Ponape, Seniavin group.
Hitherto treated as conspecific with Z. cinereus (and hence previously often with Z. finschii), but differs in its much shorter bill (effect size for females –5.56, score 3); dull mid-brown vs mouse-grey upperparts (3); very slight reduction of buffy tinge to pale grey underparts (ns); higher-pitched somewhat hoarse/hissing call-notes vs rather loud sparrow-like chirps (4)#R. Song may also be different (unclear from available recordings whether song recorded or not). Monotypic.
Pohnpei, in EC Caroline Is.
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