Swezeyana tentaculata, Percy, Diana M., 2018

Percy, Diana M., 2018, Revision of the Hawaiian psyllid genus Swezeyana, with descriptions of seven new species (Hemiptera, Psylloidea, Triozidae), ZooKeys 758, pp. 75-113 : 75

Swezeyana tentaculata sp. n. Figures 1H, 10

Diagnosis.

Medium sized, red-brown species, with fore wing membrane patterned, antennae medium long, genal processes long, paramere short, and female proctiger more or less straight dorsally.

Description.

Adult. General body colour red to red-brown, last 2-3 antennal segments darker brown. Fore wing distinctly patterned with irregular clouds of red-brown pigmentation, darker brown patches indicate position of cross pseudoveins, intersections of veins and wing margin, as well as two brown patches on the dorsal claval wing margin, and on vein R+M+Cu1 just basal to vein trifurcation, there are distinctly unpigmented areas surrounding marginal clusters of radular spines (Figs 1H, 10S). Fore wing apex bluntly acute; pseudopterostigma short (Fig. 10R), 4-6 cross pseudoveins in cell r1 (Fig. 10 R–S); surface spinules densely distributed in all cells; long setae on ventral margin and medium short to short setae on veins and dorsal margin. Antennae medium long (ratio AL:HW 1.40-1.61) (Fig. 10C, E–F); genal processes long (GP ≥ 0.35 mm, ratio HW:GP ≤ 1.35) and upturned at apices (Figs 10 A–C); medium short to short setae on vertex and thorax. Meracanthus reduced, almost absent, genual spine developed (Fig. 10H). Male terminalia (Fig. 10 P–Q): paramere short (ratio PL:HW <0.30), tapering to apex with two short stout setae; distal aedeagus segment long relative to paramere (ratio PL:AEL <0.90), apex developed into a large rounded hook with acute apex. Female terminalia (Fig. 10 I–N): proctiger dorsal surface more or less straight, tapering to bluntly acute apex without medial cleft, anal ring relatively short (ratio FP:RL 2.24-2.59), with well-developed head compartment at proximal end, distal portion of ring margin convoluted; subgenital plate more or less straight ventrally with little or no medial cleft and with beak and membrane slightly extended (Fig. 9 L–N).

Egg. Pale, sculpturing consisting of rounded indentations dorsally (Fig. 10O).

Immature. Colour: Mostly red-brown, some cream mottling. Structure: 5th instar with circumanal ring wide, slightly constricted medially and lateral apices upturned, with a single row of uninterrupted elongate cells (Fig. 13I). Chaetotaxy: 5th instar with marginal, pointed sectasetae, and sub-marginal longer acute, simple setae on enlarged, ridged annuli or pediments (Fig. 13H, J–K); dorsal surface rugose, with small club setae, and with distinct arrangement of 28 protruding tubercles and tentacles (13 on head and thorax, 15 on abdomen, of these 10 are medial, and 18 are lateral or sub-marginal), all but 4 of the dorso-medial protuberances (on abdomen) are developed into elongate tentacles bearing scattered small, blunt, simple setae on the apical portion, and small club setae on the basal portion, tentacle apices bear 1-2 acute simple setae (Fig. 13L). 3rd - 4th instar chaetotaxy and tubercle/tentacle arrangement similar to 5th instar (Fig. 12 G–J); in 3rd instars the lateral and submarginal tubercles bear 2 club setae at the apices (Fig. 12I), and the dorso-medial tubercles destined to become tentacles are larger and bear several club setae (Fig. 12H), by 4th instar elongation into tentacles is already evident. Somewhat more darkly pigmented tentacles are found in the same position as described for S. reticulata (the distal medial tentacles on thorax and abdomen, and the proximal lateral tentacles on abdomen; Fig. 13H, K). The tentacles are also evident in photographs of immatures on the leaf surface (Fig. N).

Immature measurements (mm) and ratios: 5th instar (n = 3): BL 1.48-1.52; BW 0.91-0.97; WPL 0.73-0.76; CPL 0.64; CPW 0.76; RW 0.16-0.17; HW 0.48-0.52; AL 0.18; BL:BW 1.56-1.63; HW:AL 2.61-2.95; CPW:RW 4.51-4.92.

Host plant.

Planchonella sandwicensis .

Distribution.

Kauai. Only known from Kokee State Park.

Etymology.

Named for the distinctly long tentacles on the dorsum of immatures (adjective in the nominative singular).

Comments.

Found sympatrically with S. reticulata and S. elongagena on the same individual plants. Immatures were observed among the ferugineous trichomes on the undersides of leaves, often along the leaf mid-rib (Fig. 13N).

Material examined.

Holotype male (slide mounted), Kokee State Park, Kauai, USA, N22.1444, W-159.6477, ex Planchonella sandwicensis , 29 October 2005, “Hi01-05” D. Percy leg. (BMNH). Paratypes (slide mounted) 3f 7i, as for holotype (BMNH). Other material: 2m 2f, Kokee State Park, Kauai, USA, N22.1309, W-159.6388, ex Planchonella sandwicensis , 30 October 2005, “Hi05-05” D. Percy leg. (BMNH).

Gene sequences.

MG989157 (cytB) (Hi01-05).