Ctenophore

The ctenophore is commonly referred to as a comb jelly, and they live in the world’s marine waters. The comb jellies are famous for their multiple cilia (protrusions) that they use to swim. Unlike jellyfish, ctenophores swim towards the direction where the mouth is feeding. Their bodies comprise of a jelly mass with two thick outer layers and an inner lining encasing the internal cavity. 

Most ctenophores are predators going after prey like rotifers, microscopic larvae, and small crustaceans. Two ctenophore species are parasitic with their juveniles living on the salps that feed adult members of their species.