Usana rotalarius Long & Huang, 2023

Huang, Xiu-Dong, Yang, Lin, Chen, Xiang-Sheng & Long, Jian-Kun, 2023, Two new species of the planthopper genus Usana Distant, 1906 (Hemiptera, Fulgoromorpha, Achilidae) from China, ZooKeys 1184, pp. 361-375 : 361

Usana rotalarius Long & Huang sp. nov.

Figs 3 , 4 , 15-20 , 24-27 , 30-31 , 32-34

Type materials.

Holotype: China • ♂; Chongqing Municipality, Wuxi County, Yintiaoling National Natural Reserve; 31°27'N, 109°56'E; sweeping, 11 August 2022, W.-J. Cao leg.; IEGU. Paratypes China • 4 ♂; Yintiaoling National Natural Reserve; 31°27'N, 109°56'E; sweeping, 11 August 2022, W.-J. Cao leg.; IEGU.

Diagnosis.

The salient features of this new species different from other species in Usana are as follows: 1) anal segment in lateral view (Fig. 20 ) with nearly right-angle bend from base to end; 2) medioventral process of pygofer in ventral view (Fig. 18 ) entire, apically convex, concave at base; 3) dorsal periandrial lobe in ventral view horseshoe-shaped (Fig. 27 ), inner margin middle with a longitudinal group of teeth, subapical surface in middle gives rise to a short process with its apical margin sharp convex, directed based; 4) inner penis rods elongate, blade-like, curved, apically pointed (Fig. 24 ).

Description.

Body length (from apex of vertex to fore-wing apex): male 5.6-6.1 mm (n = 5); fore-wing length: male 4.8-5.2 mm (n = 5).

Colouration. Generally light, yellowish brown to dark brown (Figs 3 , 4 ). Vertex yellowish brown (Figs 3 , 15 ). Face yellowish brown to dark brown; frons brown dark brown on proximal part; postclypeus yellowish brown (Fig. 16 ). Genae light yellowish brown (Fig. 16 ). Eyes reddish brown, ocellus light yellowish brown (Figs 16 , 17 ). Antenna yellowish brown (Figs 16 , 17 ). Rostrum yellowish brown, with brown end (Fig. 4 ). Pronotum yellowish brown (Figs 3 , 15 ). Mesonotum brown (Figs 3 , 15 ). Tegulae yellowish brown (Fig. 15 ). Tegmen light yellowish brown to dark brown (Figs 3 , 4 , 32 ). Costal area yellowish brown. Postcostal cell light yellowish brown to yellowish brown, with end areas yellowish brown. Radial area light yellowish brown to dark brown; C1 light yellowish brown; C1a yellowish brown; C1' and C1b dark brown. Radial cell light yellowish brown to dark brown; C2 yellowish brown; C2' dark brown. Medial area yellowish brown to dark brown; C3 yellowish brown, with deep-brown ends; C3a and C3' dark brown. Median cell light yellowish brown; C4 yellowish brown with end areas deep brown; C4a and C4' dark brown. Areola postica light yellowish brown to dark brown; C5 base light yellowish brown and end deep brown; C5' dark brown. Cubital cell yellowish brown to deep brown, with base yellowish brown and end deep brown. Basal cell deep brown at end. Area between CuP and postclaval margin light yellowish brown. Tegmen veins yellowish brown. Hind wing pale brown; veins brown. Legs and abdomen light yellowish brown to yellowish brown (Fig. 4 ).

Head and thorax. Vertex not concave, slightly declivous; triangular areolets at lateroapical angles of head distinct; anterior margins carinate; arcus convex forward; lateral margins carinate, relatively straight, and diverging basad; posterior margin broadly concave (Figs 3 , 15 ). Frons slightly convex in lateral view; upper margin (apex) truncate; median carina evident; lateral margin carinate, sinuately diverging to level of antennae, thence gradually incurved to suture (Fig. 16 ). Clypeus with distinct median and lateral carinae (Fig. 16 ). Rostrum just reaching trochanter of hind legs (Fig. 4 ). Antenna nearly cylindrical, not sunken as a depression (Figs 4 , 16 , 17 ). Ocelli separated from eyes (Fig. 17 ). Pronotum with 3 distinct carinae; anterior margin of disk broadly convex; posterior margin obtusely angled, concave at middle, median carina distinct, lateral carinae straight, slightly diverging rearward, attaining hind margin; lateral lobe with a small longitudinal carina between eye and tegula (Figs 3 , 15 ). Mesonotum wider, with 3 obvious, nearly parallel carinae (Figs 3 , 15 ).

