List out the diagnostic features of phylum Ctenophora.

Explanation

Phylum: Ctenophora (G. Ktenos -comb, phoros -bearing)
Ctenophora are exclusively marine, radially symmetrical, diploblastic animals with tissue level of organisation. Though they are diploblastic, then mesoglea is different from that of enidaria. It contains amoebocytes and smooth muscle cells. They have eight external rows of ciliated comb plates (comb jellies) which help in locomotion, hence commonly called comb jellies for Sea Walnuts.