Microscopic Parasitic Jellyfish Discovered in Marine Worms (and Sushi).  Imagine a jellyfish stripped down to its bare essentials:  a microscopic blob of cells with stingers.  They might be small but they have everything they need to be successful as parasites.  These Myxozoans are common in fish and can cause serious diseases.  OSU researchers such as Dr. Stephen Atkinson, microbiology, are discovering the hidden sides to their life cycles and finding them in new hosts.