Bioluminescence — the ability of a living organism to emit light — is well-marked in members of phylum

1. Ctenophora, or comb jellies, are exclusively marine diploblastic animals. 2. They possess eight rows of ciliated comb plates that aid locomotion. 3. Bioluminescence is a diagnostic feature of ctenophores. 4. Cnidarians can bioluminesce but not to the degree characteristic of ctenophores. _Source: syllabus Biology, Ch 4 "Animal Kingdom", §4.2.3_