phylum protozoa primitive animals

Phylum Protozoa (Primitive Animals)..

Unicellular (single celled) animals.Nutrition is heterotropi..

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 o..

This is the largest phylum with almost 80% of the animals kingdom in this phyla. Body is bilaterally symmetrical and segmented. It is divided into head, thorax and abdome..

Features of Arthropoda..

Body is bilaterally symmetrical and segmented. It is divided into head, thorax and abdome..

Radially symmetrical, diploblastic multicellular animals with a tissue grade of organisation. Aquatic, freshwater or marine solitary or colonial forms which may be free swimming or sedentar..

Mostly parasitic (in animals and plants), a few free living called as flukes. Body is long, cylindrical, fusiform (pointed at both the ends..

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), Echinus (sea urc..