cynodonts

简明释义

英[ˈsɪnədɒnts]美[ˈsɪnəˌdɑnts]

n. 犬齿龙类

英英释义

单词用法

同义词

反义词

例句

1.The rest are cynodonts, cold-blooded, reptile-like animals he ancestors of modern mammals.

剩下的化石属犬齿兽——一种冷血、像爬行动物的动物，它们是现代哺乳动物的祖先。

2.The rest are cynodonts, cold-blooded, reptile-like animals he ancestors of modern mammals.

剩下的化石属犬齿兽——一种冷血、像爬行动物的动物，它们是现代哺乳动物的祖先。

3.Many characteristics of modern mammals can be traced back to their cynodont ancestors.

现代哺乳动物的许多特征可以追溯到它们的犬齿兽祖先。

4.Research on cynodonts helps scientists understand the transition from reptiles to mammals.

对犬齿兽的研究帮助科学家理解从爬行动物到哺乳动物的过渡。

5.The study of cynodonts has provided valuable insights into the evolution of mammals.

对犬齿兽的研究为哺乳动物的演化提供了宝贵的见解。

6.The features of cynodonts suggest they were warm-blooded.

犬齿兽的特征表明它们可能是温血动物。

7.Paleontologists have discovered fossils of cynodonts dating back to the Triassic period.

古生物学家发现了可追溯到三叠纪的犬齿兽化石。

作文

The history of life on Earth is a complex tapestry woven from countless species, each contributing to the evolutionary narrative. Among these fascinating groups are the cynodonts, a clade of therapsids that played a crucial role in the transition from reptiles to mammals. Understanding cynodonts is essential not only for paleontology but also for comprehending the origins of modern mammals. These creatures existed during the late Permian to the early Jurassic periods, showcasing a remarkable array of adaptations that foreshadowed mammalian characteristics.Cynodonts are often recognized for their advanced jaw structures, which allowed for a more efficient method of processing food compared to their ancestors. Their teeth were differentiated into incisors, canines, and molars, resembling the dental patterns seen in contemporary mammals. This specialization indicates a shift in diet and feeding strategies, suggesting that cynodonts may have been more active and agile than their predecessors.In addition to their dental innovations, cynodonts exhibited other mammalian traits, such as a more complex middle ear structure. This adaptation likely improved their hearing abilities, enabling them to detect sounds more effectively in their environment. Furthermore, some cynodonts displayed evidence of fur or hair, hinting at the development of insulation mechanisms that would become vital for warm-blooded animals.The evolutionary significance of cynodonts cannot be overstated. They represent a transitional phase that bridges the gap between reptiles and mammals, embodying key features that would later define the mammalian lineage. The study of cynodonts provides insights into how early mammals adapted to their environments, survived mass extinction events, and ultimately thrived in diverse ecological niches.Fossil evidence of cynodonts has been discovered across various continents, indicating their widespread distribution during the Mesozoic era. This geographical diversity suggests that they were highly adaptable, capable of surviving in different habitats ranging from arid regions to lush forests. As researchers continue to uncover new fossils, our understanding of cynodonts and their evolutionary journey becomes increasingly refined.Moreover, the extinction of many cynodonts at the end of the Triassic period paved the way for the rise of true mammals during the Jurassic. This extinction event was part of a larger pattern of environmental changes that reshaped ecosystems and allowed for new species to emerge. The resilience of cynodonts in the face of such challenges highlights the dynamic nature of evolution and the importance of adaptability in survival.In conclusion, cynodonts serve as a pivotal link in the evolutionary chain, illustrating the gradual transition from reptiles to mammals. Their unique adaptations, fossil records, and the role they played in shaping modern mammals make them a subject of great interest in paleontological studies. By exploring the world of cynodonts, we not only learn about the past but also gain a deeper appreciation for the intricate processes that have shaped life on Earth. The legacy of cynodonts continues to influence our understanding of biology and evolution, reminding us of the interconnectedness of all living organisms through time.

地球生命的历史是一幅复杂的挂毯，由无数物种编织而成，每个物种都为进化叙事做出了贡献。在这些迷人的群体中，有犬齿兽类，它们是一个重要的兽孔目，在爬行动物向哺乳动物过渡的过程中发挥了关键作用。理解犬齿兽类不仅对古生物学至关重要，也有助于理解现代哺乳动物的起源。这些生物存在于晚二叠世到早侏罗纪时期，展示了一系列显著的适应特征，预示着哺乳动物的特征。犬齿兽类通常因其先进的下颌结构而受到认可，这使得它们与祖先相比能够更有效地处理食物。它们的牙齿分化为切牙、犬牙和磨牙，类似于现代哺乳动物的牙齿模式。这种专业化表明饮食和捕食策略发生了变化，暗示犬齿兽类可能比其前辈更加活跃和灵活。除了牙齿的创新外，犬齿兽类还表现出其他哺乳动物特征，如更复杂的中耳结构。这种适应性可能提高了它们的听觉能力，使它们能够更有效地在环境中探测声音。此外，一些犬齿兽类显示出毛发或皮毛的证据，暗示着绝缘机制的发展，这对于温血动物来说将变得至关重要。犬齿兽类的进化意义不容小觑。它们代表了一个过渡阶段，弥合了爬行动物与哺乳动物之间的差距，体现了后来定义哺乳动物谱系的关键特征。对犬齿兽类的研究提供了关于早期哺乳动物如何适应环境、幸存于大规模灭绝事件并最终在多样化生态位中繁荣的见解。来自各大洲的犬齿兽类化石证据的发现表明，它们在中生代时期广泛分布。这种地理多样性表明它们具有高度的适应性，能够在从干旱地区到郁郁葱葱的森林等不同栖息地中生存。随着研究人员不断发现新的化石，我们对犬齿兽类及其进化旅程的理解变得越来越精细。此外，许多犬齿兽类在三叠纪末的灭绝为侏罗纪真正哺乳动物的崛起铺平了道路。这次灭绝事件是环境变化的更大模式的一部分，重塑了生态系统并使新物种得以出现。在面对这些挑战时，犬齿兽类的韧性突显了进化的动态特性以及适应性在生存中的重要性。总之，犬齿兽类作为进化链中的关键环节，展示了爬行动物向哺乳动物逐渐过渡的过程。它们独特的适应性、化石记录以及在塑造现代哺乳动物中所扮演的角色，使其成为古生物学研究中极具兴趣的话题。通过探索犬齿兽类的世界，我们不仅了解过去，还更加深刻地欣赏塑造地球生命的复杂过程。犬齿兽类的遗产继续影响我们对生物学和进化的理解，提醒我们所有生物在时间上的相互联系。