According to the Smithsonian National Museum of Natural History, scientists divide the more than 4,000 species known as jellyfish into four groups: Scyphozoa or "true" jellyfish, Cubozoa or box ...

A video shared in a Feb. 21, 2025, X post claimed to show a "mesmerizing yet eerie" jellyfish moving across the seafloor. The ...

This important study advances our understanding of early Cambrian cnidarian paleoecology and suggests that the reconstructed ancestral feeding and respiration mechanisms predate jet-propelled swimming ...