Swezeyana atra, 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 atra sp. n. Figures 1C, 4

Diagnosis.

Medium sized, dark coloured species, with fore wing membrane unpatterned, antennae medium short, genal processes long, paramere short, and female proctiger strongly convex apically.

Description.

Adult. General body colour brown to black, particularly dark on the dorsum of head and thorax. Fore wing membrane generally uniformly clear or slightly fuscous, with fuscous-brown cloud usually present around vein R and basal dorsal claval margin (Fig. 1C). Fore wing apex acute; pseudopterostigma relatively long (Fig. 4S), typically no cross pseudovein in cell r1 (one individual seen with partial cross vein); surface spinules relatively sparsely distributed but denser towards wing margin, few or absent from c+sc; medium long setae on ventral margin and medium short to short setae on veins and dorsal margin. Antennae medium short (ratio AL:HW 1.30) (Fig. 4 B–C); genal processes medium long (GP <0.40 mm, ratio HW:GP> 1.40) and slightly upturned at apices (Fig. 4B); medium short to short setae on vertex and thorax. Meracanthus extremely small (Fig. 4Q), genual spine reduced or absent (Fig. 4R). Male terminalia (Fig. 4 F–I): paramere short (ratio PL:HW <0.20), tapering to slightly anteriorly projecting apex with two short stout setae; distal aedeagus segment long relative to paramere (ratio PL:AEL 0.92-1.10), apex developed into a large rounded hook with blunt apex. Female terminalia (Fig. 4 J–P): proctiger dorsal surface strongly convex apically, apex broad, blunt, bearing medial cleft and fringed with stout setae, anal ring medium long (ratio FP:RL> 2.00), without or with reduced head compartment at proximal end, distal portion of ring margin smooth; subgenital plate slightly convex with short medial cleft (Fig. 4 N–O).

Egg. Unknown.

Immature. Unknown.

Host plant.

Planchonella sandwicensis .

Distribution.

Oahu. Only known from the Waianae Mountains.

Etymology.

Named for the dark body colouration, especially the head and thorax (adjective in the nominative singular).

Comments.

This is the darkest of the Swezeyana species. It has the shortest paramere in the elongagena group, with the shape more similar to those in the reticulata group. The distribution in the Waianae Mountains is shared with S. oahuensis , and the molecular topology places these two species as sister taxa but with weak bootstrap support (Fig. 2).

Material examined.

Holotype male (slide mounted), Waianae Mnts, Oahu, USA, N21.4585, W-158.0973, ex Planchonella sandwicensis , 5 July 2014, “Hi65-14” D. Percy leg. (BMNH). Paratype (slide mounted) 1f, as for holotype (BMNH). Other material: 1m 1f, Puu Hapapa, Central Waianae Mnts, Oahu, USA, N21.4666, W-158.1029, ex Planchonella sandwicensis , 17 May 2014, “KM14-14” K. Magnacca leg. (BMNH).

Gene sequences.

MH001521 (COI) MH001527 (cytB) (Hi65-14); MH001522 (COI) MH001528 (cytB) (KM14-14).