Pariaconus proboscideus 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 : 31-33

Pariaconus proboscideus Percy sp. n. Figures 11, 45 F–K

Adult colour.

Typically bicoloured, generally pale cream-yellow thorax and abdomen, head brown or black, apparently lacking dorsal stripe. Fore wing membrane slightly fuscous.

Adult structure.

Fore wing apex rounded; surface spinules dispersed, usually in all cells except may be reduced or absent from cell r1 and c+sc; short setae on margins and veins (Fig. 11A). Antennae short (av. length 0.70; ratio AL:HW av. 1.52); genal processes short (ratio VL:GP av. 3.81); short to minute setae on vertex and thorax; distal proboscis segment atypically long (av. length 0.14); hind tibia longer than width of head (ratio HW:HT av. 0.90) (Fig. 11 B–C, F–H). Male terminalia (Fig. 11 D–E): paramere shorter than proctiger (ratio MP:PL av. 1.13), but slender and slightly sinusoidal, small interior directed hook at apex (Fig. 11E); distal aedeagus segment length subequal to paramere (ratio PL:AEL av. 1.04), base angular and moderately inflated, apex developed into a hook with bluntly acute apex (Fig. 11E) (ratio AEL:AELH av. 2.45). Female terminalia (Fig. 11 I–J, L-M): proctiger long, slender, dorsal surface more or less straight, longer than subgenital plate (ratio FP:FSP av. 1.33), apex acute, anal ring short (ratio FP:RL av. 2.95); subgenital plate with slight medial bulge ventrally, apex acute; ovipositor apex with reduced serrations (0-2 above, 2-3 below), valvulae dorsalis not strongly convex dorsally.

Egg.

Unpigmented, broad, surface covered with long uninterrupted striations, short pedicel positioned 1/4 length from base, tail moderately long (Fig. 11K).

Immature.

Colour and structure 5th instar: Appearance is white and spikey (hedgehog-like) due to coverage of stiff white filaments produced from sectasetae (Fig. 45F). Narrowly ovoid in outline with wing buds protruding and distinct humeral lobes (Fig. 45 I–J). Tarsi with small reduced claws (Fig. 45H). Circumanal ring moderately wide (CPW:RW av. 3.72), and shallowly v-shaped, with a single row of uninterrupted elongate cells (Fig. 45K). Chaetotaxy 5th instar: Entire dorsal surface and margins covered with pointed sectasetae (Fig. 45G).

Host plant notes.

On pubescent and tomentose morphotypes.

Island.

Hawaii.

Distribution notes.

Widespread on Hawaii: DNA analysis indicates distinct clusters of individuals from (a) Kohala as basal and sister to (b) Kau, (c) Saddle Road, and (d) Hualalai.

Biology.

This species is free-living on the undersides of pubescent leaves.

Etymology.

Named for the distinctly longer distal proboscis segment (adjective in the nominative singular).

Type material.

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