Systematics, biogeography and host-plant relationships of the Neotropical jumping plant-louse genus Russelliana (Hemiptera: Psylloidea) Author Serbina, Liliya Author Burckhardt, Daniel text Zootaxa 2017 4266 1 1 114 journal article 33062 10.5281/zenodo.575325 f4033cfe-28b4-434e-a577-bf51193b4df6 1175-5326 575325 6202B24C-50CC-4EF1-A54E-8BAD122606DD Russelliana adela sp. nov. ( Figs 8 A, 11A, 16A, 21A, 26A, 30A) Material examined. Holotype ♂ : Chile : V Region , Province Los Andes , El Juncal , 2200 m , 24.xii.1998 , Asteraceae , alpine scrub with low bushes ( D. Burckhardt ) #6(4) ( NHMB , dry). Paratypes : Chile : 2 ♂ , 11 ♀ , V Region , Province Los Andes , Río Blanco to Portillo , route 60, Aconcagua Valley , 32°50'S 70°08'W , 2200–2400 m , 23.xi.1992 , Nardophyllum cf. lanatum , alpine scrub ( D. Burckhardt ) #12 ( NHMB , dry) ; 9 ♀, same but Mulguraea scoparia [ Diostea scoparia ] (D. Burckhardt) #12 (NHMB, dry); 11 ♂ , 13 ♀ , 3 immatures, same but Portillo , 32°50'S 70°08'W , 2200 m , 31.xii.1993 ,? Baccharis sp. ( D. Burckhardt ) #44 ( MHNG , NHMB , dry) ; 4 ♂ , 4 ♀ , same but km 14 Portillo to Río Blanco , 2100 m , 23.xii.1995 , Lycium sp., subalpine scrub ( D. Burckhardt ) #19(4) ( MHNG , NHMB , dry) ; 10 ♂ , 10 ♀ , 9 immatures, same but km 10 Portillo to Río Blanco , 2300 m , Lycium sp., alpine scrub ( D. Burckhardt ) #18(4) ( MHNG , dry, on slide, 70 % ethanol) ; 26 ♂, 39 ♀, 3 immatures, same as holotype (D. Burckhardt) #6(4) (NHMB, dry, on slide, 70 % ethanol); 9 ♂ , 13 ♀ , 1?, same but Province San Felipe de Aconcagua , km 20 Resguardo de Los Patos to Paso del Rubio , 2200–2300 m , 1.i.1999 , Asteraceae , semidesert and subalpine scrub ( D. Burckhardt ) #12(1) ( BMNH , NHMB , dry, on slide, 70 % ethanol). Description. Coloration. Head including genal processes yellow to green-yellow; clypeus black. Eyes yellow to brown, ocelli red. Antenna yellow to brownish, segments 3–8 with dark brown apices, segments 9–10 entirely dark brown. Pronotum pale yellow; mesopraescutum pale yellow to yellow, sometimes with two distinct yellow to orange patches along the fore margin; mesoscutum pale yellow to yellow, sometimes with distinct four broad and, in the middle, one narrow yellow longitudinal stripes; mesoscutellum pale yellow along the margin, yellow to green-yellow in the middle. Metanotum yellow to green-yellow. Forewing with pale yellow veins and colourless membrane, sometimes yellowish in apical part. Legs yellow to orange, sometimes distal tarsal segments darker, meracanthus of metacoxa yellow. Abdomen yellow to brown, sometimes slightly ligther ventrally; terminalia yellow. Female terminalia with dark apex. Structure. Head, in profile, strongly inclined from longitudinal body axis at 90°. Vertex subtrapezoidal 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 conical, slender, acute apically, slightly shorter than vertex, covered with moderately long setae. Pronotum with one pronounced lateral and one relatively shallow sublateral tubercles on either side. Forewing oblong-oval, narrowly, evenly rounded apically; vein C+Sc weakly curved, pterostigma long, vein Rs weakly sinuous, slightly curved to fore margin apically; vein M slightly longer than either of veins M1+2 and M3+4; surface spinules faint, present in all cells, leaving narrow spinule-free stripes along the veins, sparsely and irregularly spaced; radular spinules covering triangular areas along the margin of cells r2, m1, m2 and cu1. Metatibia with 6–7 apical spurs. Terminalia. Male. Proctiger tubular; sparsely covered with moderately long setae. Subgenital plate short, subglobular; densely hairy. Paramere narrowly lamellar, irregularly rounded apically; with long hook-shaped apico-anterior process on very short pedicel and lobe with apically sclerotised median tooth; lobe situated exterior to process; outer face covered with moderately long setae mostly in apical half, inner face densely, evenly covered with moderately long setae. Distal segment of aedeagus moderately elongate, weakly expanding towards apex; with short beak-shaped anterior process and one horn-shaped apico-posterior tubercle; lateral lobes moderately long, dilated towards apex which is concave.—Female. Proctiger oblong cuneate, pointed apically; dorsal margin, in profile, almost straight; relatively densely covered with moderately long setae in dorsal part. Subgenital plate cuneate, with short apical process; sparsely covered with moderately long setae, dorsal margin with a row of bristles. Host-plant. Unknown. Adults were collected on Asteraceae :? Baccharis sp., Nardophyllum cf. lanatum (Meyen) Cabrera and an unidentified genus, on Verbenaceae : Mulguraea scoparia (Gillies & Hook.) N.O'Leary & P.Peralta , as well as on Solanaceae : Lycium sp. Immatures were found on? Baccharis sp., Asteraceae indet. and Lycium sp. The material was collected by sweeping and the association with the plants is doubtful. Problematical is also the identification of the plants as several specimens were in poor state. Asteraceae are the most probable hosts. Despite several attempts to find the host in the Río Blanco–Portillo region (1992, 1993, 1995 and 1998 ) no conclusive results were obtained. Distribution. Chile (V Region). Derivation of name. From Greek αδηλος = hidden, secret, unknown, mysterious, etc. for the uncertain host despite several attempts to find it. Comments. Russelliana adela resembles R. bicolorata , intermedia and xantha , in a paramere bearing a long hook-shaped apico-anterior process which is situated interiorly to the lobe, and in a distal segment of the aedeagus bearing a short beak-shaped anterior process and a horn-shaped apico-posterior tubercle. R. adela differs from the three species in a colourless forewing membrane and an oblong cuneate female proctiger with a relatively straight dorsal margin. R. adela differs from R. bicolorata and xantha in a multicoloured body, from R. bicolorata in a shape of the forewing which is broadest in the apical third, and from R. intermedia in the absence of the median hump of the paramere.