No, the notochord and the nerve cord arise from different germ layers. The notochord is replaced by an ossified backbone, though there are still remnants between the vertebrae. The nerve cord, however, is protected by the ossified vertebral column.
any animal with a spine or similar. the simplest being known as a notochord. it can also be said that any animal descendant from Haikouichthys is a vertebrate.
The notochord is a flexible rod found in the embryos of all chordates, and is replaced later in life by the vertebral column and the main axial support of the body. If the animal you are referring to is an adult and lacking a "true notochord", it is still a chordate because the notochord has simply transformed into other parts of the body. However, if it is still an embryo and STILL has no notochord, it is not a true chordate.
Yes, Chordata is a phylum that includes animals with a notochord or spine at some stage of their development, such as vertebrates.
fish The vertebrates have a nebulous starting point. There are some chordates that have more of a notochord than a true vertebrate column. Some taxicologists are more comfortable saying that a Coelacanth has a notochord rather than a vertebrate column when clearly the vertebrate are present in this animal. So its is a matter of your own definition. One could say 'at a stretch' that the hagfish and lamprey are the most ancient vertebrates.
One feature not unique to vertebrates is the presence of a notochord, which is a flexible rod-like structure that provides support. While vertebrates have a more complex backbone and nervous system, notochords are also found in other animal groups, such as cephalochordates and some invertebrates, indicating a more primitive form of structural support. This evolutionary trait highlights the shared ancestry among different animal phyla.
Lanceletes are invertebrates, because they do not have any spine consisting of a chain of vertebra (vertebral column). They are however related to vartebrates being a mamber of the fylum (major animal group) chordates (chordata) of which also vertebrates (vertebrata) are a member. Instead of a vertebral column they have a rod at the same place made of robust connective tissue, a notochord. The spinal cord (nerve string) of this animal is not encased in this primitive spine, but lies posterior to it. This notochord later developed to a spine consisting of a chain of vertebra in the higher species. The early stages of the embryo of all vertebrates still have a notochord which during the fetal development gives rise to a real spinal column.
fish The vertebrates have a nebulous starting point. There are some chordates that have more of a notochord than a true vertebrate column. Some taxicologists are more comfortable saying that a Coelacanth has a notochord rather than a vertebrate column when clearly the vertebrate are present in this animal. So its is a matter of your own definition. One could say 'at a stretch' that the hagfish and lamprey are the most ancient vertebrates.
jaguars, belong to the class mammalia, i.e., they are mammals. All mammals are in turn necessarily vertebrates. This can be stated because jaguars, just like all other vertebrates, possess a vertebral column throughout life, which replaces the notochord which was present in their embryonic life.
A scientist classifies an animal as a vertebrate if it has a spinal cord, or notochord. Most vertebrates have a backbone, but the Phylum Cephalochordata do not have backbones but are still classified as vertebrates.
chordata are a phylum of animals that have in common. a chordate is a animal with a notochord.
chordata are a phylum of animals that have in common. a chordate is a animal with a notochord.
An animal that would be defined an invertebrate would be any animal lacking a backbone or a notochord.