The 5 Kingdom Classification as proposed by Whittaker for classifying animals were:
1. Protista
2. Animalia.
3. Fungi.
4. Plantae.
5. Molluscans.
Protista are the "Pore" Bearing organisms which posses porous ossicules for exchange of fluids and ions in the body. For e.g. Porifera is a Phylum under this segment which comprises of such body forms.