List out the diagnostic features of phylum Ctenophora.

Explanation

1. The animals are marine, diploblastic and radially symmetrical.
2. They have eight external rows of ciliated comb plates which help in locomotion.
3. Bioluminescence is seen.
4. They lack nematocysts but have lasso cells which help in food capture.
5. Digestion is by both extracellular and intracellular.
6. Sexual reproduction is seen.
7. Fertilization is external and development is indirect.
8. Cydippid larva is seen. e.g., Pleurobrachia.