What is a notochord and in which animals it is found?

What is a notochord and in which animals it is found?

A notochord is a primitive beginning to the backbone. It appears in embryos as a small flexible rod made from cells from the mesoderm, which is one of the three layers of cells of embryos. Notochords are only found in the phylum chordata, a group of animals that includes humans.

What are animals which do not possess notochord called?

Non-chordates are animals without a notochord – the rod-like elastic structure that supports the body. This phylum consists of a small group of worm-like, marine species with an organ-system level of organization.

What does the vertebrate subphylum consists of?

The subphylum is one of the best known of all groups of animals. Its members include the classes Agnatha, Chondrichthyes, and Osteichthyes (all fishes); Amphibia (amphibians); Reptilia (reptiles); Aves (birds); and Mammalia (mammals).

What is pharyngeal gill slits?

Pharyngeal gill slits are a chordate feature; these are openings between the pharynx to the outside. They have been modified hin the time of evolution. In primitive chordates, these slits are used to filter food particles from the water. In fishes and some amphibians, the slits bear gills and are used for gas exchange.

What is Animal kingdom in zoology?

Animals (also called Metazoa) are multicellular, eukaryotic organisms in the biological kingdom Animalia. The scientific study of animals is known as zoology.

Which one of the following animals is a vertebrate and has fins?

Fish is a vertebrate and has fins. Vertebrate is an irregular bone with a complex structure composed of bone and some hyaline cartilage, the proportions of which vary according to the segment of the backbone and the species of vertebrate.

Who are Protochordates?

protochordate, any member of either of two invertebrate subphyla of the phylum Chordata: the Tunicata (sea squirts, salps, etc.) and the Cephalochordata (amphioxus). The other, more recent theory postulates that the chordates evolved from a small fossil group called the mitrates.