The western blue devil (Paraplesiops sinclairi) is a species of fish in the longfin family Plesiopidae endemic to Western Australia.

[1] The fish is found in rocky reef habitats in the coastal, inshore waters of southwestern Western Australia, from the Recherche Archipelago to Lancelin.

[1] The specific name was coined as a memorial to the ichthyologist Nicholas Sinclair of the Australian Museum who was involved in the collection of the type specimens.

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