Taxonomy

This phylum derives its name from one of the common characteristics of this group namely the notochord (Gr. noton, back + L. chorda, cord). The…

The chordates exhibit an astonishing diversity in form, physiology and habits. The number of chordate species is limited. About 49,000 species are on record which…

Phylum Nematoda are the popular round worms. The body is narrow and pointed at both the ends. There are no body segments. The body is covered…

Phylum Annelida are worm like animals. The body segments are rings externally. Internally the segments are seperated by septa. Externally the body is protected by a…

Phylum Arthropoda are the most successful group of animals. They outnumber all other animals in population strength. The body is segmented. It is covered by a…

Phylum Mollusca is a very successful and diverse group of animals. Considered to be the second largest group of animals with regard to species number. These…

Phylum Echinodermata are marine organisms. While the adults are radially symmetrical the larvae remain bilaterally symmetrical. The mouth is on the lower surface. The Echinodermata is…

Platyhelminthes phylum includes flatworms. These are acoelomates, without a body cavity called coelom. The alimentary canal is either absent or very simple. Excretion and osmoregulation occur…

All coelenterates are aquatic animals. They are mostly marine. The body is radially symmetrical. The body wall is of two layers of cells. The outer…

Phylum : Protozoa This phylum includes a great diversity of small, microscopic organ-isms. These are single celled eukaryotes. Protozoa are one-celled animals found worldwide in…