In the article one of photos is of Polypodium Hydriforme that usually have at least 5 to 6 tentacles, the other photos are of Myxobolus Cerebralis which can have from 3 to 4 tentacles. Both of these microscopic parasites can live within living cells and eventually destroy the cells, they are that small. They can spread through the bloodstream. These creatures cannot be killed with extreme cold. They reproduce by spores or by nematocysts. The more dangerous and smaller of the two is Myxobolus Cerebralis which can damage the CNS and impair brain function in vertebrates and invertebrates and can live in the cartilage, brain and the bone tissue of organisms. A lot of information on these parasites is limited to keep people guessing. Hope this helps.

In the article one of photos is of Polypodium Hydriform that usually have at least 5 to 6 tentacles, the other photos are of Myxobolus Cerebralis which can have from 3 to 4 tentacles. Both of these microscopic parasites can live within living cells and eventually destroy the cells, they are that small. They can spread through the bloodstream. These creatures cannot be killed with extreme cold. They reproduce by spores. The more dangerous and smaller of the two is Myxobolus Cerebralis which can damage the CNS and impair brain function in vertebrates and invertebrates. Hope this helps.