Parachela is an order of tardigrades in the class Eutardigrada. Members of this order have existed for at least 72 million years, including the present. The oldest known species is Beorn leggi. Superfamilies and families The order includes the following superfamilies and families: Eohypsiboiidea Eohypsibiidae Hypsibioidea Calohypsibiidae Hypsibiidae Microhypsibiidae Ramazzottiidae Isohypsibioidea Hexapodibiidae Isohypsibiidae Macrobiotoidea Beornidae Macrobiotidae Murrayidae Necopinatidae Richtersiidae References External links Protostome orders Polyextremophiles