An integrative redescription of Echiniscus testudo (Doyère, 1840), the nominal taxon for the class Heterotardigrada (Ecdysozoa: Panarthropoda: Tardigrada)
Keywords: Appendage configuration; Cosmopolitan species; Echiniscidae; Echiniscus filamentosus; E. glaber; E. mongoliensiscomb. nov.; Intraspecific variability; Polyphyly; Ventral armature;