Thekey differencebetween vertebrates and chordates is that脊椎动物是具有一个主要的弦的主要子晶片脊柱弦弦是具有高度进化的动物notochord, a背nerve cord,pharyngeal slits， 一个内接，和后期tailduring some period of their life span.
Vertebrates are a major group of chordates regarding the number of species, evolutionary sophistication, and many other aspects, as well. Moreover, many people believe that chordates are the same as vertebrates. However, chordates include two more subphyla other than the vertebrates. They are subphylumTunicata(orUrochordata)and subphylumCephalochordata。因此，并非所有弦弦都是脊椎动物，但所有脊椎动物都是弦弦。因此，本文试图详细介绍脊椎动物和弦弦之间的现有差异。
内容
1.Overview and Key Difference
2.什么是脊椎动物
3.什么是弦
4.脊椎动物和弦弦之间的相似之处
5。Side by Side Comparison – Vertebrates vs Chordates in Tabular Form
6。概括
什么是脊椎动物?
Vertebrate animals have their unique backbone with the spinal cord. Hence, their backbone is a column of vertebrae, which are parts of their internal skeleton. The skeleton could be either bony or cartilaginous. Among members of the chordates, they are the largest group including birds, mammals, fish, amphibians, and reptiles. Their spinal cord runs along the body between cranial and caudal regions through the hollow tube of the backbone.
同样，脊椎动物具有双侧对称体。脊椎动物的最重要特征是骨质结构覆盖的良好发达的大脑，称为头骨。他们的呼吸系统在动物与环境之间进行气体交换的肺部或ills的功能。有时，还有其他天然气交换的表面，例如口腔和皮肤很重要，尤其是在两栖动物中。
图01：脊椎动物
Moreover, the vertebrate digestive system is a complete one starting at the mouth and ends after rectum. This gastrointestinal tract lies ventrally to the spinal cord. Additionally, the mouth opens from the anterior, and the anus opens from the posterior end of the body. The circulatory system is a closed one with a ventrally located heart.
什么是弦？
和弦主要是具有一些非常独特的特征的动物，包括脊索，背神经绳，咽缝，内立与骨和肌肉尾巴。绝大多数弦琴具有由骨头或软骨组成的组织良好的内部骨架系统。但是，有一些变化，接受了总是有例外的规则。门：Chordata包括超过57,000种脊椎动物，3,000种贴仪性物种和少量柳叶刀的60,000多种物种。脊椎动物包括鱼类，两栖动物，爬行动物，鸟类和哺乳动物，而幼虫和sal中包含在上衣中。
However, all these animal groups possess the features mentioned above in the definition. The notochord is an internal structure that is very hard in nature, and it develops into the backbone or vertebral column of the vertebrates. The extension of the notochord makes the tail in chordates.
图02：弦
Moreover, the dorsal nerve chord is another unique feature of the chordates, and it is the spinal cord of vertebrates in popular tongue. Pharyngeal slits are a series of openings found immediately posterior to the mouth, and these may or may not last forever during the lifetime. That means these pharyngeal openings occur at least once in any vertebrate’s lifetime. The endostyle is an internal groove found in the ventral wall of the pharynx. The presence of these features characterizes any animal as a chordate.
和脊椎动物之间的相似之处是什么Chordates?
- 所有脊椎动物都是和弦。因此，它们具有类似的形态和解剖结构。
- They possess a notochord, a dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail during some period of their lifetime.
- 此外，脊椎动物和弦弦都包括鸟类，两栖动物，爬行动物，哺乳动物和鱼类。
- They are highly evolved animals that belong to Kingdom Animalia.
- Moreover, they are deuterostomes.
- 此外，它们具有双边对称体。
- 此外，这两种动物类型都是鞘翅目。
What is the Difference Between Vertebrates and Chordates?
脊椎动物是主要的弦。他们有一个骨干。另一方面，和弦是王国动物的高度进化的动物。他们有一条脊索，背神经，咽缝，一个内和静止的缝隙和一生的后尾巴。脊椎动物以外的弦弦不具有椎骨柱。这是脊椎动物和和弦之间的关键区别。
Moreover, a further difference between vertebrates and chordates is that the vertebrates include birds, reptiles, mammals, fish and amphibians. On the other hand, chordates include vertebrates, lancelets and tunicates. Other than that, vertebrates possess limbs, jaws, brain and skull that are not present in invertebrate chordates. So, this is also a difference between vertebrates and chordates.
摘要 - 脊椎动物与弦
Chordates belong to Kingdom Animalia. It is a big phylum that includes two invertebrate subphyla and one subphylum of vertebrates. Chordates have a notochord, a dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail during some period of their lifetime. On the other hand, vertebrates represent majority of the chordates. Vertebrates have a vertebral column. Furthermore, vertebrates have a brain and a skull. There are five main groups of vertebrates; birds, amphibians, reptiles, fish and mammals. This summarizes the difference between vertebrates and chordates.
Reference:
1.“ Chordate。”Wikipedia，Wikimedia基金会，2019年1月18日。Available here
2. Jollie，Malcolm T.“脊椎动物”。2017年11月22日，英国百科全书，英国百科全书。Available here
Image Courtesy:
1.“脊椎动物”，克里斯蒂安·詹斯基·伊斯汀克罗科迪尔（Christian Janskyleistenkrokodil(CC BY-SA 3.0)viaCommons Wikimedia
2.”Figure 29 01 04″ByCNX OpenStax（CC由4.0）viaCommons Wikimedia
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