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Transparent sea jelly

Jellies in the Class Hydrozoa are transparent and easily overlooked.
(K. Raskoff, Monterey Peninsula College, Hidden Ocean 2005, NOAA)

Many jellyfish in the class Hydrozoa, such as this hydromedusa Aglantha digitale, are transparent and easily overlooked. Learn more about hydrozoan jellies and other jellyfish, and see more pictures of Arctic animals in the “Under Arctic Ice” photo essay.