Russelliana dimorpha Serbina & Burckhardt, 2017, sp. nov.
Creators: name: Serbina, Liliya
name: Burckhardt, Daniel
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Psyllidae
Russelliana
Russelliana dimorpha

description: Russelliana dimorpha sp. nov.
(Figs 8 M, 12D, E, 17D, 22D, 27A, 31C)
Russelliana sp. cf. lycii, Burckhardt (2008b): 198.
Material examined. Holotype ♂: Argentina: Province Mendoza, Mendoza Valley, Uspallata to Potrerillos, 1700 m, 30–31.xii.1995, Lycium sp., scrub (D. Burckhardt) #30(1) (MHNG, dry).
Paratypes: Argentina: 12 ♂, 17 ♀, 4 immatures, same as holotype (D. Burckhardt) #30(1) (MHNG, NHMB, dry, on slide, 70 % ethanol).
Description. Coloration. Dimorphic, male slightly darker, general body colour yellow to brownish; female slightly lighter, general body colour yellow, forewing pattern paler than in males. Head whitish to bright yellow, genal processes usually lighter than head and thorax, genae yellow to brown; vertex yellow with bright yellow pattern; clypeus yellow to brown. Eyes yellow to dark brown, ocelli orange to red. Antenna yellow, sometines segments 1–2 orange, segments 3–8 with dark brown apices, segments 9–10 entirely dark brown. Pronotum pale to bright yellow; mesopraescutum pale to bright yellow with two yellow to orange patches along the fore margin and sometimes with two yellow to orange patches posteriorly; mesoscutum pale to bright yellow with four broad yellow to orange longitudinal stripes; mesoscutellum pale to bright yellow. Metanotum pale to bright yellow. Forewing with whitish to dark brown veins and membrane with distinct pale to dark brown pattern differring in males and females. Male forewing membrane with brown to dark brown pattern consisting of two broad transverse stripes: submarginal one stretching from apical part of costal vein to median part of cell cu1 leaving light areas in cells r2, m1, m2 and cu1 along the margin, and median one stretching from median part of vein C+Sc to apical part of claval suture; membrane between two bands colourless with sparse dark brown dots scattered over entire surface and sometimes on veins. Female forewing membrane with pale brown pattern consisting of dots occupying all cells, partly confluent in apical part and broad stripe parallel to apical margin stretching from apical part of costal vein to median part of cell cu1 leaving light areas in cells r2, m1, m2 and cu1 along the margin. Legs yellow to brownish with darker femora, meracanthus of metacoxa pale to bright yellow. Abdomen yellow to brown; terminalia yellow to orange. Female terminalia with dark apex.
Structure. Head, in profile, weakly inclined from longitudinal body axis (<45°). Vertex trapezoidal, flat with indented foveae, anteriorly produced into transverse lobe on either side of mid-line, with slightly raised hind margin around lateral ocelli, covered with microscopical setae; genal processes short, swollen, slightly conical apically, covered with short setae. Pronotum with two pronounced lateral and one relatively shallow sublateral tubercles on either side. Forewing rhomboidal; vein C+Sc strongly, unevenly curved, pterostigma long, vein Rs almost straight, strongly curved to fore margin apically; vein M slightly longer than either of veins M1+2 and M3+4; male forewing with large, very dense surface spinules, present in all cells, leaving no spinule-free stripes along the veins, irregularly spaced on pigmented areas, weakly developed on unpigmented areas and absent in the middle of the wing; female forewing with very dense surface spinules, present in all cells, leaving no spinule-free stripes along the veins, irregularly spaced, less developed on unpigmented areas; radular spinules not pronounced. Metatibia with 6 apical spurs.
Terminalia. Male. Proctiger tubular; sparsely covered with moderately long setae. Subgenital plate elongate; with sparsely spaced moderately long setae. Paramere narrowly lamellar; with recurved apico-anterior process on pedicel, and long apico-posterior lobe with inwards directed sclerotised anterior tooth situated at base of the lobe; lobe more than twice longer than process; outer face covered with moderately long setae mostly in apical half, inner face densely covered with moderately long setae. Distal segment of aedeagus moderately elongate, broadly, evenly expanding towards apex; lateral lobes moderately long, slightly dilated towards apex which is rounded and with frayed margin.—Female. Proctiger cuneate, pointed apically; dorsal margin, in profile, convex; densely covered with moderately long setae. Subgenital plate subglobular, with tiny apical process; densely covered with moderately long setae and with long setae in ventral part, dorsal margin with a row of bristles.
Host-plant. Lycium sp. (Solanaceae).
Distribution. Reported as Russelliana sp. cf. lycii from Argentina (Mendoza) (Burckhardt 2008b).
Derivation of name. From Ancient Greek δι- = two and µορφή = shape, form, figure referring to the strong sexual dimorphism of the species.
Comments. Russelliana dimorpha resembles R. capsici and lycii; see comments under R. capsici. R. dimorpha differs from the two species in longer setae on the female subgenital plate. It differs from R. capsici in the presence of sexual dimorphism, and from R. lycii in a recurved apico-anterior process of the paramere and a subgenital plate bearing an apical process.
description: Published as part of Serbina, Liliya & Burckhardt, Daniel, 2017, Systematics, biogeography and host-plant relationships of the Neotropical jumping plant-louse genus Russelliana (Hemiptera: Psylloidea), pp. 1-114 in Zootaxa 4266 (1) on pages 26-27, DOI: 10.5281/zenodo.575325