原哺乳亞綱
Prototheria \Pro`to*the"ri*a\, n. pl. [NL., from Gr. prw^tos first + qhri`on, dim. of qh`r beast.] (Zo["o]l.) Same as {Monotremata}.
Prototheria n : echidnas; platypus [syn: {subclass Prototheria}]
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