Plectroglyphidodon johnstonianus (Fowler and Ball, 1924)
Relatively common in the Solitary Islands Marine Park. Found throughout the Indo-Pacific: East Africa to the Hawaiian, Marquesan, and Pitcairn islands, north to the Ryukyu and Bonin islands, south to Lord Howe Island and Rapa. In Australia found from Geraldton north to Exmouth in Western Australia and from northern Queensland as far south as northern New South Wales and including Lord Howe and Norfolk Island.
Frequents areas of branching corals, particularly Acropora, Stylophora or Pocillopora. Mainly clear water at outer reef and oceanic locations, reef passages. Depth range to 18m.
Male and female pair during breeding, eggs are demersal and attached to substrate where the males guard and aerate them until they hatch. Similar in shape and size to Dick's Damsel, Plectroglyphidodon dickii, which is white posteriorly of the black bar. Grows to 14cm.