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In page Pale-blue monarch:

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The pale-blue monarch was originally described in the genus Myiagra and then classified as subspecies of the widespread black-naped monarch, Hypothymis azurea, until split by the IOC in 2013 to describe a new species.[1] Some other authourities have not yet adopted this species split.[2] The alternate name Moluccan monarch should not be confused with the species of the same name, Symposiachrus bimaculatus. Additional alternate names for the pale-blue monarch include Pacific monarch (a name shared with the buff-bellied monarch), Pacific small monarch and small monarch.