Chordata is the third-largest phylum of the animal kingdom (behind only the protostomal phyla Arthropoda and Mollusca) and is also one of the most ancient taxons. Chordate fossils have been found from as early as the Cambrian explosion over 539 million years ago. [11] .

2025年2月12日 · Chordate, any member of the phylum Chordata, which includes the vertebrates, the most highly evolved animals, as well as two other subphyla—the tunicates and cephalochordates. Some classifications also include the phylum Hemichordata with the chordates.

2019年4月7日 · This flexible skeletal rod that’s made of cartilage is what gives chordates their name. The notochord runs between an animal’s digestive tube and its nerve cord and provides support for the body. It is the precursor of a backbone, or spine, in vertebrates.

2024年10月2日 · Chordates are subdivided into three main subphyla based on their morphological and developmental characteristics. The subphylum Vertebrata includes animals with a backbone, such as fish, amphibians, reptiles, birds, and mammals.

2024年11月23日 · It is located between the digestive tube and the nerve cord, providing skeletal support through the length of the body. In some chordates, the notochord acts as the primary axial support of the body throughout the animal’s lifetime.

Phylum Chordata possesses the following characteristic features: It is a longitudinal, cartilaginous rod running between the nerve cord and the digestive tract. It acts as a support for the nerve cord and is replaced by the vertebral column after the embryonic stage in all vertebrates.

2023年8月6日 · Chordates are defined as the organisms that usually possess a structure known as the notochord, at least during some part of their development into a mature organism. The phylum Chordata has three subphyla: Cephalochordate, Vertebrata, and Urochordata.

2024年7月31日 · What are chordates. Learn about the phylum Chordata with examples and their features, including symmetry, habitat, reproduction, evolution, and fossil records.

2019年2月19日 · Chordates (Chordata) are a group of animals that includes vertebrates, tunicates, lancelets. Of these, the vertebrates—lampreys, mammals, birds, amphibians, reptiles, and fishes—are the most familiar and are the group to which humans belong.

2024年9月22日 · Chordates are an incredibly diverse group, with species ranging from the simple lancelets to the complex vertebrates. Some of the key groups of chordates include: Cephalochordata (lancelets): These are small, fish-like animals that are found in marine environments. They have a notochord and a dorsal hollow nerve cord, but lack a vertebral …