cnidarians

简明释义

英[nɪˈdeəriənz]美[naɪˈdɛriənz]

刺细胞动物

英英释义

单词用法

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例句

1.A new phylogenetic analysis suggests that this rare early Cambrian anthozoan be among the primitive crown cnidarians.

新的谱系分析显示，它应该代表刺胞动物门中的一个原始类群。

2.Others, though, believe they were Cnidarians, the group that includes modern sea anemones and jellyfish.

而有的则认为它们是刺胞动物，这是包括现代的海葵和海蜇在内的一门动物。

3.A new phylogenetic analysis suggests that this rare early Cambrian anthozoan be among the primitive crown cnidarians.

新的谱系分析显示，它应该代表刺胞动物门中的一个原始类群。

4.Coral reefs are primarily formed by cnidarians 刺胞动物 such as corals that provide habitats for many marine species.

珊瑚礁主要由cnidarians 刺胞动物如珊瑚形成，为许多海洋物种提供栖息地。

5.Many cnidarians 刺胞动物, like jellyfish, have stinging cells that can be harmful to humans.

许多cnidarians 刺胞动物，如水母，具有对人类有害的刺细胞。

6.In the ocean, cnidarians 刺胞动物 play a crucial role in the food chain.

在海洋中，cnidarians 刺胞动物在食物链中扮演着至关重要的角色。

7.The study of cnidarians 刺胞动物 in marine biology reveals their complex life cycles.

海洋生物学中对cnidarians 刺胞动物的研究揭示了它们复杂的生命周期。

8.Researchers are investigating how climate change affects cnidarians 刺胞动物 and their ecosystems.

研究人员正在调查气候变化如何影响cnidarians 刺胞动物及其生态系统。

作文

Cnidarians, or 刺细胞动物, are a diverse group of aquatic animals that include jellyfish, corals, and sea anemones. They are characterized by their unique body structure and specialized cells called cnidocytes, which contain stinging organelles known as nematocysts. These fascinating creatures play a crucial role in marine ecosystems and demonstrate a wide range of forms and behaviors. The body structure of cnidarians is mainly composed of two layers: the outer epidermis and the inner gastrodermis, with a jelly-like substance called mesoglea in between. This simple body plan allows them to thrive in various aquatic environments, from shallow reefs to deep ocean waters. One of the most intriguing aspects of cnidarians is their radial symmetry, which means their body parts are arranged around a central axis. This symmetry is particularly advantageous for capturing prey and interacting with their environment. Cnidarians exhibit two primary body forms: the polyp and the medusa. Polyps are typically sessile, meaning they remain attached to a substrate, while medusae are free-swimming and often resemble traditional jellyfish. Both forms have their own unique adaptations that help them survive and reproduce in their respective habitats. For example, polyps often form colonies, such as coral reefs, which provide essential habitats for countless marine species. One of the key features of cnidarians is their ability to capture prey using their stinging cells. When a potential prey item comes into contact with the tentacles of a cnidarian, the nematocysts fire, injecting toxins that immobilize the prey. This adaptation not only aids in feeding but also serves as a defense mechanism against predators. The ecological significance of cnidarians cannot be overstated; they are vital components of marine food webs, serving as both predators and prey. Moreover, cnidarians are also important for their contributions to biodiversity and habitat formation. Coral reefs, built by colonial polyps, are among the most diverse ecosystems on the planet. They provide shelter and breeding grounds for numerous fish species and other marine organisms. However, these ecosystems are currently threatened by climate change, pollution, and overfishing, leading to significant declines in cnidarians populations and the health of coral reefs. Research on cnidarians has also revealed insights into evolutionary biology. As one of the oldest animal groups, they offer clues about the early development of multicellular organisms. Their simple body plan and regenerative abilities make them ideal subjects for scientific studies, particularly in understanding cellular processes and regeneration. In conclusion, cnidarians are remarkable creatures that contribute significantly to the complexity and diversity of marine ecosystems. Their unique adaptations, ecological roles, and evolutionary importance make them a fascinating subject of study. Protecting cnidarians and their habitats is essential for maintaining the health of our oceans and the myriad of life forms they support.

刺细胞动物（cnidarians）是一类多样化的水生动物，包括水母、珊瑚和海葵。它们的特征是独特的身体结构和称为刺细胞的特化细胞，这些细胞内含有称为刺丝囊的刺伤器官。这些迷人的生物在海洋生态系统中发挥着至关重要的作用，并展示出广泛的形态和行为。刺细胞动物的身体结构主要由两层组成：外部表皮和内部消化腺，之间有一种称为胶质层的胶状物质。这个简单的身体计划使它们能够在各种水生环境中繁衍生息，从浅水礁到深海水域。刺细胞动物最引人入胜的方面之一是它们的辐射对称性，这意味着它们的身体部分围绕中心轴排列。这种对称性对于捕捉猎物和与环境互动特别有利。刺细胞动物表现出两种主要的身体形态：水螅型和水母型。水螅型通常是定栖的，意味着它们固定在基底上，而水母型则是自由游动的，通常看起来像传统的水母。这两种形态都有各自独特的适应性，帮助它们在各自的栖息地中生存和繁殖。例如，水螅型通常形成群落，如珊瑚礁，为无数海洋物种提供必要的栖息地。刺细胞动物的一个关键特征是它们能够利用刺细胞捕捉猎物。当潜在猎物与刺细胞动物的触手接触时，刺丝囊会发射，注入毒素，使猎物失去行动能力。这种适应性不仅有助于进食，还作为防御机制抵御捕食者。刺细胞动物的生态重要性不容小觑；它们是海洋食物链的重要组成部分，既是捕食者也是猎物。此外，刺细胞动物在生物多样性和栖息地形成方面也很重要。由群体水螅形成的珊瑚礁是地球上最丰富的生态系统之一。它们为无数鱼类和其他海洋生物提供庇护和繁殖场所。然而，这些生态系统目前正受到气候变化、污染和过度捕捞的威胁，导致刺细胞动物种群和珊瑚礁健康的显著下降。对刺细胞动物的研究还揭示了关于进化生物学的见解。作为最古老的动物群体之一，它们为理解多细胞生物的早期发展提供了线索。它们简单的身体结构和再生能力使它们成为科学研究的理想对象，特别是在理解细胞过程和再生方面。总之，刺细胞动物是令人惊叹的生物，对海洋生态系统的复杂性和多样性作出了重要贡献。它们独特的适应性、生态角色和进化重要性使它们成为一个迷人的研究对象。保护刺细胞动物及其栖息地对于维护我们海洋的健康及其支持的无数生命形式至关重要。