Ctenophora is a phylum of Animalia kingdom. They are commonly called as comb jellies or sea walnuts.
Bioluminescence ( the property of living organisms to emit light ) is the distinguish property of these animals.
They are bisexual animals and the reproduction is sexual.
Fertilisation is external and development is indirect with larval stage called cydippid.
The Cydippid larva of Ctenophora is ovoid or spherical with a pair of retractable tentacles.They are free swimming larvae, which swim with the help of cilia.