TurritopsisTurritopsis is a genus of hydrozoans in the family Oceaniidae.SpeciesAccording to the World Register of Marine Species, this genus includes the following species:Turritopsis chevalense – species inquirendaTurritopsis dohrnii also known as the "Benjamin Button jellyfish", or the "immortal jellyfish". It can reverse its life cycle and transform itself back to a polyp.Turritopsis fascicularis Turritopsis lata Turritopsis minor Turritopsis nutricula Turritopsis pacifica Turritopsis pleurostoma – species inquirendaTurritopsis polycirrha ''Turritopsis rubra''