Previously placed in genus Polyborus, now shown to be invalid as type unidentifiable#R#R. Frequently treated as a race of C. cheriway, and, together with latter, often regarded as race of C. plancus. Initial DNA studies, however, suggested that present form was a distinct species#R, and this view was supported by later molecular analysis#R. Monotypic.
Guadalupe I, off W Baja California, NW Mexico.
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