相关实验视频

Updated: May 25, 2025

Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras
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Assessing Species-specific Contributions To Craniofacial Development Using Quail-duck Chimeras

Published on: May 31, 2014

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巴西的三叠纪龙前体:目录,进化背景和Pterosauromorpha的家族遗传关系的新假设

Maurício S Garcia1,2, Rodrigo T Müller1,2

  • 1Universidade Federal de Santa Maria, Centro de Apoio à Pesquisa da Quarta Colônia, Rua Maximiliano Vizzotto, 598, 97230-000 São João do Polêsine, RS, Brazil.

Anais da Academia Brasileira de Ciencias
|February 26, 2025
PubMed
概括

这项研究确定了巴西的三叠纪前体,揭示了 lagerpetids 作为早期的 pterosauromorphs. 这有助于我们更好地了解龙的起源,它们是第一个飞行脊椎动物.

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相关概念视频

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The 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...
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Phylogenetic trees come in many forms. It matters in which sequence the organisms are arranged from the bottom to the top of the tree, but the branches can rotate at their nodes without altering the information. The lines connecting individual nodes can be straight, angled, or even curved.
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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.
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The diverse plant life on Earth—consisting of nearly 400,000 species—can be divided into three broad categories based on biological characteristics: nonvascular, seedless vascular, and seed plants.
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