Pariaconus namaka 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 : 41-44

Pariaconus namaka Percy sp. n. Figures 18, 47 K–U

Adult colour.

Variable, either entirely pale cream or yellow to greenish-yellow, or with head darker; a partial or weakly marked dorsal stripe extends from the head part or all the length of the body. Fore wing membrane clear or slightly fuscous.

Adult structure.

Fore wing narrow, apex bluntly acute; surface spinules distributed in all cells, but limited in c+sc; short setae on margins and veins (Fig. 18A). Antennae short (av. length 0.85); genal processes moderately short and acute (ratio VL:GP av. 2.35); short to minute setae on vertex and thorax; distal proboscis segment short (av. length 0.07); hind tibia long and slender, longer than head width (ratio HW:HT av. 0.78) (Fig. 18 B–D, G–H, K). Male terminalia (Fig. 18 E–F): paramere shorter that proctiger (ratio MP:PL 1.13), more or less parallel sided before tapering below a rounded apex with interiorly directed hook; distal aedeagus segment shorter than paramere (ratio PL:AEL av. 1.17) with base rounded and slightly inflated, and a rounded, shallow hooked apex (ratio AEL:AELH av. 2.41). Female terminalia (Fig. 18 I–J): proctiger moderately short, dorsal surface more or less straight, apex acute, anal ring long (ratio FP:RL 3.06); subgenital plate long (ratio FP:FSP av. 0.89), without or with very slight medial bulge ventrally, apex acute; ovipositor apex with reduced serrations (2 above, 0-2 below), valvulae dorsalis not strongly convex dorsally.

Egg.

Unknown.

Immature.

Colour and structure: Pale cream to orange-yellow. 5th instar: Ovoid and ventro-dorsally flattened wing buds only slightly protruding and distinct humeral lobes (Fig. 47K-L, N). Tarsi with small reduced claws (Fig. 47M). Circumanal ring wide (CPW:RW av. 4.04), and more or less straight, with a single row of uninterrupted elongate cells (Fig. 47P). Chaetotaxy: 5th instar: Continuous marginal ring of blunt, weakly bisected sectasetae (Fig. 47O). Dorsal surface is rugose and either without setae or with scattered minute simple setae. 1st instar (Fig. 47Q): Margin with broadly fan-shaped sectasetae (anterior of head with 9 pairs, 1 pair postocular, 1 pair on apices of each wing bud, 14 pairs on the abdomen).

Host plant notes.

Collected on glabrous morphotypes.

Island.

Oahu.

Distribution notes.

Only known from one locality, the high elevation bog area on Mnt Kaala.

Biology.

Immatures make pit galls on the lower leaf surface (Fig. 47 R–U), after eclosion the remaining pits are generally shallower than the likely sister taxon on Hawaii, Pariaconus dorsostriatus .

Etymology.

Named after Namaka, a sea goddess or water spirit in Hawaiian mythology, in reference to the type locality in the wet bog on top of Mnt Kaala (noun in the nominative singular standing in apposition to the generic name).

Comments.

A pit-galling habit on Oahu was only recently discovered, previously pit-gallers were only known from younger islands and their presence on Oahu together with subfossils on Kauai (see Discussion) supports an older and more widespread status for the bicoloratus group.

Type material.

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