Copepods are the most dominant zooplankton taxa in the oceans. Copepods are used as parasitic hosts by various organisms. The photograph of the LASBOS card shows a carnivorous copepod: Heterorhabdus tanneri with approximately 5 mm body length and found for the deep-seas of the North Pacific Ocean. The dots inside the body are all the parasitic ciliates. Parasitic ciliates do not affect the copepod swimming ability, but they consume other tissues within the body. There are many species of ciliates that spend free-living lives in the water column.