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。
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.
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.
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.
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.
- They possess a notochord, a dorsal nerve cord, pharyngeal slits, an endostyle, and a post-anal tail during some period of their lifetime.
- They are highly evolved animals that belong to Kingdom Animalia.
- Moreover, they are deuterostomes.
What is the Difference Between Vertebrates and Chordates?
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.