Petroscirtes lupus (De Vis, 1886)
Common in the Solitary Islands Marine Park. Distributed throughout the Western Pacific region, Australia and New Caledonia. In Australia recorded from Central Queensland south to southern New South Wales and including Lord Howe Island.
Typically found in quiet coastal bays and estuaries or vegetated rocky reef. Often found inside bottles, pipe or cans.
Specimen pictured in top photograph was living in the bottle at bottom right of picture, note elongated first dorsal fin ray of male. Lower photograph shows courting couple with female in foreground. Grows to 13cm.