Belongs to the large species-group centred on P. purpuratus (which see); within this, forms part of the subgroup centred on P. porphyraceus (which see); genetic data place it closest to P. richardsii#R. Monotypic.
Northern Mariana Is (Saipan, Tinian, Agiguan and Rota). Extirpated on Guam#R.
Food and feeding
Status and conservation
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