Fig. 1.

Representive images of galls induced by Hawaiian psyllids (Pariaconus spp.) on leaves of Metrosideros polymorpha. (A–C) Cone-type galls (large size) from the upper (A) and lower leaf surface (B), and an immature psyllid uncovered by dissection of the enclosing gall (C). (D–F) Flat-type galls (intermediate size) from the upper (D) and lower leaf surface (E), and an immature psyllid uncovered by dissection of the enclosing gall (F). (G–I) Pit-type galls (small size) from the upper (G) and lower leaf surface (H), and an immature psyllid developed in the hollow of the open gall (I, J). White arrows indicate immature forms of each psyllid (C, F, J).