odditiesoflife: The Amazing Jellies Jellyfish or jellies are the major non-polyp form of individuals
odditiesoflife: The Amazing Jellies Jellyfish or jellies are the major non-polyp form of individuals of the phylum Cnidaria. They are free-swimming marine animals consisting of a gelatinous umbrella-shaped bell and trailing tentacles. Most jellies are bioluminescent (self-producing light), resembling colorful, floating lamps. Jellyfish have roamed the seas for 500 to 700 million years, making them the oldest multi-organ animal on the planet. source 1, 2 -- source link