A phylum exclusively marine is
The characters given below are those of a phylum. Identify the phylum.
1. Rows of cilia that help in locomotion
2. Soft-bodied
3. Exclusively marine creatures with specimens found in very deep seas
4. Exhibit bioluminescence
Exclusively marine animals with triploblastic and deuterostome nature, which are considered as the real baseline for evolution of chordates are categorised in the phylum _____