Fun Facts About Sea Jellies (Jellyfish)
Sea jellies, often misnamed jellyfish due to their lack of a skeletal system, are boneless invertebrates belonging to the phylum Cnidaria. Unlike true fish, they lack a heart, brain, and gills, instead relying on a decentralized "nerve net" to sense environmental changes and thin, gelatinous tissue to absorb oxygen directly from the water. These resilient organisms have inhabited the world’s oceans for over 500 million years, predating dinosaurs and surviving multiple mass extinction events. Their simple yet effective biological design, which includes specialized stinging cells and a support…
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