A Stealthy Swimmer

Aegina, a type of jellyfish, swims through the water.
(© 2014 KJ Osborn, Smithsonian )

Aegina are narcomedusae, a type of jellyfish. These small, pulsing animals are one of the most abundant jellies at 300 meters (980 feet). Not a lot is known about the many species of Aegina—researchers doing genetic work have found numerous species in the northeast Pacific alone that are yet to be named.