Swezeyana elongagena Caldwell, 1940

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

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Swezeyana elongagena Caldwell, 1940


Swezeyana elongagena Caldwell, 1940  Figures 1A, 3

Swezeyana elongagena  Caldwell, 1940: 390.


Adult. General body colour green to yellow-green or yellow-brown, last 3-5 antennal segments darker brown to black, apices of genae sometimes pinkish-red. Fore wing membrane uniformly pale fuscous (Fig. 1A). Fore wing apex acute to bluntly acute; pseudopterostigma relatively short to medium long (Fig. 3P), none to few (1-3) cross pseudoveins in cell r1; surface spinules sparsely distributed, apparently absent from c+sc (Fig. 3O); medium long setae on ventral margin and medium short to short setae on veins and dorsal margin. Antennae medium long (ratio AL:HW 1.54-1.78) (Fig. 3D); genal processes long (GP > 0.40 mm, ratio HW:GP < 1.35) and often upturned at apices (Fig. 3 A–B); short to medium short setae on vertex and thorax. Meracanthus small (Fig. 3N), genual spine reduced (Fig. 3L). Male terminalia (Fig. 3 G–I): paramere slender, long (ratio PL:HW > 0.27), tapering to anteriorly projecting apex with two short stout setae; distal aedeagus segment short relative to paramere (ratio PL:AEL 1.46-1.56), apex developed into a large rounded hook with blunt apex. Female terminalia (Fig. 3 E–F): proctiger dorsal surface strongly convex apically, apex broad, blunt, bearing medial cleft and fringed with stout setae, anal ring long (ratio FP:RL 1.41-1.95), with reduced head compartment at proximal end, distal portion of ring margin smooth; subgenital plate convex with medial cleft pronounced (almost half length of subgenital plate).

Egg. Pale with well-defined hexagonal (honeycomb-like) sculpturing dorsally (Fig. 3J).

Immature. Described and illustrated by Caldwell (1940) and Tuthill (1966). Although Caldwell refers to marginal “sectasetae” in his description, he illustrates distinctly fan-shaped and apparently unbisected setae. Tuthill provides an image of an immature with long "wax filaments" produced by dorsal pores, and notes that free-living immatures were observed mostly on the upper, but also lower, leaf surfaces. Both descriptions suggest notable morphological differences to immatures described here for S. reticulata  and S. tentaculata  sp. n.

Host plant.

Planchonella sandwicensis  .


Maui, Molokai (a single female specimen recorded from Kauai, and apparently now missing, is queried in Zimmerman (1948), and may have been S. magna  sp. n.). Specimens from Molokai are close to the type specimens from Maui, and currently this species is considered to be restricted to these two islands.


Although Caldwell’s (1940) illustration only indicates a single cross pseudovein, examination of the type specimen revealed three unpigmented pseudoveins. A single female paratype collected from Kalalau Trail, Kauai, is likely to be S. magna  sp. n. (see also assignment in error comment in Zimmerman 1948)

Material examined.

Holotype female (slide mounted), Haelaau, Maui, USA, ex Planchonella  sp., 19 December 1928 (BPBM). Paratypes: 10m 5f, same data as holotype (not located). Other material: 5m 4f, Kamakou Preserve, Molokai, USA, N21.1236, W-156.9108, ex Planchonella sandwicensis  , 17 August 2003, “Hi20-03” D. Percy leg. (BMNH).

Gene sequences.

MG988832 (COI) MG989153 (cytB) (Hi20-03).