Classification with its Justification

Kingdom Animalia Animals, multi-cellular organisms with cells that lack a cell wall, many capable of movement or movement of some of their body parts or capable of movement at some time of their life cycle; heterotropliic nutrition.

Sub-kingdom Eumetazoa Animals with tissues and organs.

Grade I Bilateral Bilateral animals

Division Deuterostomia Cleavage is radial and usually indeterminate, mouth arising some distance interiorly from blastopore. Mesoderm and coelom develop primitively from out-pocketing s of the primitive gut.

Phylum Echinodermata Secondary radial symmetry, endoskeletal plates.