Pariaconus gibbosus Percy

Percy, Diana M., 2017, Making the most of your host: the Metrosideros-feeding psyllids (Hemiptera, Psylloidea) of the Hawaiian Islands, ZooKeys 649, pp. 1-163 : 45-46

Pariaconus gibbosus Percy sp. n. Figure 20

Adult colour.

Most specimens examined are almost entirely dark brown to black, however, as with Pariaconus minutus , it is likely there are paler forms, such as when newly emerged. Fore wing membrane clear to moderately fuscous.

Adult structure.

Fore wing apex rounded; surface spinules fairly densely distributed in all cells; setae on margins and veins minute (Fig. 20A). Antennae short (av. length 0.52; ratio AL:HW av. 1.03); genal processes extremely short (ratio VL:GP av. 8.21); minute setae on vertex and thorax; distal proboscis segment short (av. length 0.07); hind tibia shorter than head width (ratio HW:HT av. 1.10) (Fig. 20 B–G). Male terminalia (Fig. 20 H–J): length of paramere and proctiger subequal (ratio MP:PL 1.03), paramere broad, slightly sinuous (curving posteriorly at the apex), apex hook interiorly directed; length of distal aedeagus segment longer than paramere (ratio PL:AEL 0.89), base rounded and slightly inflated, apex developed into broadly rounded hook with acute apex (ratio AEL:AELH 2.75). Female terminalia (Fig. 20 K–L): proctiger dorsal surface more or less straight, anal ring long (ratio FP:RL av. 2.51), apex acute; subgenital plate with slight medial bulge ventrally, apex acute; ovipositor apex with two reduced serrations above and below, valvulae dorsalis strongly convex dorsally (Fig. 20L).

Egg.

Unknown.

Immature.

Unknown.

Host plant notes.

Collected from pubescent morphotypes.

Island.

Maui.

Distribution notes.

Only known from eastern Maui, in the Makawao area.

Biology.

Unknown, but likely to be pit galling given the biology of the sister taxon, Pariaconus minutus .

Etymology.

Named for the more dorsally humped ( gibbosus ) shape of paramere apex, aedeagus apex, and ovipositor valvulae dorsalis that distinguishes this species from the sister taxon, Pariaconus minutus (adjective in the nominative singular).

Comments.

Adults of this species are easily confused with Pariaconus gracilis in the field. However, Maui is currently the only island where both species occur. Both species are often almost entirely dark brown to black, and similar in overall size.

Type material.

Holotype male (slide mounted, BMNH). See Table 2 for details of type and other material examined for this study.