Limnognathia maerski is a microscopic animal, discovered living in homothermic springs on Disko Island, Greenland in 1994, that was given its own phylum, Micrognathozoa. It is related to the rotifers and gnathostomulids, grouped together as the Gnathifera. With an average length of one-tenth of a millimetre, it's one of the smallest animals known. At first mistaken for a rotifer, on closer examination L. maerski was found to have significant differences in body structure from that of rotifers.… (More on Limnognathia)