, en particular su relación potencial con los vendobiontes ediacaranos y los primeros ctenóforos.
Principales métodos:
- Análisis morfológico detallado del fósil Stromatoveris psygmoglena.
- Análisis comparativo con los vendobiontes ediacaranos y los primeros fósiles de metazoos.
- Interpretación filogenética basada en características anatómicas, incluidos los potenciales precursores de la fila del peine.
Principales resultados:
- Stromatoveris exhibe una morfología frondosa sorprendentemente similar a la de los vendobiontes ediacaranos.
- La exquisita preservación revela ramas estrechamente espaciadas, posiblemente ciliadas.
- Estas ramas sugieren precursores de las filas de peine de diagnóstico de los ctenóforos.
Conclusiones:
- Stromatoveris proporciona un vínculo potencial entre la fauna Ediacaran y el Cámbrico.
- El fósil tiene implicaciones significativas para la comprensión de la evolución temprana de los ctenóforos.
- Sugiere que algunos diploblastos desarrollaron de forma independiente un hábito de frondosa durante la diversificación temprana de los metazoos.
Más Videos Relacionados
12:15The C. elegans Intestine As a Model for Intercellular Lumen Morphogenesis and In Vivo Polarized Membrane Biogenesis at the Single-cell Level: Labeling by Antibody Staining, RNAi Loss-of-function Analysis and Imaging
Published on: October 3, 2017
12:09Protocol for Human Blastoids Modeling Blastocyst Development and Implantation
Published on: August 10, 2022
Videos de Conceptos Relacionados
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...
01:24Eukaryotic Evolution
The endosymbiont theory is the most widely accepted theory of eukaryotic evolution; however, its progression is still somewhat debated. According to the nucleus-first hypothesis, the ancestral prokaryote first evolved a membrane to enclose DNA and form the nucleus. Conversely, the mitochondria-first hypothesis suggests that the nucleus was formed after endosymbiosis of mitochondria.
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
Contrary to the endosymbiont theory, the eukaryote-first hypothesis proposes that the simpler prokaryotic and...
01:13Cell Diversity
The concept of a cell started with microscopic observations of dead cork tissue by Robert Hooke in 1665. Hooke coined the term "cell" based on the resemblance of the small subdivisions in the cork to the rooms that monks inhabited, called cells. About ten years later, Antonie van Leeuwenhoek became the first person to observe the living and moving cells under a microscope. In the century that followed, the theory that cells represented the basic unit of life developed.
Multicellular organisms...
Multicellular organisms...
01:21Three-Domain System of Life
Ribosomal RNA (rRNA) sequence analysis revealed three distinct groups of cells: eukaryotes, bacteria, and archaea. In 1978, Carl R. Woese proposed the concept of domains, a taxonomic level above kingdoms, to differentiate these groups. He suggested that archaea and bacteria, despite their similar appearance, represent separate domains. Domains differ in rRNA, membrane lipid structure, transfer RNA, and antibiotic sensitivity.In this classification, animals, plants, and fungi belong to the...
01:27Diversity of Protists II
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
01:27Diversity of Protists III
Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...