a) Platyhelminthes :
(i) Bilaterally symmetrical
(ii) No body cavity
(iii) Dorsiventrally flattened
(iv) Flatworms / Free living or parasitic
(v) Triploblastic
(b) Nematoda :
(i) Bilaterally symmetrical
(ii) Triploblastic
(iii) Tissue level of organisation, but no real ^Organs
(iv) Pseudocoelom