甲 - 旧世泛三甲贝的古史学
Nathan Ong1, Eric Snively1, Holly N Woodward1
1Department of Anatomy and Cell Biology, Oklahoma State University Center for Health Sciences, Tulsa, Oklahoma, USA.
Journal of anatomy
|May 9, 2025
概括
乌在纪古时期的灭绝事件中幸存下来,外的变化很小. 一些物种适应了血管化的外以呼吸,但这种特征变得不适应,导致灭绝.
科学领域:
- 古生物学的古生物学
- 脊椎动物解剖学 脊椎动物解剖学
- 灭绝事件 灭绝事件
背景情况:
- 纪古 (K/Pg) 灭绝事件造成了广泛的生命损失,但海表现出了显著的解剖稳定性.
- 了解跨越这个边界的贝组织学变异对于评估乌的弹性和适应是至关重要的.
研究的目的:
- 分析K/Pg灭绝前后的三甲 (软贝) 贝组织学.
- 为了研究像度,分层学和分类学这样的因素如何影响贝组织学和K/Pg生存率.
主要方法:
- 收集和分析了超过25,000个三虫贝组织学的半定量和定量测量.
- 将组织学数据与环境和进化变量进行统计比较.
主要成果:
- 的特征,如合板结构和边缘,在K/Pg边界上几乎没有变化.
- 北方丹尼亚海的外被选定为具有生物机械抗性.
- 特定的属 (Helopanoplia,Gilmoremys) 拥有高度血管化的外,可能有助于皮肤呼吸,但是少数灭绝的三族动物之一.
结论:
- 虽然大多数海以稳定的外解剖学幸存下来K/Pg事件,但一些血统的专门适应证明是有害的.
- 灭绝后的古世乌表现出更多的外改造,表明生态系统的恢复和选择性压力的转变.
相关概念视频
The Fossil Record
24.7K
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...
24.7K
What is Evolutionary History?
35.9K
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.
35.9K
Phylogenetic Trees
44.8K
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.
44.8K
Phylogeny
43.4K
Phylogeny is concerned with the evolutionary diversification of organisms or groups of organisms. A group of organisms with a name is called a taxon (singular). Taxa (plural) can span different levels of the evolutionary hierarchy. For instance, the group containing all birds is a taxon (comprising the class Aves), and the group of all species of daisies (the genus Bellis) is a taxon. Phylogenies can likewise include just one genus (i.e., depict species relationships) or span an entire kingdom.
43.4K
The Tree of Life - Bacteria, Archaea, Eukaryotes
31.7K
The “tree of life” describes the evolution of life and the evolutionary relationships between organisms. The root of the tree is the common ancestor to all life on Earth. All other species radiate from this point, much like the branches of a tree. The numerous tips of these branches on the tree of life represent every living, or extant, species. Extinct species, which are species that no longer exist, can be found towards the center of the tree. Currently, these organisms, both...
31.7K
Convergent Evolution
27.2K
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.
27.2K


