Sometimes considered conspecific with M. oceanica (see above), M. erythrops and the extinct †M. freycineti. Differs from M. erythrops in characters given under that species. From M. oceanica in its considerably smaller bill (effect size for males −4.3, score 2); rather longer tail (effect size for males 2.46, score 2); all-dark vs variably coloured plumage (4); and seemingly different call#R, although analysis reveals most vocabulary shared (hence score only 1)#R. From †M. freycineti in its much larger size, most notably longer tail (effect size for males 8.1, score 3); all-dark vs variably coloured plumage (4); apparently different call#R (allow 2). This arrangement is supported by molecular evidence#R#R. Monotypic.
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