Franco Banfi / Scuba diver watching Freshwater jellyfish (Craspedacusta sowerbii) Lugano lake, Ticino, Switzerland. August 2015. Invasive species.

Alex Mustard / Clinging jellyfish (Conionemus vertens) swimming in open water. The orange structures are reproductive organs. This species gets its name because it is able to cling to seagrass and algae. Browning Pa...

Alex Mustard / Clinging jellyfish (Gonionemus vertens) swimming in mid-water, Browning Pass, Vancouver Island, British Columbia, Canada, Queen Charlotte Strait, Pacific Ocean.

Shane Gross / Clinging jellyfish (Gonionemus vertens) sticking to Eelgrass (Zostera marina), Prince William Sound, Alaska, USA, Pacific Ocean.

Franco Banfi / Freshwater jellyfish (Craspedacusta sowerbii), an invasive species, portrait, Lugano lake, Ticino, Switzerland.