phylum porifera definition

Phylum Porifera - Primitive multicellular animals with cellular grade of organisation. Free living aquatic, mostly marine, sedentary forms either solitary or colonial. Body with a large number of incurrent pores called ostia leading into a spongocoel through a system of canals, ..

Primitive multicellular animals with cellular grade of organisation. Free living aquatic, mostly marine, sedentary forms either solitary or colonia..

Features of Porifera..

The simplest multicellular animals. The cells are loosely held together and do not form tissues. Ostia (pores) are present all over the body, with a single large opening on top called osculu..

Phylum Chordata is characterized by three unique features, at least during the early stages of their developmen..

Phylum Chordata - This phylum is characterized by three unique features, at least during the early stages of their development. A rod like structure called notochord lying above the digestive tract. A tubular nerve cord lying above the notochord. A pair of gill slits in the phar..

Features of Hemichordata..

Phylum Echinodermata - Star fish Marine in habitat. Body is radially symmetrical, star shaped, spherical or elongate, Exoskeleton is spiny. Head is absent and five radially arranged arms present. Locomotion is with the help of tube feet. Sexes are separate. Example: Asterias (star fish), ..

Features of Mollusca..