Tegmen with costal margin slightly convex; apical margin roundly convex; distinctly concave on postclaval margin (Figs 32 , 33 ). Stem ScP+R+MP short after basal cell before MP fork; stem ScP+R forked at ~1/3 of tegmen length, slightly before CuA fork; Vein ScP+RA with fork clearly before RP fork, with 2 terminals; branch RP with 2 terminals; Vein MP with fork clearly after CuA fork, with 3 terminals; branch CuA with 2 terminals (Figs 32 , 33 ). Hind wing with simple ScP+RA, branch RP vein with 2 terminals, MP with 3 terminals (MP1, MP2 and MP3+4), vein CuA with 2 terminals, vein A2 without blind branches (Fig. 34 ).

Legs. Post-tibiae with a lateral spine at basal 2/5. Metatibia with 7 or 8 apical teeth; rightmost apical teeth obviously larger, arrangement slightly slanting; basimetatarsomere with row of 7 apical teeth, their arrangement in arcuate; midmetarsomere with 6 or 7 apical teeth in U-shaped arrangement; metatibio-tarsal formula 8(7)-7-7 (6) (Fig. 25 ).

Head. Vertex: A/B = 2.4. Frons: C/D = 1.4; D/E = 1.5; F/C = 0.4. Rostrum: G/H = 1.7.

Thorax. Pronotum: I/B = 0.7. Mesonotum: J/I = 8.2; J/B+I = 3.4. Fore-wing: K/L = 3.1. Hind wing: M/N = 2.1.

Male terminalia. Anal segment in dorsal view (Fig. 19 ) with apical margin roundly concave in middle, length ~1.7 times as long as width; anal style not exceeding apex of anal segment. Anal segment in lateral view (Fig. 20 ) with nearly right-angle bending from base to end. Pygofer in lateral view (Fig. 20 ) with dorsal margin distinctly shorter than ventral margin; anterior margin concave and narrowest at 1/3 its length; posterior margin near middle obviously serrated, convex. Medioventral process of pygofer in ventral view (Fig. 18 ) entire, apically convex, concave at base. Genital style slightly narrowing apically, with apex roundly convex, dorsal margin gives rise to 1 sharp process and 1 blunt process; inner surface near anterior margin with a slender, outwardly directed, finger-like process (Figs 18 , 30 , 31 ). Aedeagus structure relatively complex, nested (Figs 26 , 27 ). Aedeagus with phallobase in midline deeply fissure from base to subapex, dorsal lobe in dorsal view (Fig. 26 ) with apical margin sharp convex; ventral periandrial lobe obviously longer than dorsal periandrial lobe. Dorsal periandrial lobe in ventral view horseshoe-shaped (Fig. 27 ), middle of inner margin with a longitudinal group of teeth, subapical surface in middle gives rise to a short process with its tip sharply convex, directed based; left and right lateral periandrial lobes nearly symmetrical, with tips roundly convex. Inner penis rods elongate, blade-like, curved, apically pointed (Fig. 24 ).

Etymology.

The species name is derived from the Latin word " rotalarius ", which refers to the medioventral process of pygofer in ventral view (Fig. 18 ) apically convex.

Host plant.

Unknown.

Distribution.

China (Chongqing).

Figures

Figures 1 - 4. Adult male habitus (dorsal and lateral views) of Usana new species 1, 2 U. tongmaiensis sp. nov. 3, 4 U. rotalarius sp. nov. Scale bars: 1 mm.

Figures 9 - 20. Head, thorax and pygofer of Usana new species 9 - 14 U. tongmaiensis sp. nov., male 15 - 20 U. rotalarius sp. nov., male 9, 15 head and thorax, dorsal view 10, 16 face 11, 17 head, lateral view 12, 18 pygofer and genital style, ventral view 13, 19 anal segment, dorsal view 14, 20 male genitalia, lateral view. Scale bars: 1 mm (9 - 11, 15 - 17); 0.5 mm (12 - 14, 18 - 20).

Figures 21 - 31. Genital, genital style and post tibiae of Usana new species 21 - 23, 28, 29 U. tongmaiensis sp. nov. 24 - 27, 30, 31 U. rotalarius sp. nov. 28, 30 left genital style, inner surface view 29, 31 left genital style, ventral view 21, 26 aedeagus, dorsal view 22, 27 aedeagus, ventral view 23, 24 inner penis rods in dorsal view 25 post tibiae. Scale bars: 0.5 mm.

Figures 32 - 34. Adult male Usana rotalarius sp. nov. 32, 33 fore-wing 34 hind wing. Scale bars: 1 mm.