red planaria flatworms - convolutriloba retrogemma

acropora animal animals aquarium aquatic biological biology bright close closeup color colorful colour convolutriloba creature detail eater exotic fauna flat flatworm flatworms glass invert invertebrate invertebrates inverts isolated life macro maricola mariculture marine microscope microscopic natural nature oceanography parasite pest pharynx photography planaria planarian platyhelminthes predator red redbug reddish reef regeneration retrogemma rust saltwater scientific sea seawater shape small tank tiny tropical turbellaria undersea underwater unique water wild worm zoological zoology