belemnoid

简明释义

英[ˈbeləmˌnɔɪd]美[beləmˈnɔɪd]

adj. 形像匕首的；匕状的，刺状的

英英释义

单词用法

同义词

反义词

例句

1.The effective adopting stamping process on piston pin product quality and belemnoid demension is explained;

通过冲连皮工艺试验及批量生产，证明采用冲连皮工艺能够应用于活塞销加工过程；

2.Objective: to study the styloid of temporal bone and their relation with the surrounding structures, providing anatomic data for clinical diagnosis and treatment of belemnoid syndrome.

目的：研究颞骨茎突及其周围结构毗邻关系，为临床诊断和治疗茎突综合征提供解剖学数据。

3.Objective: to study the styloid of temporal bone and their relation with the surrounding structures, providing anatomic data for clinical diagnosis and treatment of belemnoid syndrome.

目的：研究颞骨茎突及其周围结构毗邻关系，为临床诊断和治疗茎突综合征提供解剖学数据。

4.Conclusion: the excessive length and improper inclination of the temporal styloid process are closely related with belemnoid syndrome.

结论：茎突综合征的发病与茎突过长和方位不正有着密切的联系。

5.Researchers discovered a new species of belemnoid 贝壳头类 in the sedimentary layers of the ancient ocean floor.

研究人员在古代海底的沉积层中发现了一种新的贝壳头类物种。

6.The belemnoid 贝壳头类 fossils provide insight into the marine ecosystems of prehistoric times.

贝壳头类化石为史前时期的海洋生态系统提供了见解。

7.The unique morphology of the belemnoid 贝壳头类 shells allows scientists to classify them into different genera.

贝壳头类壳体的独特形态使科学家能够将其分类到不同的属中。

8.Paleontologists often study belemnoid 贝壳头类 remains to understand the evolutionary history of cephalopods.

古生物学家经常研究贝壳头类遗骸，以了解头足类的进化历史。

9.The fossil record shows that the belemnoid 贝壳头类 cephalopods were abundant during the Late Jurassic period.

化石记录显示，贝壳头类头足类动物在晚侏罗纪时期非常丰富。

作文

The term belemnoid refers to a group of extinct marine cephalopods that are often recognized by their elongated, bullet-shaped shells. These fascinating creatures lived during the Mesozoic era, particularly from the late Triassic to the end of the Cretaceous period. The study of belemnoid fossils provides valuable insights into the evolution of cephalopods and the marine ecosystems of ancient oceans. Understanding these organisms can help paleontologists reconstruct past environments and the biodiversity that thrived in them.One of the most interesting aspects of belemnoid anatomy is their unique shell structure. Unlike modern squids and octopuses, which have soft bodies with little to no hard parts, belemnoids possessed an internal shell called a phragmocone, which was divided into chambers. This structure allowed them to regulate buoyancy, similar to how modern nautiluses operate. The external part of the shell was often smooth and streamlined, aiding in their ability to swim efficiently through the water. The ecological role of belemnoids in their environments was significant. They were likely agile predators, feeding on smaller fish and invertebrates. Their rapid swimming capabilities, combined with their beak-like jaws, made them formidable hunters in the marine food web. Additionally, they served as prey for larger marine reptiles and other predators of the time, demonstrating their importance in the trophic dynamics of Mesozoic seas.Fossils of belemnoids are commonly found in sedimentary rock formations around the world, providing a wealth of information about their morphology and distribution. Paleontologists study these fossils not only to understand the biology of these ancient creatures but also to gain insights into the environmental conditions of their time. For instance, the presence of belemnoid fossils in a specific geological layer can indicate the type of marine environment that existed millions of years ago, such as shallow seas or deep oceanic waters.Moreover, the extinction of belemnoids at the end of the Cretaceous period coincided with the mass extinction event that wiped out the dinosaurs. This event reshaped marine ecosystems and led to the decline of many marine species, including belemnoids. Understanding the factors that contributed to their extinction can provide valuable lessons about resilience and vulnerability in marine ecosystems, particularly in the face of climate change and habitat destruction today.In conclusion, the study of belemnoid cephalopods offers a fascinating glimpse into the past, revealing the complexity and diversity of ancient marine life. By examining their fossils, scientists can piece together the evolutionary history of cephalopods and the ecological dynamics of prehistoric oceans. As we continue to explore and learn about these remarkable creatures, we gain not only knowledge of our planet's history but also insights that may inform our understanding of current marine biodiversity and conservation efforts. The legacy of belemnoids serves as a reminder of the ever-changing nature of life on Earth and the importance of preserving our natural world for future generations.

术语belemnoid指的是一组已灭绝的海洋头足类动物，通常以其细长的子弹形外壳而闻名。这些迷人的生物生活在中生代，特别是从晚三叠世到白垩纪末期。对belemnoid化石的研究为头足类动物的进化和古代海洋生态系统提供了宝贵的见解。理解这些生物可以帮助古生物学家重建过去的环境以及在其中繁盛的生物多样性。belemnoid解剖学中最有趣的方面之一是它们独特的壳结构。与现代的鱿鱼和章鱼不同，后者的身体柔软且几乎没有硬部件，belemnoids则拥有一种称为隔室壳的内部壳，这种壳被分为多个腔室。这种结构使它们能够调节浮力，类似于现代鹦鹉螺的运作方式。壳的外部通常光滑而流线型，有助于它们高效地在水中游动。belemnoids在其环境中的生态角色非常重要。它们可能是灵活的捕食者，以较小的鱼类和无脊椎动物为食。它们快速的游泳能力，加上喙状的下颚，使它们成为海洋食物网中强大的猎手。此外，它们也是当时较大海洋爬行动物和其他捕食者的猎物，展示了它们在中生代海洋营养动态中的重要性。belemnoids的化石通常在世界各地的沉积岩层中发现，为我们提供了关于它们形态和分布的大量信息。古生物学家研究这些化石，不仅是为了理解这些古老生物的生物学，还为了获得关于它们时代环境条件的见解。例如，某一特定地质层中belemnoid化石的存在可以指示数百万年前存在的海洋环境类型，如浅海或深海水域。此外，belemnoids在白垩纪末期的灭绝与消灭恐龙的那场大规模灭绝事件相吻合。这一事件重塑了海洋生态系统，并导致许多海洋物种的衰退，包括belemnoids。理解导致它们灭绝的因素可以为我们提供有关海洋生态系统在气候变化和栖息地破坏面前的韧性和脆弱性的宝贵教训。总之，研究belemnoid头足类动物为我们提供了对过去的迷人洞察，揭示了古代海洋生命的复杂性和多样性。通过检查它们的化石，科学家们可以拼凑出头足类动物的进化历史和史前海洋的生态动态。随着我们继续探索和了解这些非凡的生物，我们不仅获得了对地球历史的知识，还获得了对当前海洋生物多样性和保护努力的理解。belemnoids的遗产提醒我们，地球生命的本质是不断变化的，以及保护我们自然世界的重要性，以便为未来的世代留下遗产。