Trioza tristericis, Burckhardt, Daniel, Diaz, Fiorella & Queiroz, Dalva L., 2017

Burckhardt, Daniel, Diaz, Fiorella & Queiroz, Dalva L., 2017, Four new neotropical Trioza species associated with Loranthaceae (Santalales) and comments on mistletoe inhabiting psyllids (Hemiptera, Psylloidea), Alpine Entomology 1, pp. 91-108 : 97

Trioza tristericis sp. n. Figs 5, 6, 13, 14, 23-25, 36-38, 46

Material examined.

Chile: holotype ♀, V Region, Province Los Andes, Aconcagua Valley, 25 km W Portillo, route 60, Valle Aconcagua, -32.8333 -70.1333, 1900-2100 m, 1.xii.1993, subalpine/alpine scrub (D. Burckhardt) DB#1(-) (MHNG, dry).

Paratypes: Chile: 10 ♂, 10 ♀, IV Region, Province Limarí, Hurtado, -30.2768 -70.6660, 19.ii.1985, Tristerix sp. (D. Hollis) (BMNH, dry, BMNH(E)1271039); 1 ♀, Region Metropolitana, Province Santiago, between Corral Quemado and Farellones, -33.3451 -70.3334, 1700 m, 19.v.1993, open mediterranean scrub, Tristerix sp. (D. Burckhardt) DB#14(4) (MHNG, dry); 1 ♂, 4 ♀, 5 immatures, same but Province Tiltil, Cuesta La Dormida, 7-10 km W Tiltil, -33.0667 -71.0333, 950-1200 m, 28.xii.1993, mediterranean sclerophyll scrub, Tristerix corymbosus , DB#41(5) (MHNG, dry, slide); 4 ♂, 8 ♀, V Region, same as holotype (MHNG, NHMB, dry, slide, NMB-PSYLL0004524-NMB-PSYLL0004526); 1 ♀, same but km 19 Portillo to Río Blanco, -32.8671 -70.1863, 1900 m, 23.xii.1995, subalpine scrub, Tristerix verticillatus , DB#20(6) (MHNG, dry); 1 ♂, same but Portillo to Río Blanco, -32.8718 -70.1985, 1900 m, 24.xii.1998, gully with a few shrubs and small trees along river and subalpine scrub, Tristerix sp., DB#7(7) (NHMB, dry, NMB-PSYLL0004474); 1 ♀, same but Province Petorca, Cuesta El Melón, -32.6067 -71.2400, 600 m, 23.ii.2009, degraded Acacia caven steppe and sclerophyll scrub on slope, DB#3 (NHMB, dry, NMB-PSYLL0004475; 1 ♀, same but Province Quillota, La Campana National Park, -32.9721 -71.0735, 1100 m, 11.i.1985, Tristerix sp. (D. Hollis) (BMNH, dry, BMNH(E)-1271160); 5 ♂, 11 ♀, 2 immatures, same but -32.9721, -71.0735, 1300 m, 11.i.1985, Tristerix sp. (BMNH, dry, BMNH(E)1271051, BMNH(E)1271268).

Diagnosis.

Member of the Trioza struthanthi -group. Body of adult orange to brown with orange to ochreous genal processes. Genal processes 0.8 times as long as vertex along mid-line, relatively evenly tapering to subacute apex. Forewing narrowly rounded, 2.7 times as long as wide. Paramere about three times as long as broad, weakly curved. Dorsal margin of female proctiger between apex of circumanal ring and base of apical process almost straight with very small bump near the middle; valvula ventralis with several small apico-ventral teeth. Fifth instar immature with distal portion of sectasetae on forewing bud 2.6 times as long as wide.

Description.

Adult (Fig. 5). Colouration. Orange to brown, intersegmental membranes orange. Genal processes orange to ochreous, tips often dirty whitish; eyes and ocelli grey; head ventrally yellow. Antennal segments 1 and 2 yellowish orange, segments 4-7 pale yellowish with apices of segments 4 and 6 brown, segments 8-10 brown to black. Meso and metathorax with indistinctly delimited longitudinal dark stripe. Thoracic pleura and venter yellow. Legs yellow, femora greyish brown. Veins of forewing light brown, membrane weakly yellowish. Abdomen almost black; male terminalia light brown, female terminalia orange to brown, apex almost black. Younger specimens dirty yellow or orange, getting gradually darker with age.

Structure. Body length ♂ 2.7-2.9 mm (2.76 ± 0.07 mm), ♀ 2.6-3.2 mm (2.97 ± 0.18 mm) (8 ♂, 10 ♀). Genal processes 0.8 times as long as vertex along mid-line, relatively evenly tapering to subacute apex (Fig. 6). Antenna 1.4-1.6 times as long as head width; segments 4 and 6 not inflated apically. Forewing (Fig. 13) narrowly lanceolate, narrowly rounded apically, 4.5-4.6 times as long as head width, 2.7 times as long as wide; surface spinules strongly reduced, present at apex of cell c+sc, base of r1, apex of r2, a few scattered spinules in m1, m2 and cu1, covering most of cu2, arranged in squares or rhombs (Fig. 14). Metatibia 0.8-0.9 times as long as head width, genual tooth small. - Terminalia as in Figs 23-25, 36-38. Male: setae on male proctiger covering a wide area in apical two thirds irregularly arranged. Paramere slightly longer than proctiger, in profile, about three times as long as broad, weakly curved; outer lobe distinctly shorter than inner lobe; outer lobe digitiform, without sclerotised subapical tooth; inner lobe with sclerotised, forward directed point; inner surface with long setae, those in basal half not conspicuously thicker than those in apical half. Distal segment of aedeagus with long, gradually expanded apical dilatation. Female: dorsal outline of proctiger between apex of circumanal ring and base of apical process almost straight with very small bump near the middle; apical process bearing several small dorsal teeth near apex. Subgenital plate, in ventral view, shallowly incised apically, with a longitudinal row of setae apically which is well separated from other setae. Oblique apex of ventral valvula with several small teeth. - Measurements see Table 2.

Fifth instar immature. Colouration. Head, thorax and abdomen orange or light brown, wing pads slightly lighter. Eyes reddish-grey. Antennae reddish in basal half, dark brown apically. Tips of tarsi brown.

Structure. Only one damaged specimen available. Distal portion of sectasetae on forewing bud 2.6 times as wide (Fig. 46).

Etymology.

The species is named after its host plant genus Tristerix ; tristericis is a noun in the genitive case.

Distribution.

Chile (Regions V and Metropolitana).

Host plants.

Tristerix corymbosus (L.) Kuijt ( Loranthaceae ); adults were also collected on Tristerix verticillatus (Ruiz & Pav.) Barlow & Wiens and T. sp. which are likely hosts.

Discussion.

Adult Trioza tristericis differ from the other six species of the T. struthanthi -group, apart from details of the male and female terminalia, as follows: from the North American species in the narrower forewing and from the South American species in the orange to brown body colour with concolorous genal processes. The fifth instar immatures of T. tristericis differ from those of T. struthanthi and T. tripodanthi in the longer and narrower marginal sectasetae. The immatures of T. vagata and the North American species of the T. struthanthi -group are unknown.