Phylum Tardigrada Doyère, 1840 - tardigrades Order Heterotardigrada Marcus, 1927 see Class Heterotardigrada Marcus, 1927 1 Suborder Arthrotardigrada Marcus, 1927 see Order Arthrotardigrada Marcus, 1927 2 Suborder Echiniscoidea Richters, 1926 see Order Echiniscoidea Richters, 1926