Phylum Tardigrada

    Class Heterotardigrada

        Family Echiniscidae  Thulin, 1928

                    Bryochoerus  Marcus, 1936

                        Bryochoerus intermedius  (Murray, 1910)

                        Bryochoerus intermedius hawaiica  (Thulin, 1929)

                    Echiniscus  Schultze, 1840

                        Echiniscus arctomys  Eherberg, 1853

                        Echiniscus intermedius  Murray, 1910

                        Echiniscus mutabilis  Marray, 1906

                        Echiniscus perarmatus  Murray, 1907

                        Echiniscus sp.  -

                        Echiniscus spinulosus  (Doyere, 1840)

                        Echiniscus viridis  Murray, 1910

                    Pseudechiniscus  Thulin, 1928

                        Pseudechiniscus novaezeelandiae  (Richters, 1908)

                        Pseudechiniscus suillus  (Ehrenberg, 1853)

        Family Halechiniscidae  Thulin, 1928

                    Diplodarctus  Pollock, 1995

                        Diplodarctus anaholiensis  Pollock, 1995

                        Diplodarctus borrori  Pollock, 1995

        Family Macrobiotidae  Thulin, 1928

                    Dactylobiotus  Schuster, Nelson, Grigarick, & Chritenberry,

                        Dactylobiotus ambiguus  (Murray, 1907)

                    Diphascon  Plate, 1889

                        Diphascon (Adropion) scoticum  Murray, 1905

                    Macrobiotus  Schultze, 1834

                        Macrobiotus crassidens  Murray, 1907

                        Macrobiotus harmsworthi  (Murray, 1907)

                        Macrobiotus hufelandii  (Perty, 1834)

                        Macrobiotus occidentalis  Murray, 1910

                        Macrobiotus sp.  -

                    Minibiotus  Schuster, Nelson, & Christenberry, 1989

                        Minibiotus intermedius  (Plate, 1888)

        Family Milnesiidae 

                    Milnesium 

                        Milnesium tardigradum  Doyere, 1840

        Family Hypsibiidae  Pilato, 1969

                    Hebesuncus  Pilato, 1987

                        Hebesuncus conjungens  (Thulin, 1911)

                    Hypsibius  Thulin, 1928

                        Hypsibius canadensis  (Murray, 1910)

                        Hypsibius convergens  (Urbanowicz, 1925)

                    Ramazzottius  Binda & Pilato, 1987

                        Ramazzottius oberhauseri  (Doyere, 1840)