Comb jellies belong to Ctenophora.
Ctenophores are free-swimming, transparent, jelly-like, soft-bodied, marine animals having biradial symmetry, comb-like ciliary plates for locomotion, the lasso cells, but nematocysts are wanting. They are also known as sea walnuts or comb jellies. Their nervous system is diffused types, and the aboral end bears a sensory organ called statocyst.
- They have a pair of long, solid, retractile tentacles.
- They lack asexual reproduction and alternation of generation.
- They lack skeletal, circulatory, respiratory, and excretory organs.
- Their body organization is cell- tissue grade.