Member of a group of dark-coloured, iridescent Asian and Australasian forms, including C. janthina, †C. jouyi, C. vitiensis and C. leucomela; C. pallidiceps may also be related. Monotypic.
Nakondo Shima, Peel I (Chichi-jima) and probably other islands of Bonin Is (Ogasawara-shoto), Japan#R.
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