朱拉纪的头虫揭示了棘头虫的起源
Cihang Luo1,2,3, Luke A Parry4, Brendon E Boudinot3
1State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China.
Nature
|April 9, 2025
概括
一个新的化石,Juracanthocephalus daohugouensis,揭示了棘头虫 (Acanthocephala) 从自由生活的虫进化. 这一发现揭示了这个神秘的寄生虫群体的起源.
科学领域:
- 古生物学与进化生物学
- 动物学和寄生虫学
背景情况:
- 头虫 (Acanthocephala) 是具有独特的嘴的内寄生虫,以前没有重要的化石证据证明它们的早期进化.
- 分子系学表明,Acanthocephala起源于自由生活的虫 (Gnathifera),可能属于Rotifera,但化石数据很少.
研究的目的:
- 描述一个新型的头体化石,Juracanthocephalus daohugouensis,来自中罗纪的头生物群.
- 通过古生物学证据调查头动物的进化起源和早期多样性.
主要方法:
- 一个化石的acanthocephalan标本的描述和分析,Juracanthocephalus daohugouensis gen. et. 这样就好了. 没有.
- 与现存的阿坎托塞法拉 (Acanthocephala) 和相关种类 (例如,Gnathifera,Rotifera) 的比较形态分析.
主要成果:
- 化石Juracanthocephalus表现出关键的acanthocephalan特征,包括一个的鼻和毛囊,以及Gnathifera的部.
- 朱拉坎托塞法卢斯表现出与罗蒂费拉 (特别是西森代) 和阿坎托塞法拉 (Acanthocephala) 联系的特征,这表明它是一种过渡形式.
- 这一发现揭示了古代阿坎托塞法拉的生态和形态多样性.
结论:
- 甲 (Juracanthocephalus daohugouensis) 是一个关键的过渡化石,弥合了自由生活的甲和寄生虫甲之间的进化差距.
- 这一发现为古生物学家们提供了关于神秘的甲虫群的起源和早期演变的重要洞察力.
相关概念视频
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
Retroviruses
12.1K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
12.1K
Non-vascular Seedless Plants
63.0K
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.
63.0K
What is Evolutionary History?
36.0K
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.
36.0K
Phylogenetic Trees
44.9K
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.
44.9K
The Fossil Record
24.8K
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...
24.8K


