cephalochordate

简明释义

英[ˌsefələʊˈkɔːdeɪt]美[ˈsefəloˈkɔrˌdet]

n. 头索动物；头索动物纲动物

adj. 头索动物的；头索动物纲的

英英释义

单词用法

同义词

反义词

例句

1.In evolution, Amphioxus, a cephalochordate, has been regarded as the living fossil closest to the vertebrates.

在进化中，头索动物文昌鱼被认为是接近于脊椎动物的活化石。

2.Amphioxus, a cephalochordate, is an important model for studies of evolution and comparative biology.

文昌鱼是研究进化和比较生物学的重要模式生物。

3.In evolution, Amphioxus, a cephalochordate, has been regarded as the living fossil closest to the vertebrates.

在进化中，头索动物文昌鱼被认为是接近于脊椎动物的活化石。

4.The cephalochordate 头索动物 is often used as a model organism in developmental biology.

cephalochordate 头索动物 通常被用作发育生物学中的模型生物。

5.The study of cephalochordate 头索动物 anatomy provides insights into the evolution of vertebrates.

对cephalochordate 头索动物 解剖学的研究为脊椎动物的进化提供了见解。

6.Understanding the feeding mechanisms of cephalochordate 头索动物 can help us learn more about filter feeding.

了解cephalochordate 头索动物 的进食机制可以帮助我们更多地了解滤食。

7.Researchers are investigating the role of cephalochordate 头索动物 in marine ecosystems.

研究人员正在调查cephalochordate 头索动物 在海洋生态系统中的作用。

8.The fossil record of cephalochordate 头索动物 offers clues about early chordate evolution.

cephalochordate 头索动物 的化石记录提供了关于早期脊索动物进化的线索。

作文

The animal kingdom is incredibly diverse, with various phyla exhibiting unique characteristics and adaptations. One fascinating group within this kingdom is the cephalochordates, organisms that have intrigued biologists for many years. The term cephalochordate refers to a subphylum of chordates, which includes lancelets or amphioxus. These small, fish-like creatures are primarily found in shallow marine environments and play a significant role in understanding the evolutionary history of vertebrates.Cephalochordates possess a notochord, a flexible rod-like structure that provides support, which is a defining feature of all chordates. This characteristic is crucial as it represents an evolutionary step towards the development of more complex vertebrates. Interestingly, the notochord in cephalochordates extends into the head region, which is where the name originates—'cephalo' meaning head and 'chordate' referring to the notochord. This anatomical feature distinguishes them from other chordates and highlights their primitive nature.Another remarkable aspect of cephalochordates is their simple body plan. Unlike vertebrates, they lack a true backbone and have a more straightforward organization. Their bodies are elongated and laterally compressed, allowing them to burrow into sandy substrates. They also possess gill slits, which are essential for filter feeding. As water passes through these slits, cephalochordates can capture tiny food particles, showcasing a fascinating adaptation to their environment.The study of cephalochordates is vital for several reasons. Firstly, they serve as a model organism for understanding the evolution of vertebrates. By examining their genetic makeup and developmental processes, scientists can gain insights into how complex features evolved over millions of years. Additionally, cephalochordates share many similarities with early vertebrates, making them crucial for reconstructing the evolutionary tree of life.Furthermore, cephalochordates are also important in ecological studies. They contribute to the health of marine ecosystems by playing a role in nutrient cycling and serving as prey for various marine species. Their presence indicates a healthy environment, as they are sensitive to changes in water quality and habitat degradation. Thus, monitoring cephalochordate populations can provide valuable information about the overall health of marine ecosystems.In conclusion, cephalochordates are a unique group of organisms that offer significant insights into the evolution and ecology of chordates. Their distinct features, such as the notochord and simple body plan, make them an essential subject of study in biology. As researchers continue to explore the complexities of life on Earth, cephalochordates will undoubtedly remain a focal point in understanding our own origins and the intricate web of life that surrounds us.

动物王国是非常多样化的，不同的门类展现出独特的特征和适应性。其中一个引人入胜的群体就是头索动物，这些生物多年来一直吸引着生物学家的兴趣。术语头索动物指的是脊索动物的一个亚门，包括文昌鱼或半索。它们是小型类鱼生物，主要生活在浅海环境中，在理解脊椎动物的进化历史方面发挥着重要作用。头索动物具有脊索，这是一种提供支持的柔韧杆状结构，这是所有脊索动物的定义特征。这个特征至关重要，因为它代表了向更复杂的脊椎动物发展的一个进化步骤。有趣的是，头索动物的脊索延伸到头部区域，这就是名称的来源——“cephalo”意为头，“chordate”指的是脊索。这个解剖特征使它们与其他脊索动物区分开来，并突显了它们的原始特性。头索动物的另一个显著特点是它们简单的身体结构。与脊椎动物不同，它们没有真正的脊柱，身体组织更为简单。它们的身体呈细长且侧扁的形状，使它们能够在沙质底层中掘洞。它们还具有鳃裂，这对滤食至关重要。当水流过这些鳃裂时，头索动物可以捕捉微小的食物颗粒，展示了它们对环境的迷人适应。对头索动物的研究至关重要，原因有几个。首先，它们是理解脊椎动物进化的模型生物。通过研究它们的遗传构成和发育过程，科学家可以深入了解复杂特征如何在数百万年中进化。此外，头索动物与早期脊椎动物有许多相似之处，使它们在重建生命的进化树方面至关重要。此外，头索动物在生态研究中也很重要。它们通过参与养分循环并作为各种海洋物种的猎物，对海洋生态系统的健康做出贡献。它们的存在表明环境健康，因为它们对水质变化和栖息地退化非常敏感。因此，监测头索动物种群可以提供有关海洋生态系统整体健康的宝贵信息。总之，头索动物是一类独特的生物，提供了对脊索动物进化和生态的重要见解。它们的独特特征，如脊索和简单的身体结构，使它们成为生物学研究的重要对象。随着研究人员继续探索地球生命的复杂性，头索动物无疑将继续成为理解我们自身起源和周围错综复杂的生命网络的焦点。