Jellyfish or jellies are softbodied, free-swimming aquatic animals with a gelatinous umbrella-shaped bell and trailing tentacles. The bell can pulsate to acquire propulsion and locomotion. 
Classification of Jellyfish:
*Hydrozoa
*Siphonophorae
*Stauromedusae
*Polypodium Hydriforme
Photo taken by me at Kuakata sea beach, Potuakhali,Bangladesh.