Pariaconus nigrilineatus 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 : 28-31

Pariaconus nigrilineatus Percy sp. n. Figure 9

Adult colour.

Typically bicoloured, generally pale cream-yellow thorax and abdomen, head darker and a dark dorsal stripe from the head extending part or all the length of the body (Fig. 9D). Fore wing membrane slightly fuscous.

Adult structure.

Fore wing apex rounded; surface spinules dispersed in all cells but reduced coverage in r1 and c+sc; setae on margins and veins short to minute (Fig. 9A). Antennae short (av. length 0.59; ratio AL:HW av. 1.15); genal processes short and bluntly rounded (ratio VL:GP av. 5.42); short setae on vertex, minute on thorax; vertex comparatively wide (ratio HW:VW av. 1.67); distal proboscis segment moderately long (av. length 0.10); hind tibia slender, shorter than head width (ratio HW:HT av. 1.08) (Fig. 9 B–C, E, H). Female terminalia (Fig. 9F): proctiger dorsal surface more or less straight, longer than subgenital plate (ratio FP:FSP av. 1.35), apex acute, anal ring moderately long (ratio FP:RL av. 3.51); subgenital plate with no or slight medial bulge ventrally, apex acute; ovipositor apex with no or reduced serrations (2 above and below), valvulae dorsalis not strongly convex dorsally.

Egg.

Unpigmented or light brown, narrow, slender, entire surface with narrowly spaced uninterrupted striations no visible pedicel, tail short (Fig. 9G).

Immature.

Unknown.

Host plant notes.

Collected from semi-glabrous morphotype growing on lava flow (dated to 1880s) in south western Hawaii.

Island.

Hawaii.

Distribution notes.

Known from only one locality.

Biology.

Unknown, but may be free-living as for Pariaconus nigricapitus and Pariaconus proboscideus .

Etymology.

In reference to the dark dorsal stripe that is frequently present in this species and signifies affiliation with the bicoloratus group (adjective in the nominative singular).

Comments.

Currently known only from females; females appear particularly similar to Pariaconus lona from Molokai, however DNA analysis does not even place these two taxa in the same subgroup of the bicoloratus group, and this exemplifies the need for additional efforts to sample species diversity more completely.

Type material.

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