What is "benthocodon"

Benthocodon is a genus of jellyfish of the family Rhopalonematidae. The genus only contains one known species. Unlike many hydromedusae, these jellyfish do not have a sessile stage. Rather, they spend their entire lives in the water column as plankton. The genus Benthocodon can be found near the sea floor in the Pacific Ocean from Antarctica to California to the Arctic Ocean.