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Order MonotremataDomain Eukarya Kingdom Animalia Sub-kingdom Eumetazoa Sub-sub-kingdom Bilateria Metaphylum Enterocoelous Coelomates Phylum Chordata Subphylum Vertebrata Class Mammalia Subclass Prototheria Order Monotremata This group contains the egg-laying mammals, the extant species being the platypus and echidnas. Greek: monos, single + trema, hole. (Dorit et al, 1991) |